2MASS All Sky Release

2015-09-15 07:08
Catalog:
2MASS Dataset
Read:
2347

1. Point Source Catalog (PSC)

a. Column Descriptions

The following table contains brief descriptions of the parameters provided for each source in the 2MASS All Sky Release PSC. The table is organized according to the broad function and utility of the parameters: positional information, photometric information, and source quality information. For PSC flag parameters, the meaning of each possible flag value is given, along with some practical information on their usage.

The columns in the following table are:

  • Column Name: The parameter name in the PSC table. Click on this to go to the section of the Explanatory Supplement where the derivation and/or usage of that parameter is described in more detail.


  • Format: The ascii-equivalent format of the field in the PSC, expressed in "C" readable notation. This is useful when parsing the aligned tabular output from IRSA/GATOR. Although the data values will conform to these formats, the actual width of the field in the GATOR output may be padded with extra blank spaces to accommodate column headers. Note that some fields containnull values that will require special handling when parsing PSC tables drawn from either IRSA/GATOR output or the ascii DVD or ftp versions.


  • Units: The units of the parameter. A value of "---" in this column means that the parameter is dimensionless.


  • nulls: A "yes" in this column means that this parameter can be null in the PSC. A "no" means that there will always be a value in this column in the PSC. Note that null values are represented differently in the IRSA/GATOR output and the ascii DVD or ftp versions of the PSC.


  • Description: A brief description of the parameter and its values.


 

Column Name Format Units nulls Description  
Primary Positional Information
ra %10.6f deg no J2000 right ascension with respect to the ICRS  
dec/decl %10.6f deg no J2000 declination with respect to the ICRS  
err_maj %4.2f arcsec no Semi-major axis length of the one sigma position uncertainty ellipse  
err_min %4.2f arcsec no Semi-minor axis length of the one sigma position uncertainty ellipse  
err_ang %3d deg no Position angle on the sky of the semi-major axis of the position uncertainty ellipse (East of North)  
designation %17s --- no Sexagesimal, equatorial position-based source name in the form: hhmmssss+ddmmsss[ABC...]. The full naming convention for 2MASS All-Sky Release PSC sources has the form "2MASS Jhhmmssss+ddmmsss[ABC...]", where "2MASS" indicates that the source is from the All-Sky PSC, "J" indicates the position is J2000, and the optional trailing letters are used to distinguish sources with otherwise duplicate names. The "2MASS J" prefix is not listed explicitly in the designation column.  
Primary Photometric Information
<="" a="">j_m %6.3f mag yes Default J-band magnitude, or if the source is not detected in the J-band, the 95% confidence upper limit derived from a 4" radius aperture measurement taken at the position of the source on the Atlas Image. The origin of the default magnitude is given by the first character of the rd_flg value (rd_flg[1]). This column is null if the source is nominally detected in the J-band, but no useful brightness estimate could be made (rd_flg[1]="9").  
<="" a="">j_cmsig %5.3f mag yes Corrected photometric uncertainty for the default J-band magnitude. If rd_flg[1]="2", this is the measurement error from the profile-fitting procedure,corrected to be consistent with observed repeatability statistics. If rd_flg[1]="1" or "4", this is the RMS of the brightness measured in aperture photometry on the individual frames. If rd_flg="3", the uncertainty is derived from the residuals to the 1-d radial profile fit to the unsaturated wings of the bright star. Ifj_cmsig > 8.0, it is a flag value indicating that a meaningful uncertainty could not be determined for the source. This column is null if the default magnitude is a 95% confidence upper limit (rd_flg[1]="0" or "6") or if the source is not measurable (rd_flg[1]="9").  
<="" a="">j_msigcom %5.3f mag yes Combined, or total photometric uncertainty for the default J-band magnitude. The combined uncertainty is derived from the following relation:

j_msigcom = sqrt(j_cmsig2 + j_zperr2 + fferr2 + [r1normrms2])

where

j_cmsig = Corrected J-band photometric uncertainty
j_zperr = Nightly photometric zero point uncertainty = 0.011 mag
fferr = Flat-fielding residual error = 0.005 mags
r1normrms = R1 normalization uncertainty = 0.012 mags (applied only for sources with rd_flg[1]="1"

This column is null if the default magnitude is a 95% confidence upper limit (i.e. the source is not detected, or inconsistently deblended in the J-band).

 
j_snr %10.1f mag yes J-band "scan" signal-to-noise ratio. This value is given by the ratio of the J-band flux to the characteristic J-band scan noise. The scan noise is the mode of the distribution of flux uncertainties for all point source measurements in a specific 2MASS scan, and is tabulated in the Scan Information Table (NOT YET AVAILABLE). j_snr values are capped at 10000000.0. This column is null if the default magnitude is a 95% confidence upper limit (i.e. the source is not detected, or inconsistently deblended in the J-band).  
<="" a="">h_m %6.3f mag yes Default H-band magnitude, or if the source is not detected in the H-band, the 95% confidence upper limit derived from a 4" radius aperture measurement taken at the position of the source on the Atlas Image. The origin of the default magnitude is given by the second character of the rd_flg value (rd_flg[2]). This column is null if the source is nominally detected in the H-band, but no useful brightness estimate could be made (rd_flg[2]="9").  
<="" a="">h_cmsig %5.3f mag yes Corrected photometric uncertainty for the default H-band magnitude. If rd_flg[2]="2", this is the measurement error from the profile-fitting procedure,corrected to be consistent with observed repeatability statistics. If rd_flg[2]="1" or "4", this is the RMS of the brightness measured in aperture photometry on the individual frames. If rd_flg="3", the uncertainty is derived from the residuals to the 1-d radial profile fit to the unsaturated wings of the bright star. Ifh_cmsig > 8.0, it is a flag value indicating that a meaningful uncertainty could not be determined for the source. This column is null if the default magnitude is a 95% confidence upper limit (rd_flg[2]="0" or "6") or if the source is not measurable (rd_flg[2]="9").  
<="" a="">h_msigcom %5.3f mag yes Combined, or total photometric uncertainty for the default H-band magnitude. The combined uncertainty is derived from the following relation:

h_msigcom = sqrt(h_cmsig2 + h_zperr2 + fferr2 + [r1normrms2])

where

h_cmsig = Corrected H-band photometric uncertainty
h_zperr = Nightly photometric zero point uncertainty = 0.007 mag
fferr = Flat-fielding residual error = 0.005 mags
r1normrms = R1 normalization uncertainty = 0.012 mags (applied only for sources with rd_flg[2]="1"

This column is null if the default magnitude is a 95% confidence upper limit (i.e. the source is not detected, or inconsistently deblended in the H-band).

 
h_snr %10.1f mag yes H-band "scan" signal-to-noise ratio. This value is given by the ratio of the H-band flux to the characteristic H-band scan noise. The scan noise is the mode of the distribution of flux uncertainties for all point source measurements in a specific 2MASS scan, and is tabulated in the Scan Information Table (NOT YET AVAILABLE). h_snr values are capped at 10000000.0. This column is null if the default magnitude is a 95% confidence upper limit (i.e. the source is not detected, or inconsistently deblended in the H-band).  
<="" a="">k_m %6.3f mag yes Default Ks-band magnitude, or if the source is not detected in the Ks-band, the 95% confidence upper limit derived from a 4" radius aperture measurement taken at the position of the source on the Atlas Image. The origin of the default magnitude is given by the third character of the rd_flg value (rd_flg[3]). This column is null if the source is nominally detected in the Ks-band, but no useful brightness estimate could be made (rd_flg[3]="9").  
<="" a="">k_cmsig %5.3f mag yes Corrected photometric uncertainty for the default Ks-band magnitude. If rd_flg[3]="2", this is the measurement error from the profile-fitting procedure,corrected to be consistent with observed repeatability statistics. If rd_flg[3]="1" or "4", this is the RMS of the brightness measured in aperture photometry on the individual frames. If rd_flg="3", the uncertainty is derived from the residuals to the 1-d radial profile fit to the unsaturated wings of the bright star. Ifk_cmsig > 8.0, it is a flag value indicating that a meaningful uncertainty could not be determined for the source. This column is null if the default magnitude is a 95% confidence upper limit (rd_flg[3]="0" or "6") or if the source is not measurable (rd_flg[3]="9").  
<="" a="">k_msigcom %5.3f mag yes Combined, or total photometric uncertainty for the default Ks-band magnitude. The combined uncertainty is derived from the following relation:

k_msigcom = sqrt(k_cmsig2 + k_zperr2 + fferr2 + [r1normrms2])

where

k_cmsig = Corrected Ks-band photometric uncertainty
k_zperr = Nightly photometric zero point uncertainty = 0.007 mag
fferr = Flat-fielding residual error = 0.005 mags
r1normrms = R1 normalization uncertainty = 0.012 mags (applied only for sources with rd_flg[3]="1"

This column is null if the default magnitude is a 95% confidence upper limit (i.e. the source is not detected, or inconsistently deblended in the Ks-band).

 
k_snr %10.1f mag yes Ks-band "scan" signal-to-noise ratio. This value is given by the ratio of the Ks-band flux to the characteristic Ks-band scan noise. The scan noise is the mode of the distribution of flux uncertainties for all point source measurements in a specific 2MASS scan, and is tabulated in the Scan Information Table (NOT YET AVAILABLE). k_snr values are capped at 10000000.0. This column is null if the default magnitude is a 95% confidence upper limit (i.e. the source is not detected, or inconsistently deblended in the Ks-band).  
Primary Source Quality Information
ph_qual %3s --- no

Photometric quality flag. Three character flag, one character per band [JHKs], that provides a summary of the net quality of the default photometry in each band, as derived from the Read Flag (rd_flg), measurement uncertainties ([jhk]_cmsig), scan signal-to-noise ratios ([jhk]_snr), frame-detection statistics (ndet), and profile-fit reduced chi-squared values ([jhk]_psfchi). The value for ph_qual is set for a band according to the precedence of the table below. For example, a source that is tested and meets the conditions for category "X" is not tested for subsequent qualities.

  • "X" - There is a detection at this location, but no valid brightness estimate can be extracted using any algorithm. rd_flg="9" and default magnitude isnull.
  • "U" - Upper limit on magnitude. Source is not detected in this band (rd_flg="0"), or it is detected, but not resolved in a consistent fashion with other bands (rd_flg="6"). A value of ph_qual="U" does not necessarily mean that there is no flux detected in this band at the location. Whether or not flux has been detected can be determined from the value of rd_flg. When rd_flg="0", no flux has been detected. When rd_flg="6", flux has been detected at the location where the images were not deblended consistently in all three bands (JHKs).
  • "F" - This category includes rd_flg="1" or rd_flg="3" sources where a reliable estimate of the photometric error, [jhk]_cmsig, could not be determined. The uncertainties reported for these sources in [jhk]_cmsig and [jhk]_msigcom are flags and have numeric values >8.0.
  • "E" - This category includes detections where the goodness-of-fit quality of the profile-fit photometry was very poor (rd_flg=2 and[jhk]psf_chi>10.0), or detections where psf fit photometry did not converge and an aperture magnitude is reported (rd_flg=4), or detections where the number of frames was too small in relation to the number of frames in which a detection was geometrically possible (rd_flg="1" or rd_flg="2").
  • "A" - Detections in any brightness regime where valid measurements were made (rd_flg="1","2" or "3") with [jhk]_snr>10 AND [jhk]_cmsig<0.10857.
  • "B" - Detections in any brightness regime where valid measurements were made (rd_flg="1","2" or "3") with [jhk]_snr>7 AND [jhk]_cmsig<0.15510.
  • "C" - Detections in any brightness regime where valid measurements were made (rd_flg="1","2" or "3") with [jhk]_snr>5 AND [jhk]_cmsig<0.21714.
  • "D" - Detections in any brightness regime where valid measurements were made (rd_flg="1","2" or "3") with no [jhk]_snr or [jhk]_cmsigrequirement.
 
rd_flg %3s --- no Read flag. Three character flag, one character per band [JHKs], that indicates the origin of the default magnitudes and uncertainties in each band (j_m,h_m,k_mj_cmsigh_cmsigk_cmsig). Rd_flg values of "1", "2" or "3" generally indicate the best quality detections, photometry and astrometry (although other quality flags must be considered). Values of "0", "4", "6" and "9" in a band indicate either non-detections, or generally poor quality photometry and positions. The definitions of the rd_flg values are:
  • "0" - Source is not detected in this band. The default magnitude is the 95% confidence upper limit derived from a 4" radius aperture measurement taken at the position of the source on the Atlas Image. The sky background is estimated in an annular region with inner radius of 14" and outer radius of 20".
  • "1" - The default magnitude is derived from aperture photometry measurements on the 51 ms "Read_1" exposures. The aperture radius is 4", with the sky background measured in an annulus with an inner radius of 14" and an outer radius of 20". Used for sources that saturate one or more of the 1.3s "Read_2" exposures, but are not saturated on at least one of the 51 ms "Read_1" frames.
  • "2" - The default magnitude is derived from a profile-fitting measurement made on the 1.3 sec "Read_2" exposures. The profile-fit magnitudes are normalized to curve-of-growth-corrected aperture magnitudes. This is the most common type in the PSC, and is used for sources that have no saturated pixels in any of the 1.3 sec exposures.
  • "3" - The default magnitude is derived from a 1-d radial profile fitting measurement made on the 51 ms "Read_1" exposures. Used for very bright sources that saturate all of the 51 ms "Read 1" exposures.
  • "4" - The default magnitude is derived from curve-of-growth-corrected 4" radius aperture photometry measurements on the 1.3 s "Read_2" exposures. This is used for sources that are not saturated in any of the Read_2 frames, but where the profile-fitting measurements fail to converge to a solution. These magnitudes are the same as the standard aperture magnitudes (j_m_stdap, h_m_stdap, k_m_stdap), but when they are the default magnitudes, it generally implies that they are low quality measurements.
  • "6" - The default magnitude is the 95% confidence upper limit derived from a 4" radius aperture measurement taken at the position of the source on the Atlas Image. The sky background is estimated in an annular region with inner radius of 14" and outer radius of 20". This is used for pairs of sources which are detected and resolved in another band, but are detected and not resolved in this band. This differs from a rd_flg="0" because in this case there is a detection of the source in this band, but it is not consistently resolved across all bands.
  • "9" - The default magnitude is the 95% confidence upper limit derived from a 4" radius aperture measurement taken at the position of the source on the Atlas Image. The sky background is estimated in an annular region with inner radius of 14" and outer radius of 20". This is used for sources that were nominally detected in this band, but which could not have a useful brightness measurement from either profile fitting or aperture photometry. This often occurs in highly confused regions, or very near Tile edges where a significant fraction of the measurement aperture of sky annulus falls off the focal plane.
 
bl_flg %3s --- no Blend flag. Three character flag, one character per band [JHKs], that indicates the number of components that were fit simultaneously when estimating the brightness of a source: 

  • "0" - Source is not detected, or is inconsistently deblended in that band.
  • "1" - One component was fit to the source in R_2 profile-fitting photometry (rd_flg="2"), or default magnitudes are from aperture photometry (rd_flg="1" or "4") or saturated star 1-d radial profile-fitting (rd_flg="3").
  • ">1" - More than one component was fit simultaneously during R2 profile-fit photometry, where the value of the field is the number of components simultaneously fit. The maximum number of components is 7 in any band for the PSC, so this bl_flg is always a three character flag. Multi-component fitting occurs only for profile-fitting, and only when more than one detection is found within ~5". Single detections that are not well-fit by a single PSF are not split.
 
cc_flg %3s --- no Contamination and confusion flag. Three character flag, one character per band [JHKs], that indicates that the photometry and/or position measurements of a source may be contaminated or biased due to proximity to an image artifact or nearby source of equal or greater brightness. The cc_flg in each band is set in hierarchical order according to the following table, in the event a source is affected by more than one artifact or condition:

  • "p" = Persistence. Source may be contaminated by a latent image left by a nearby bright star.
  • "c" = Photometric Confusion. Source photometry is biased by a nearby star that has contaminated the background estimation. This is very common in high source density regions.
  • "d" = Diffraction spike confusion. Source may be contaminated by a diffraction spike from a nearby star.
  • "s" = Electronic stripe. Source measurement may be contaminated by a stripe from a nearby bright star.
  • "b" = Bandmerge confusion. In the process of merging detections in the different bands for this source, there was more than one possible match between the different band components. This occurs in regions of very high source density, or when multiple sources were split in one band but not another.
  • "0" = Source is unaffected by known artifacts, or is not detected in the band.

Non-zero values the cc_flg in any band is an indicator that the measurements of that source may be contaminated.

 
ndet %6s --- no Frame detection statistics. A six-character flag, two characters per band [JJHHKsKs], that indicates the number frames on which a source was detected, N, and the number of frames on which the source could have been measured, M. The first digit in the pair for each band, N, gives the number of frames on which there were >3 sigma aperture photometry detections of the source. The second digit for each band, M, gives the number of frames on which aperture measurements were possible. Normally, M=6, (occasionally M=7 because the scanning step size was slightly less than 1/6 of the frame size). M can be <6 if frames are "lost" because: a) there were masked pixels within the source aperture due to cosmic ray detections, noisy pixels, meteor trails, etc, or b) there were saturated pixels within the source aperture. Values of M < 6 are not uncommon, but do indicate an effective loss of coverage and sensitivity for a source.

The values of N and M for a band always pertain to the aperture photometry on the 51 ms "Read_1" exposures if rd_flg="1", and to the aperture photometry on the 1.3 s "Read_2" exposures if rd_flg="2" or "4". Sources that are saturated on all of the Read_1 frames (rd_flg="3") have N=0 because no aperture photometry was possible.

Sources with signal-to-noise ratios >8-9 should be detected on all available frames. Values of N < M for such sources are an indication of possible loss of measurement integrity. Values of N < M, or even N=0, are normal for fainter sources because they are too faint on individual frames to yield a >3 sigma detection.

 
prox %5.1f arcsec no Proximity. The distance between this source and its nearest neighbor in the PSC. The pts_key of the nearest source is given in the pxcntr column. The effective resolution of the 2MASS system is approximately 5". Any source with prox < 6" is potentially confused with a nearby object, and should be used with caution.  
pxpa %3d deg yes The position angle on the sky of the vector from the source to the nearest neighbor in the PSC, in degrees East of North. This column in null if prox=0.0, which occurs only for confused sources or from errors in the bandmerge process caused by confusion.  
pxcntr %10d --- no The pts_key value of the nearest source in the PSC.  
gal_contam %1d --- no Extended source "contamination" flag. A value of gal_contam="2" indicates that this point source falls within the elliptical boundary of an XSC source defined by the semi-major axis and ellipticity of the 20 mag arcsec-2 Ks-band elliptical isophote (r_k20fe) +10%, for XSC sources where r_k20fe is >10''. Sources so indicated are often foreground stars superimposed on background galaxies, or sometimes extractions of pieces of the galaxy or nebula. The point source photometry for these sources is probably contaminated by the surrounding structured extended emission. Point sources can still be superimposed on extended sources and remain unflagged if the XSC source shape is not well-described by an ellipse.

This flag also denotes (gal_contam="1") PSC sources that are equivalent to sources in the XSC, but only for XSC sources with r_k20fe is >10''. Since most XSC sources have semi-major axes <10'', gal_contam does not identify all PSC sources with exact XSC counterparts. Use the ext_key to identify all PSC sources that were found to be resolved relative to a single point-spread function..

  • "0" - Source does not fall within the elliptical profile of an extended source with semi-major axis >10'', or it is not identified exactly with an XSC source with semi-major axis >10''. However, the source may correspond exactly to a smaller XSC source.
  • "1" - Source is resolved by 2MASS, and is equivalent to a source in the XSC that has a semi-major axis >10'' in size. Users must refer to the ext_keyto identify all PSC sources with XSC counterparts.
  • "2" - Source falls within the elliptical boundary of an XSC source that has a semi-major axis >10'' in size.
 
mp_flg %1d --- no Minor Planet Flag. Indicates if this source is associated with the predicted position of a known minor planet, comet, planet or planetary satellite. This association does not guarantee that the PSC source is a detection of the solar system object. 

 
Additional Positional and Identification Information
pts_key/cntr %10d --- no A unique identification number for the PSC source. This column is called pts_key in the DVD and ftp versions of the PSC and cntr in the IRSA/GATOR version. This sequential number was defined when source records from final data processing were loaded into the Point Source Working DatabasePts_key is incremented in order (or reverse order depending on the scan direction) of declination within a scan. For this reason, on average sources with close pts_keyvalues are close to each other on the sky, except at Tile boundaries. Pts_key ordering thus provides a useful mapping of the 2MASS release on storage media. PSC sources are cross-referenced in the XSCKnown Asteroid Detection ListKnown Comet Detection List, and Planet and Planetary Satellite Detection List via the value of pts_key.  
hemis %1s --- no Hemisphere code for the 2MASS Observatory from which this source was observed.
  • "n" = North/Mt. Hopkins
  • "s" = South/CTIO
 
date %10s yyyy-mm-dd no The observation reference date for this source expressed in ISO standard format. This is the UT day value at sunrise for the night on which the source was observed. Because it is possible for the UT day to change during a night of observations, the actual UT date for a source measurement can differ from date by one day. Use the Julian Day value (jdate) for a more accurate determination of the observation time of the source.  
scan %3d --- no The nightly scan number in which the source was detected.  
glon %7.3f deg no Galactic longitude. Galactic coordinate for 2MASS source derived by precessing reconstructed ra and dec to B1950, and performing rotational transformation into lII, bII coordinate system. This coordinate should not be used as an astrometric reference because it has been rounded to 0.001 deg.
glat %7.3f deg no Galactic latitude. Galactic coordinate for 2MASS source derived by precessing reconstructed ra and dec to B1950, and performing rotational transformation into lII, bII coordinate system. This coordinate should not be used as an astrometric reference because it has been rounded to 0.001 deg.
x_scan %6.1f arcsec no Mean cross-scan focal plane position of the source in the Universal scan (U-scan) coordinate system. This is the approximate distance a source lies west or east of the focal plane centerline. Positive values of x_scan indicate that the source falls west of the centerline and negative values indicate the source is east of the centerline. The focal plane position is approximate because it is derived from the mean position of the source detected on up to seven different frames and three different bands. The U-scan coordinate system combines the pixels from the three arrays from each camera, and follows the near-great-circle path of the scan across the sky. The x_scan value is useful for identifying sources that may be caused or affected by hot pixel events.  
jdate %12.4f day no The Julian Date of the source measurement accurate to +30 seconds. This value is extrapolated from the start time of the Survey scan using the difference between the declinations of the source and the first row in the Tile divided by the scanning rate of the telescope (approximately 57"/sec). The scanning rate of the two 2MASS telescopes was slightly different because of the need to optimize the dithering of images on the arrays.  
Additional Photometric Information
j_psfchi %6.2f --- yes Reduced chi-squared goodness-of-fit value for the J-band profile-fit photometry made on the 1.3 s "Read_2" exposures. Unresolved sources that are well-fit by a single PSF should have j_psfchi~1.0. Values >2 indicate that the source was not well-fit by a single PSF and that the profile-fitting measurement may not accurately capture the flux of the object. This can occur if the source is resolved, part of a multiple star group, or is corrupted by a cosmic ray or hot pixel event.

The j_psfchi value is useful as an indicator of photometric quality only if rd_flg[1]="2" for the source, indicating that the default J magnitude (j_m) is from a profile-fitting measurement. A non-null value for j_psfchi may be listed for sources that have rd_flg[1]="1". However, these are the goodness-of-fits made on saturated star images on the "Read_2" exposures, and do not relate to the aperture photometry magnitude reported in j_m in these cases.

This field is null for rd_flg[1]="0","3","4","6" or "9".

 
h_psfchi %6.2f --- yes Reduced chi-squared goodness-of-fit value for the H-band profile-fit photometry made on the 1.3 s "Read_2" exposures. Unresolved sources that are well-fit by a single PSF should have h_psfchi~1.0. Values >2 indicate that the source was not well-fit by a single PSF and that the profile-fitting measurement may not accurately capture the flux of the object. This can occur if the source is resolved, part of a multiple star group, or is corrupted by a cosmic ray or hot pixel event.

The h_psfchi value is useful as an indicator of photometric quality only if rd_flg[2]="2" for the source, indicating that the default H magnitude (h_m) is from a profile-fitting measurement. A non-null value for h_psfchi may be listed for sources that have rd_flg[2]="1". However, these are the goodness-of-fits made on saturated star images on the "Read_2" exposures, and do not relate to the aperture photometry magnitude reported in h_m in these cases.

This field is null for rd_flg[2]="0","3","4","6" or "9".

 
k_psfchi %6.2f --- yes Reduced chi-squared goodness-of-fit value for the Ks-band profile-fit photometry made on the 1.3 s "Read_2" exposures. Unresolved sources that are well-fit by a single PSF should have k_psfchi~1.0. Values >2 indicate that the source was not well-fit by a single PSF and that the profile-fitting measurement may not accurately capture the flux of the object. This can occur if the source is resolved, part of a multiple star group, or is corrupted by a cosmic ray or hot pixel event.

The k_psfchi value is useful as an indicator of photometric quality only if rd_flg[3]="2" for the source, indicating that the default J magnitude (k_m) is from a profile-fitting measurement. A non-null value for k_psfchi may be listed for sources that have rd_flg[3]="1". However, these are the goodness-of-fits made on saturated star images on the "Read_2" exposures, and do not relate to the aperture photometry magnitude reported in k_m in these cases.

This field is null for rd_flg[3]="0","3","4","6" or "9".

 
j_m_stdap %6.3f mag yes J-band "standard" aperture magnitude. This is the curve-of-growth corrected average brightness measured in a 4" radius aperture centered on the source position on each of the available 1.3 s "Read_2" frames. The background sky reference on each frame is measured in an annular region with inner radius of 14" and outer radius of 20". Non-detections on individual frames are included in the average so that the flux is not statistically overestimated. The curve-of-growth correction adjusts to an "infinite" aperture using a normalization value derived from a series of multi-aperture measurements made from many stars having the same seeing FWHM as the source that is corrected. The amplitude of the correction is tabulated in the j_ap_cor value in the Atlas Image Data Table (NOT YET AVAILABLE).

This column can contain a measurement even if the default magnitude is from the 51 ms "Read_1" exposures (rd_flg="1"). In this case, the value is the aperture measurement from the available non-saturated 1.3 s "Read_2" exposures.

This column is null if the source is not detected in the J-band (rd_flg[1]="0"), or if it is saturated in all of the 1.3 s "Read 2" J-band exposures.

 
j_msig_stdap %5.3f mag yes Uncertainty in the J-band standard aperture magnitude. If there was more than one 1.3 s "Read_2" frame available for aperture photometry, this the RMS residual of the brightness measured on the individual frames. If there was only one frame available, this is the uncertainty derived from the single measurement using the poisson statistics of the fluxes in the aperture and sky annulus.

This column is null if the source is not detected in the J-band (rd_flg[1]="0"), or if it is saturated in all of the 1.3 s "Read 2" J-band exposures.

 
h_m_stdap %6.3f mag yes H-band "standard" aperture magnitude. This is the curve-of-growth corrected average brightness measured in a 4" radius aperture centered on the source position on each of the available 1.3 s "Read_2" frames. The background sky reference on each frame is measured in an annular region with inner radius of 14" and outer radius of 20". Non-detections on individual frames are included in the average so that the flux is not statistically overestimated. The curve-of-growth correction adjusts to an "infinite" aperture using a normalization value derived from a series of multi-aperture measurements made from many stars having the same seeing FWHM as the source that is corrected. The amplitude of the correction is tabulated in the h_ap_cor value in the Atlas Image Data Table (NOT YET AVAILABLE).

This column can contain a measurement even if the default magnitude is from the 51 ms "Read_1" exposures (rd_flg="1"). In this case, the value is the aperture measurement from the available non-saturated 1.3 s "Read_2" exposures.

This column is null if the source is not detected in the H-band (rd_flg[1]="0"), or if it is saturated in all of the 1.3 s "Read 2" H-band exposures.

 
h_msig_stdap %5.3f mag yes Uncertainty in the H-band standard aperture magnitude. If there was more than one 1.3 s "Read_2" frame available for aperture photometry, this the RMS residual of the brightness measured on the individual frames. If there was only one frame available, this is the uncertainty derived from the single measurement using the poisson statistics of the fluxes in the aperture and sky annulus.

This column is null if the source is not detected in the H-band (rd_flg[2]="0"), or if it is saturated in all of the 1.3 s "Read 2" H-band exposures.

 
k_m_stdap %6.3f mag yes Ks-band "standard" aperture magnitude. This is the curve-of-growth corrected average brightness measured in a 4" radius aperture centered on the source position on each of the available 1.3 s "Read_2" frames. The background sky reference on each frame is measured in an annular region with inner radius of 14" and outer radius of 20". Non-detections on individual frames are included in the average so that the flux is not statistically overestimated. The curve-of-growth correction adjusts to an "infinite" aperture using a normalization value derived from a series of multi-aperture measurements made from many stars having the same seeing FWHM as the source that is corrected. The amplitude of the correction is tabulated in the k_ap_cor value in the Atlas Image Data Table (NOT YET AVAILABLE).

This column can contain a measurement even if the default magnitude is from the 51 ms "Read_1" exposures (rd_flg="1"). In this case, the value is the aperture measurement from the available non-saturated 1.3 s "Read_2" exposures.

This column is null if the source is not detected in the Ks-band (rd_flg[1]="0"), or if it is saturated in all of the 1.3 s "Read 2" Ks-band exposures.

 
k_msig_stdap %5.3f mag yes Uncertainty in the Ks-band standard aperture magnitude. If there was more than one 1.3 s "Read_2" frame available for aperture photometry, this the RMS residual of the brightness measured on the individual frames. If there was only one frame available, this is the uncertainty derived from the single measurement using the poisson statistics of the fluxes in the aperture and sky annulus.

This column is null if the source is not detected in the Ks-band (rd_flg[3]="0"), or if it is saturated in all of the 1.3 s "Read 2" Ks-band exposures.

 
Additional Source Quality Information
dist_edge_ns %5d arcsec no The distance from the source to the nearest North or South scan edge. The scan edge is defined by the great-circle interpolation between the 3-band coverage corners. The equatorial coordinates of the 3-band coverage corners are given in the Scan Information Table (NOT YET AVAILABLE), referenced by thescan_key. The first character of the dist_edge_flg indicates to which edge the source is closer.  
dist_edge_ew %3d arcsec no The distance from the source to the nearest East or West scan edge. The scan edge is defined by the great-circle interpolation between the 3-band coverage corners. The equatorial coordinates of the 3-band coverage corners are given in the Scan Information Table (NOT YET AVAILABLE), referenced by thescan_key. The second character of the dist_edge_flg indicates to which edge the source is closer.  
dist_edge_flg %2s --- no Two character flag that specifies to which scan edges a source lies closest, and to which edges the dist_edge_ns and dist_edge_ew values refer. The first character encodes the N/S edge: "n" means that dist_edge_ns refers to north scan edge, "s" means that dist_edge_ns refers to the south scan edge. The second character encodes the E/W edge: "e" means that dist_edge_ew refers to the east scan edge, "w" means that dist_edge_ew refers to the west scan edge.  
dup_src %1d --- no Duplicate source flag. Used in conjunction with the use_src flag, this numerical flag indicates whether the source falls in a Tile overlap region, and if so, if it was detected multiple times.

  • "0" = The source does not fall within a Tile overlap region (use_src="1"), or it falls in an overlap region and there were no sources detected within 2" of its position in the overlapping Tile (use_src="0").
  • "1" = The source falls within a Tile overlap region, and there is one source detected within 2" of its position in the overlapping Tile.
  • ">1" = The source falls within a Tile overlap region, and there are multiple sources detected within 2" of its position in the overlapping Tile, and/or within its own Tile. This implies confusion in the multiple source resolution procedure.
 
use_src %1d --- no Use source flag. Used in conjunction with the dup_src flag, this numerical flag indicates if a source falls within a Tile overlap region, and whether or not it satisfies the unbiased selection rules for multiple source resolution.

  • "1" = The source does not fall in a Tile overlap region (dup_src="0"), or it falls in an overlap region, but lies farther from its scan edge than any apparition of the source in another Tile. A source must have use_src="1" to be considered part of the sub-Catalog that satisfies the 2MASS Level 1 Science Requirements
  • "0" = The source falls in a Tile overlap region, but does not have a detection within 2" of its position in any overlapping Tiles. PSC sources withuse_src="0" will always have dup_src="0". Such objects are usually faint, and thus toggling above and below the detection limits, or may have moved between the scans of the different Tiles.
 
Optical Source Association Information
a %1s --- no Catalog identifier of an optical source from either the Tycho 2 or USNO-A2.0 catalog that falls within ~5" of the 2MASS source position. An association with Tycho 2 takes precedence over USNO-A2.0. The values of this column can be:

  • "0" = no optical source positionally associated with 2MASS source
  • "T" = Tycho 2 catalog source positionally associated with 2MASS source
  • "U" = USNO-A2.0 catalog source positionally associated with 2MASS source

Positional association between the 2MASS PSC source and an optical catalog source does not guarantee an identification. Users should consider theseparation between the sources, the number of possible optical matches, and consider proper motion when assessing optical counterparts to 2MASS sources.

The optical association information is unreliable for sources with |dec|>86° because of an error in the 2MASS/USNO-A2.0 position correlation procedure that caused associations to be missed in the vicinity of the equatorial poles. If the source has |dec|>86°, a value of a="0" does not necessarily mean that there is not an optical association within 5´´ of the 2MASS position.

 
dist_opt %3.1f arcsec yes Distance separating 2MASS source position and associated optical source within 5". For Tycho 2 associations (a="T"), the separation is computed for the position of the Tycho 2 source corrected for proper motion to the time of the 2MASS observation (if proper motions are provided in Tycho 2). This column isnull if there is no associated optical source (a="0").  
phi_opt %4d deg yes Position angle on the sky of the vector from the the associated optical source to the 2MASS source position, in degrees East of North. This is opposite to the sense of prox which is the vector from the 2MASS source position to the nearest neighbor in the PSC. This column is null if there is no associated optical source (a="0").  
b_m_opt %5.2f mag yes Blue magnitude of associated optical source. If Tycho 2 (a="T"), then this is the Johnson B magnitude (BJ, derived from BTycho and VTycho using the transformations given in Høg (2000): BJ-VJ = 0.85*(BT-VT). If USNO-A2.0 (a="U"), then this is the photographic blue magnitude. This column is null if there is no associated optical source (a="0").  
vr_m_opt %5.2f mag yes Visual or red magnitude of the associated optical source. If Tycho 2 (a="T"), then this is the Johnson V magnitude (VJ), derived from BTycho and VTychousing the transformations given in Høg (2000): VJ = VT - 0.09*(BT-VT). If USNO-A2.0 (a="U"), then this is the photographic red magnitude. This column isnull if there is no associated optical source (a="0").  
nopt_mchs %1d --- no The number of USNO-A2.0 or Tycho 2 optical sources found within a 5" radius of the 2MASS position.

The optical association information is unreliable for sources with |dec|>86° because of an error in the 2MASS/USNO-A2.0 position correlation procedure that caused associations to be missed in the vicinity of the equatorial poles. If the source has |dec|>86°, a value of nopt_mchs=0 does not necessarily mean that there is not an optical association within 5´´ of the 2MASS position.

 
Cross-Index Information
ext_key %7d --- yes Unique identification number of the record in the XSC that corresponds to this point source. The XSC record with this ext_key value will have the pts_key for this source in its pts_key column. This allows easy cross-referencing between the two catalogs.  
scan_key %5d ---- no Unique identification number of the record in the Scan Information Table (NOT YET AVAILABLE) that corresponds to the survey scan in which this source was detected.  
coadd_key %7d ---- no Unique identification number of the record in the Atlas Image Data Table (NOT YET AVAILABLE) that corresponds to Image in which the position of this source falls.  
coadd %3d ---- no Sequence number of the Atlas Image in which the position of this source falls. The Image sequence number is number of the frame that is nearest the center of the Image.  

 

2. Scan Information Table

a. Scan Information Table Format

The following table contains brief descriptions of the parameters in the Scan Information Table, which provides basic data for each scan in the 2MASS All Sky Release. The table is organized according to the broad function and utility of the parameters: positional information, photometric information, source detection statistics, etc.

The columns in the following table are:

  • Column Name: The parameter name in the Scan Information Table. Click on this to go to the section of the Explanatory Supplement where the derivation and/or usage of that parameter is described in detail.


  • Format: The "C" format of the field in the Scan Information Table. Note that some fields contain null values that will require special handling when parsing the table drawn from either theIRSA/GATOR output or the ascii DVD or ftp versions.


  • Units: The units of the parameter. A value of "---" in this column means that the parameter is dimensionless.


  • nulls: A "yes" in this column means that this parameter can be null in the Scan Information Table. A "no" means that there will always be a value in this column in the Scan Information Table. Note that null values are represented differently in the IRSA/GATOR output and the ascii DVD or ftp versions.


  • Description: A brief description of the parameter and its values.


 

TABLE 1: Description of Fields in the Scan Information Table
Column Name Format Units nulls Description
Primary Information
scan_key/cntr %5d --- no The unique identification number for this scan. This column is called scan_key in the DVD and ftp versions of the Scan Information Table and cntr in the IRSA/GATOR version.
hemis %1s --- no Observatory from which data were obtained:
  • "n" = north = Mt. Hopkins
  • "s" = south = Cerro Tololo.
date %10s yyyy-mm-dd no The observation reference date for this scan expressed in ISO standard format. This is the UT date at sunrise for the night on which the scan was observed. Because it is possible for the UT date to change during a night of observations, the actual UT date for a source can differ from date by one day. Use the Julian Date (jdate) for a more accurate determination of the observation time of the scan.
scan %3d --- no Scan number (unique within date).
tile %6d --- no Tile identification number.
Positional Information
ra %10.6f deg no Right ascension of scan center for equinox J2000; this is computed from the interior corners ra_[1,2,3,4] and dec_[1,2,3,4] (see below).
dec/decl %10.6f deg no Declination of scan center for equinox J2000; this is computed from the interior corners ra_[1,2,3,4] and dec_[1,2,3,4] (see below). This column is called declon the DVD versions of the Scan Information Table and dec in the IRSA/GATOR version.
glon %7.3f deg no Galactic longitude of scan center, as computed from ra and dec above. Galactic coordinates are derived by precessing reconstructed ra and dec to B1950, and performing rotational transformation into the lII, bII coordinate system.
glat %7.3f deg no Galactic latitude of scan center, as computed from ra and dec above. Galactic coordinates are derived by precessing reconstructed ra and dec to B1950, and performing rotational transformation into the lII, bII coordinate system.
ra_1 %10.6f deg no J2000 right ascension of the eastern corner at start of scan. This is the corner fully covered by all three bands.
dec_1 %10.6f deg no J2000 declination of the eastern corner at start of scan. This is the corner fully covered by all three bands.
ra_2 %10.6f deg no J2000 right ascension of the western corner at start of scan. This is the corner fully covered by all three bands.
dec_2 %10.6f deg no J2000 declination of the western corner at start of scan. This is the corner fully covered by all three bands.
ra_3 %10.6f deg no J2000 right ascension of the eastern corner at end of scan. This is the corner fully covered by all three bands.
dec_3 %10.6f deg no J2000 declination of the eastern corner at end of scan. This is the corner fully covered by all three bands.
ra_4 %10.6f deg no J2000 right ascension of the western corner at end of scan. This is the corner fully covered by all three bands.
dec_4 %10.6f deg no J2000 declination of the western corner at end of scan. This is the corner fully covered by all three bands.
General Information
sd %1s --- no Scanning direction:
  • "n" = north-going
  • "s" = south-going.
qual %2d --- no Quality score for scan:
  • "10" is highest grade
  • "0" is lowest.
hgl %1d --- no Special flag indicating whether or not this scan has a single-frame H-band or J-band electronic glitch:
  • "0" indicates no glitch
  • "1" indicates glitch.
cld %1d --- no Special flag indicating whether or not a cloud was found in the scan after comparison of its photometry to that of overlapping scans in the database:
  • "0" indicates no evidence for clouds
  • "1" indicates clouds.
xph %1d --- no Special flag indicating whether or not another photometric problem, not obviously cloud related, was found in the scan after comparing its photometry to that of overlapping scans:
  • "0" indicates no problem
  • "1" indicates compromised photometry.
anom %1d --- no Special flag indicating whether or not an unusual problem was found in the Atlas Images for this scan. Such problem include, but are not limited to, residual meteor trails, satellite trails, insect trails, and unusual reflections or glints from bright stars:
  • "0" indicates no such problem
  • "1" indicates an anomaly.
Time of Observation
ut %9.6f hr no Universal Time (UT) at beginning of scan.
jdate %12.4f day no Julian Date at beginning of scan.
Telescope and Instrument Fields
airm %4.2f --- no Airmass at beginning of scan.
zd %4.1f deg no Scan's distance from the zenith at beginning of scan.
ha %9.6f hr no Hour angle at beginning of scan.
rh %2d % no Relative humidity of telescope enclosure at beginning of scan.
air_temp %4.1f deg C no Air temperature at beginning of scan.
tel_temp %4.1f deg C no Telescope girdle temperature at beginning of scan. This temperature was used to adjust telescope focus to compensate for variations with temperature.
focus %5d --- no Focus setting of telescope at beginning of scan. This is a measure of the position of the focus mechanism, in units of 1.25 microns, relative to a reference position. This reference position changed each time the telescope was collimated.
hry %1d --- no Flag indicating the H-band array configuration for the camera:
  • "0" indicates the original configuration
  • "1" indicates the new (modified) configuration.
For the southern camera, the array configuration was never changed, so this flag is always "0". For the northern camera a new H-band array, first used on 13 Sep 1999 (UT), was installed in mid-survey. Before this date the flag is "0" and on or after this date it is "1".
c_strat %1d --- no Flag indicating the calibration strategy for this night's data:
  • "0" indicates original strategy in which two calibration fields were observed after every two-hour segment of regular survey scans
  • "1" indicates new strategy in which one calibration field was observed after every hour's segment of regular survey scans.
For data taken from the southern hemisphere, this flag is always "1". For data taken from the northern hemisphere this flag is set to "0" on dates before 11 Oct 1997 (UT), and to "1" for dates of 11 Oct 1997 (UT) or thereafter.
Photometric Information
j_zp_ap %7.4f mag no Photometric zero-point for J-band aperture photometry.
h_zp_ap %7.4f mag no Photometric zero-point for H-band aperture photometry.
k_zp_ap %7.4f mag no Photometric zero-point for Ks-band aperture photometry.
h_zperr_ap %6.4f mag no RMS-error of zero-point for H-band aperture photometry
k_zperr_ap %6.4f mag no RMS-error of zero-point for Ks-band aperture photometry
Source Detection Statistics
j_n_snr10 %6d --- no Number of point sources at J-band with SNR>10 (instrumental mag <=15.8)
h_n_snr10 %6d --- no Number of point sources at H-band with SNR>10 (instrumental mag <=15.1)
k_n_snr10 %6d --- no Number of point sources at Ks-band with SNR>10 (instrumental mag <=14.3)
n_ext %3d --- no Number of regular extended sources detected in scan.
Seeing Statistics
j_shape_avg %5.3f --- no J-band average seeing shape for scan. The seeing full-width at half maximum (in arcseconds) can be obtained from the approximate relation FWHM(arcseconds) = 3.13*(j_shape_avg) - 0.46.
h_shape_avg %5.3f --- no H-band average seeing shape for scan. The seeing full-width at half maximum (in arcseconds) can be obtained from the approximate relationFWHM(arcseconds) = 3.13*(h_shape_avg) - 0.46.
k_shape_avg %5.3f --- no Ks-band average seeing shape for scan. The seeing full-width at half maximum (in arcseconds) can be obtained from the approximate relationFWHM(arcseconds) = 3.13*(k_shape_avg) - 0.46.
j_shape_rms %5.3f --- no RMS-error of J-band average seeing shape.
h_shape_rms %5.3f --- no RMS-error of H-band average seeing shape.
k_shape_rms %5.3f --- no RMS-error of Ks-band average seeing shape.
j_2mrat %5.3f --- no J-band average 2nd image moment ratio.
h_2mrat %5.3f --- no H-band average 2nd image moment ratio.
k_2mrat %5.3f --- no Ks-band average 2nd image moment ratio.
Sensitivity Statistics
j_psp %6.3f --- no J-band photometric sensitivity paramater (PSP).
h_psp %6.3f --- no H-band photometric sensitivity parameter (PSP).
k_psp %6.3f --- no Ks-band photometric sensitivity parameter (PSP).
j_pts_noise %7.3f --- no The base-10 logarithm of the characteristic J-band point source scan noise, in units of log(mJy). This is the mode of the distribution of the noise-equivalent flux densities for all J-band R2-R1 detections in the scan. The noise-equivalent flux density for each detection is given by 1603x103(mJy)*1.0857/sigma_m, where sigma_m is the photometric uncertainty, in magnitudes, before correction. 1603x103 mJy was a preliminary estimate of the J-band flux-for-zero-magnitude, and it differs slightly from the final estimate of 1592x103 mJy that is described in VI.4.a. To adjust the given value of j_pts_noise for the final calibration, subtract 0.0030.
h_pts_noise %7.3f --- no The base-10 logarithm of the characteristic H-band point source scan noise, in units of log(mJy). This is the mode of the distribution of the noise-equivalent flux densities for all H-band R2-R1 detections in the scan. The noise-equivalent flux density for each detection is given by 1075x103(mJy)*1.0857/sigma_m, where sigma_m is the photometric uncertainty, in magnitudes, before correction. 1075x103 mJy was a preliminary estimate of the H-band flux-for-zero-magnitude, and it differs slightly from the final estimate of 1024x103 mJy that is described in VI.4.a. To adjust the given value of h_pts_noise for the final calibration, subtract 0.0211.
k_pts_noise %7.3f --- no The base-10 logarithm of the characteristic Ks-band point source scan noise, in units of log(mJy). This is the mode of the distribution of the noise-equivalent flux densities for all Ks-band R2-R1 detections in the scan. The noise-equivalent flux density for each detection is given by 698.1x103(mJy)*1.0857/sigma_m, where sigma_m is the photometric uncertainty, in magnitudes, before correction. 698.1x103 mJy was a preliminary estimate of the Ks-band flux-for-zero-magnitude, and it differs slightly from the final estimate of 666.8x103 mJy that is described in VI.4.a. To adjust the given value of k_pts_noise for the final calibration, subtract 0.0199.
j_msnr10 %5.2f --- no The J-band magnitude at which SNR=10 is achieved for this scan, estimated using the photometric sensitivity parameter j_psp and zero point offset j_zp_ap. This estimate does not take into account the effect of confusion noise in high source density regions.
h_msnr10 %5.2f --- no The H-band magnitude at which SNR=10 is achieved for this scan, estimated using the photometric sensitivity parameter h_psp and zero point offset h_zp_ap. This estimate does not take into account the effect of confusion noise in high source density regions.
k_msnr10 %5.2f --- no The Ks-band magnitude at which SNR=10 is achieved for this scan, estimated using the photometric sensitivity parameter k_psp and zero point offset k_zp_ap. This estimate does not take into account the effect of confusion noise in high source density regions.
Information on Previous Releases
rel0 %1d --- no Flag indicating whether the scan is contained in the 2MASS Sampler Release.
  • "0" indicates non-inclusion in Sampler Release
  • "1" indicates inclusion in Sampler Release.
rel1 %1d --- no Flag indicating whether the scan is contained in the 2MASS First Incremental Data Release (IDR1).
  • "0" indicates non-inclusion in IDR1
  • "1" indicates inclusion in IDR1.
rel2 %1d --- no Flag indicating whether the scan is contained in the 2MASS Second Incremental Data Release (IDR2).
  • "0" indicates non-inclusion in IDR2
  • "1" indicates inclusion in IDR2.

 

3. XSC Parameters

a. Column Descriptions

The XSC contains 389 columns of information per source (most of which is photometry.) Because extended sources are much more complicated than a point source, it takes many more parameters to characterize them. Some parameters are required to describe the spatial extent of a source, and many more are required to characterize the photometry. In addition to a number of standard measures of photometry, the xsc also reports the magnitude as measured in a number of different fixed-size apertures. The columns are described in the tables below. We have separated the columns according to their basic function and utility.

Photometry algorithms and performance can be found here: Large Aperture Photometry: Profile Fitting, Isophotal & Total Mags
The XSC FAQ and Primer is here: How to Use the 2MASS XSC -- FAQ Sheet.


A. Name and Position Information

column Parameter Name View Format Units Description
1 jdate L 13.4f day Julian date of the source measurement accurate to ±3 minutes. This value is the mean Julian date of the scan observation in which this source falls. For a more precise value of Julian date for this source, see the jdate entry in the PSC using the pts_key index as a cross-reference. 
--- Position Information
2 designation S 17s - Source designation formed from sexigesimal coordinates.
This is the object sequence designation, or object "name" as specified by the IAU recommendations on source nomenclature. It is derived from the J2000 sexigesimal coordinates of the source and has the form HHMMSSSS+/-DDMMSSS, where HH are the hours of right ascension, MM the RA minutes and SSS are the deci-seconds of RA. DD are the degrees in declination, MM are DEC minutes and SS the declination seconds. Note that both the RA deci-seconds of time and DEC seconds of arc are truncated rather than rounded, per the IAU recommendation. The full 
naming convention for 2MASS All-Sky Release sources has the form "2MASX Jhhmmssss+ddmmsss[ABC...]", where "2MASX" indicates that the source is from the All-Sky XSC, "J" indicates the position is J2000, and the optional trailing letters are used to distinguish sources with otherwise duplicate names. The"2MASX J" prefix is not listed explicitly in the designation column.
3 ra S 10.6f deg Right ascension (J2000 decimal deg) based on peak pixel.
4 dec/decl S 10.6f deg Declination (J2000 decimal deg) based on peak pixel.
5 sup_ra L 10.6f deg Super-coadd centroid RA (J2000 decimal deg).
6 sup_dec L 10.6f deg Super-coadd centroid Dec (J2000 decimal deg).
7 glon L 7.3f deg Galactic longitude (decimal deg) based on peak pixel. Galactic coordinate for 2MASS source derived by precessing reconstructed ra and dec to B1950, and performing rotational transformation into lII, bII coordinate system. This coordinate should not be used as an astrometric reference because it has been rounded to 0.001 deg. 
8 glat L 7.3f deg Galactic latitude (decimal deg) based on peak pixel. Galactic coordinate for 2MASS source derived by precessing reconstructed ra and dec to B1950, and performing rotational transformation into lII, bII coordinate system. This coordinate should not be used as an astrometric reference because it has been rounded to 0.001 deg. 
9 density L 5.2f - Coadd log(density) of stars with k<14 mag. See Stellar Number Density Metric: "density". 

B. Standard (recommended) Photometry: Isophotal Apertures Based on the Ks 20 mag/arcsec^2 Elliptical Isophote, and 2-D Orientation

column Parameter Name View Format Units Description
--- Isophotal photom at 20 using K fiducial ellip ap
10 r_k20fe S 6.1f arcsec 20mag/sq." isophotal K fiducial ell. ap. semi-major axis.
"Fiducial" apertures are determined for each type of total and isophotal photometry measurements as described in the GALWORKS SDS. Essentially, they are used to make mag measurements for each type of photometry with the same aperture size in all three bands. The fiducial band for the total Kron photometry and 20mag/sq." isophotal photometry is the K band, and for the 21mag/sq." isophotal photometry it is the J band. 
See 
Large Aperture Photometry: Profile Fitting, Isophotal & Total Mags. 
11 j_m_k20fe S 6.3f mag J 20mag/sq." isophotal fiducial ell. ap. magnitude.
See Large Aperture Photometry: Profile Fitting, Isophotal & Total Mags. 
12 j_msig_k20fe S 5.3f mag J 1-sigma uncertainty in 20mag/sq." iso.fid.ell.mag.
13 j_flg_k20fe S 1hd - J confusion flag for 20mag/sq." iso. fid. ell. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
14 h_m_k20fe S 6.3f mag H 20mag/sq." isophotal fiducial ell. ap. magnitude.
See Large Aperture Photometry: Profile Fitting, Isophotal & Total Mags. 
15 h_msig_k20fe S 5.3f mag H 1-sigma uncertainty in 20mag/sq." iso.fid.ell.mag.
16 h_flg_k20fe S 1hd - H confusion flag for 20mag/sq." iso. fid. ell. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
17 k_m_k20fe S 6.3f mag K 20mag/sq." isophotal fiducial ell. ap. magnitude.
See Large Aperture Photometry: Profile Fitting, Isophotal & Total Mags. 
18 k_msig_k20fe S 5.3f mag K 1-sigma uncertainty in 20mag/sq." iso.fid.ell.mag.
19 k_flg_k20fe S 1hd - K confusion flag for 20mag/sq." iso. fid. ell. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
--- Elliptical Isophotal Orientation
20 r_3sig L 5.1f arcsec 3-sigma K isophotal semi-major axis.
21 j_ba L 5.3f - J minor/major axis ratio fit to the 3-sigma isophote.
22 j_phi L 3hd deg J angle to 3-sigma major axis (E of N).
23 h_ba L 5.3f - H minor/major axis ratio fit to the 3-sigma isophote.
24 h_phi L 3hd deg H angle to 3-sigma major axis (E of N).
25 k_ba S 5.3f - K minor/major axis ratio fit to the 3-sigma isophote.
26 k_phi S 3hd deg K angle to 3-sigma major axis (E of N).
27 sup_r_3sig L 5.1f arcsec Super-coadd 3-sigma isophotal semi-major axis radius.
28 sup_ba S 5.3f - Minor/major axis ratio fit to 3-sig. super-coadd isophote.
29 sup_phi S 3hd deg Super-coadd angle to major axis (E of N).

C. Large Apertures, including Kron and Total Versions, and Surface Brightness

column Parameter Name View Format Units Description
--- Photometry using Kron elliptical aperture
30 r_fe L 6.1f arcsec K fiducial Kron elliptical aperture semi-major axis.
"Fiducial" apertures are determined for each type of total and isophotal photometry measurements as described in the GALWORKS SDS. Essentially, they are used to make mag measurements for each type of photometry with the same aperture size in all three bands. The fiducial band for the total Kron photometry and 20mag/sq." isophotal photometry is the K band, and for the 21mag/sq." isophotal photometry it is the J band. 
See 
Large Aperture Photometry: Profile Fitting, Isophotal & Total Mags. 
31 j_m_fe L 6.3f mag J fiducial Kron elliptical aperture magnitude.
See Large Aperture Photometry: Profile Fitting, Isophotal & Total Mags. 
32 j_msig_fe L 5.3f mag J 1-sigma uncertainty in fiducial Kron ell. mag.
33 j_flg_fe L 1hd - J confusion flag for fiducial Kron ell. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
34 h_m_fe L 6.3f mag H fiducial Kron elliptical aperture magnitude.
See 
Large Aperture Photometry: Profile Fitting, Isophotal & Total Mags. 
35 h_msig_fe L 5.3f mag H 1-sigma uncertainty in fiducial Kron ell. mag.
36 h_flg_fe L 1hd - H confusion flag for fiducial Kron ell. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
37 k_m_fe L 6.3f mag K fiducial Kron ell. mag aperture magnitude.
See 
Large Aperture Photometry: Profile Fitting, Isophotal & Total Mags. 
38 k_msig_fe L 5.3f mag K 1-sigma uncertainty in fiducial Kron ell. mag.
39 k_flg_fe L 1hd - K confusion flag for fiducial Kron ell. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
--- Total Photometry from extrapolation of fit to radial profile
40 r_ext S 7.2f arcsec extrapolation/total radius.
See 
Large Aperture Photometry: Profile Fitting, Isophotal & Total Mags. 
41 j_m_ext S 6.3f mag J mag from fit extrapolation.
See 
Large Aperture Photometry: Profile Fitting, Isophotal & Total Mags. 
42 j_msig_ext L 5.3f mag J 1-sigma uncertainty in mag from fit extrapolation.
43 j_pchi S 6.3f - J chi^2 of fit to rad. profile (LCSB: alpha scale len).
If the source is not an LCSB, these fields contain the reduced chi-squared values for each band of the modified exponential fits to the elliptical radial profiles, used for extrapolation and half-light estimates. For LCSBs, they contain the alpha scale lengths.
44 h_m_ext S 6.3f mag H mag from fit extrapolation.
See 
Large Aperture Photometry: Profile Fitting, Isophotal & Total Mags. 
45 h_msig_ext S 5.3f mag H 1-sigma uncertainty in mag from fit extrapolation.
46 h_pchi L 6.3f - H chi^2 of fit to rad. profile (LCSB: alpha scale len).
If the source is not an LCSB, these fields contain the reduced chi-squared values for each band of the modified exponential fits to the elliptical radial profiles, used for extrapolation and half-light estimates. For LCSBs, they contain the alpha scale lengths.
47 k_m_ext S 6.3f mag K mag from fit extrapolation.
See 
Large Aperture Photometry: Profile Fitting, Isophotal & Total Mags. 
48 k_msig_ext S 5.3f mag K 1-sigma uncertainty in mag from fit extrapolation.
49 k_pchi L 6.3f - K chi^2 of fit to rad. profile (LCSB: alpha scale len).
If the source is not an LCSB, these fields contain the reduced chi-squared values for each band of the modified exponential fits to the elliptical radial profiles, used for extrapolation and half-light estimates. For LCSBs, they contain the alpha scale lengths.
--- Effective radii and mean surface brightness
50 j_r_eff L 6.2f arcsec J half-light (integrated half-flux point) radius. 
See 
Half-Light "Effective" Aperture & Concentration Index 
Beware the circularizing effect of the PSF on small galaxies. See The 2MASS Beam. 
51 j_mnsurfb_eff L 5.2f mag J mean surface brightness at the half-light radius. 
See 
Half-Light "Effective" Aperture & Concentration Index 
Beware the circularizing effect of the PSF on small galaxies. See The 2MASS Beam. 
52 h_r_eff L 6.2f arcsec H half-light (integrated half-flux point) radius. 
See 
Half-Light "Effective" Aperture & Concentration Index 
Beware the circularizing effect of the PSF on small galaxies. See The 2MASS Beam. 
53 h_mnsurfb_eff L 5.2f mag H mean surface brightness at the half-light radius. 
See 
Half-Light "Effective" Aperture & Concentration Index 
Beware the circularizing effect of the PSF on small galaxies. See The 2MASS Beam. 
54 k_r_eff L 6.2f arcsec K half-light (integrated half-flux point) radius. 
See 
Half-Light "Effective" Aperture & Concentration Index 
Beware the circularizing effect of the PSF on small galaxies. See The 2MASS Beam. 
55 k_mnsurfb_eff L 5.2f mag K mean surface brightness at the half-light radius. 
See 
Half-Light "Effective" Aperture & Concentration Index 
Beware the circularizing effect of the PSF on small galaxies. See The 2MASS Beam. 
56 j_con_indx L 5.2f - J concentration index r_75%/r_25%.
The concentration index for the galaxy in each band is the ratio of the radii which contain 75% and 25% of the total light, r_75%/r_25%. 
See 
Half-Light "Effective" Aperture & Concentration Index 
Beware the circularizing effect of the PSF on small galaxies. See The 2MASS Beam.
57 h_con_indx L 5.2f - H concentration index r_75%/r_25%.
The concentration index for the galaxy in each band is the ratio of the radii which contain 75% and 25% of the total light, r_75%/r_25%. 
See 
Half-Light "Effective" Aperture & Concentration Index 
Beware the circularizing effect of the PSF on small galaxies. See The 2MASS Beam.
58 k_con_indx L 5.2f - K concentration index r_75%/r_25%.
The concentration index for the galaxy in each band is the ratio of the radii which contain 75% and 25% of the total light, r_75%/r_25%. 
See 
Half-Light "Effective" Aperture & Concentration Index 
Beware the circularizing effect of the PSF on small galaxies. See The 2MASS Beam.
59 j_peak L 6.2f mag J peak pixel brightness.
60 h_peak L 6.2f mag H peak pixel brightness.
61 k_peak L 6.2f mag K peak pixel brightness.
62 j_5surf L 6.2f mag J central surface brightness (r<=5).
63 h_5surf L 6.2f mag H central surface brightness (r<=5).
64 k_5surf L 6.2f mag K central surface brightness (r<=5).

D. Miscellaneous Photometry and Characterization Measures

 

column Parameter Name View Format Units Description
--- Star-Galaxy Discrimination Scores
65 e_score L 5.2f - extended score: 1(extended) < e_score < 2(point-like).
See the FAQ: 
Star-Galaxy Separation: How do the E and G-scores work? 
66 g_score L 5.2f - galaxy score: 1(extended) < g_score < 2(point-like).
See the FAQ: 
Star-Galaxy Separation: How do the E and G-scores work? 
67 vc L 2hd - visual verification score for source.
The visual classification score gives the source type for those sources examined "by eye":
-2 = unknown 
-1 = no verification (i.e., not examined) 
1 = galaxy 
2 = non-extended (e.g., star, double, triple, artifact) 
See 
Visual Inspection of Extended Sources
68 cc_flg S 1s - indicates artifact contamination and/or confusion.
The contamination/confusion flag indicates whether the source's photometry and position may be affected by artifacts of, or confusion with, nearby bright stars. The flag consists of a single character string. Sources are tested for contamination and/or confusion in the order given below, and once a flag is applied to the source, testing is stopped in that band. The flag values indicate the source may be:
U: unreliable source; probable image artifact detection
C: affected by confusion with or artifact of a nearby bright star
A or a: known artifacts
z: in close promity to a large galaxy; these sources are usually junk
Z: Derived from the Large Galaxy Atlas
0: default value -- not contaminated
See 
Extended Source Confusion Flag
--- Postage-stamp image parameter
69 im_nx L 4hd - size of postage stamp image in pixels.
To access the XSC postage stamp images (both jpeg and FITS versions), click
2MASS All-Sky XSC Full-Resolution Image Server
--- Isophotal photom at 20 using K fiducial circ ap
70 r_k20fc L 5.1f arcsec 20mag/sq." isophotal K fiducial circular ap. radius.
"Fiducial" apertures are determined for each type of total and isophotal photometry measurements as described in the GALWORKS SDS. Essentially, they are used to make mag measurements for each type of photometry with the same aperture size in all three bands. The fiducial band for the total Kron photometry and 20mag/sq." isophotal photometry is the K band, and for the 21mag/sq." isophotal photometry it is the J band. Cautionary note: A negative value in this column indicates that the source measurement was corrupted, usually due to confusion from a nearby source, and the derived radius is not meaningful.
71 j_m_k20fc L 6.3f mag J 20mag/sq." isophotal fiducial circ. ap. mag.
72 j_msig_k20fc L 5.3f mag J 1-sigma uncertainty in 20mag/sq." iso.fid.circ. mag.
73 j_flg_k20fc L 1hd - J confusion flag for 20mag/sq." iso. fid. circ. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
74 h_m_k20fc L 6.3f mag H 20mag/sq." isophotal fiducial circ. ap. mag.
75 h_msig_k20fc L 5.3f mag H 1-sigma uncertainty in 20mag/sq." iso.fid.circ. mag.
76 h_flg_k20fc L 1hd - H confusion flag for 20mag/sq." iso. fid. circ. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
77 k_m_k20fc L 6.3f mag K 20mag/sq." isophotal fiducial circ. ap. mag.
78 k_msig_k20fc L 5.3f mag K 1-sigma uncertainty in 20mag/sq." iso.fid.circ. mag.
79 k_flg_k20fc L 1hd - K confusion flag for 20mag/sq." iso. fid. circ. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
--- Kron elliptical photometry
80 j_r_e L 5.1f arcsec J Kron elliptical aperture semi-major axis.
81 j_m_e L 6.3f mag J Kron elliptical aperture magnitude.
82 j_msig_e L 5.3f mag J 1-sigma uncertainty in Kron elliptical mag.
83 j_flg_e L 1hd - J confusion flag for Kron elliptical mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
84 h_r_e L 5.1f arcsec H Kron elliptical aperture semi-major axis.
85 h_m_e L 6.3f mag H Kron elliptical aperture magnitude.
86 h_msig_e L 5.3f mag H 1-sigma uncertainty in Kron elliptical mag.
87 h_flg_e L 1hd - H confusion flag for Kron elliptical mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
88 k_r_e L 5.1f arcsec K Kron elliptical aperture semi-major axis.
89 k_m_e L 6.3f mag K Kron elliptical aperture magnitude.
90 k_msig_e L 5.3f mag K 1-sigma uncertainty in Kron elliptical mag.
91 k_flg_e L 1hd - K confusion flag for Kron elliptical mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
--- Kron circular photometry
92 j_r_c L 5.1f arcsec J Kron circular aperture radius.
93 j_m_c L 6.3f mag J Kron circular aperture magnitude.
94 j_msig_c L 5.3f mag J 1-sigma uncertainty in Kron circular mag.
95 j_flg_c L 1hd - J confusion flag for Kron circular mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
96 h_r_c L 5.1f arcsec H Kron circular aperture radius.
97 h_m_c L 6.3f mag H Kron circular aperture magnitude.
98 h_msig_c L 5.3f mag H 1-sigma uncertainty in Kron circular mag.
99 h_flg_c L 1hd - H confusion flag for Kron circular mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
100 k_r_c L 5.1f arcsec K Kron circular aperture radius.
101 k_m_c L 6.3f mag K Kron circular aperture magnitude.
102 k_msig_c L 5.3f mag K 1-sigma uncertainty in Kron circular mag.
103 k_flg_c L 1hd - K confusion flag for Kron circular mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
--- Kron photometry using K fiducial circular aperture
104 r_fc L 5.1f arcsec K fiducial Kron circular aperture radius.
"Fiducial" apertures are determined for each type of total and isophotal photometry measurements as described in the GALWORKS SDS. Essentially, they are used to make mag measurements for each type of photometry with the same aperture size in all three bands. The fiducial band for the total Kron photometry and 20mag/sq." isophotal photometry is the K band, and for the 21mag/sq." isophotal photometry it is the J band.
105 j_m_fc L 6.3f mag J fiducial Kron circular magnitude.
106 j_msig_fc L 5.3f mag J 1-sigma uncertainty in fiducial Kron circ. mag.
107 j_flg_fc L 1hd - J confusion flag for fiducial Kron circ. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
108 h_m_fc L 6.3f mag H fiducial Kron circular magnitude.
109 h_msig_fc L 5.3f mag H 1-sigma uncertainty in fiducial Kron circ. mag.
110 h_flg_fc L 1hd - H confusion flag for fiducial Kron circ. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
111 k_m_fc L 6.3f mag K fiducial Kron circular magnitude.
112 k_msig_fc L 5.3f mag K 1-sigma uncertainty in fiducial Kron circ. mag.
113 k_flg_fc L 1hd - K confusion flag for fiducial Kron circ. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
--- Isophotal photom at 20 mag/sq.arcsec using ell ap
114 j_r_i20e L 5.1f arcsec J 20mag/sq." isophotal elliptical ap. semi-major axis.
115 j_m_i20e L 6.3f mag J 20mag/sq." isophotal elliptical ap. magnitude.
116 j_msig_i20e L 5.3f mag J 1-sigma uncertainty in 20mag/sq." iso. ell. mag.
117 j_flg_i20e L 1hd - J confusion flag for 20mag/sq." iso. ell. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
118 h_r_i20e L 5.1f arcsec H 20mag/sq." isophotal elliptical ap. semi-major axis.
119 h_m_i20e L 6.3f mag H 20mag/sq." isophotal elliptical ap. magnitude.
120 h_msig_i20e L 5.3f mag H 1-sigma uncertainty in 20mag/sq." iso. ell. mag.
121 h_flg_i20e L 1hd - H confusion flag for 20mag/sq." iso. ell. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
122 k_r_i20e L 5.1f arcsec K 20mag/sq." isophotal elliptical ap. semi-major axis.
123 k_m_i20e L 6.3f mag K 20mag/sq." isophotal elliptical ap. magnitude.
124 k_msig_i20e L 5.3f mag K 1-sigma uncertainty in 20mag/sq." iso. ell. mag.
125 k_flg_i20e L 1hd - K confusion flag for 20mag/sq." iso. ell. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
--- Isophotal photom at 20 mag/sq.arcsec using circ ap
126 j_r_i20c L 5.1f arcsec J 20mag/sq." isophotal circular aperture radius.
127 j_m_i20c L 6.3f mag J 20mag/sq." isophotal circular ap. magnitude.
128 j_msig_i20c L 5.3f mag J 1-sigma uncertainty in 20mag/sq." iso. circ. mag.
129 j_flg_i20c L 1hd - J confusion flag for 20mag/sq." iso. circ. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
130 h_r_i20c L 5.1f arcsec H 20mag/sq." isophotal circular aperture radius.
131 h_m_i20c L 6.3f mag H 20mag/sq." isophotal circular ap. magnitude.
132 h_msig_i20c L 5.3f mag H 1-sigma uncertainty in 20mag/sq." iso. circ. mag.
133 h_flg_i20c L 1hd - H confusion flag for 20mag/sq." iso. circ. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
134 k_r_i20c L 5.1f arcsec K 20mag/sq." isophotal circular aperture radius.
135 k_m_i20c L 6.3f mag K 20mag/sq." isophotal circular ap. magnitude.
136 k_msig_i20c L 5.3f mag K 1-sigma uncertainty in 20mag/sq." iso. circ. mag.
137 k_flg_i20c L 1hd - K confusion flag for 20mag/sq." iso. circ. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
--- Isophotal photom at 21 mag/sq.arcsec using ell ap
138 j_r_i21e L 5.1f arcsec J 21mag/sq." isophotal elliptical ap. semi-major axis.
139 j_m_i21e L 6.3f mag J 21mag/sq." isophotal elliptical ap. magnitude.
140 j_msig_i21e L 5.3f mag J 1-sigma uncertainty in 21mag/sq." iso. ell. mag.
141 j_flg_i21e L 1hd - J confusion flag for 21mag/sq." iso. ell. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
142 h_r_i21e L 5.1f arcsec H 21mag/sq." isophotal elliptical ap. semi-major axis.
143 h_m_i21e L 6.3f mag H 21mag/sq." isophotal elliptical ap. magnitude.
144 h_msig_i21e L 5.3f mag H 1-sigma uncertainty in 21mag/sq." iso. ell. mag.
145 h_flg_i21e L 1hd - H confusion flag for 21mag/sq." iso. ell. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
146 k_r_i21e L 5.1f arcsec K 21mag/sq." isophotal elliptical ap. semi-major axis.
147 k_m_i21e L 6.3f mag K 21mag/sq." isophotal elliptical ap. magnitude.
148 k_msig_i21e L 5.3f mag K 1-sigma uncertainty in 21mag/sq." iso. ell. mag.
149 k_flg_i21e L 1hd - K confusion flag for 21mag/sq." iso. ell. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
--- Isophotal photom at 21 using J fiducial ellip ap
150 r_j21fe L 5.1f arcsec 21mag/sq." isophotal J fiducial ell. ap. semi-major axis.
"Fiducial" apertures are determined for each type of total and isophotal photometry measurements as described in the GALWORKS SDS. Essentially, they are used to make mag measurements for each type of photometry with the same aperture size in all three bands. The fiducial band for the total Kron photometry and 20mag/sq." isophotal photometry is the K band, and for the 21mag/sq." isophotal photometry it is the J band.
151 j_m_j21fe L 6.3f mag J 21mag/sq." isophotal fiducial ell. ap. magnitude.
152 j_msig_j21fe L 5.3f mag J 1-sigma uncertainty in 21mag/sq." iso.fid.ell.mag.
153 j_flg_j21fe L 1hd - J confusion flag for 21mag/sq." iso. fid. ell. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
154 h_m_j21fe L 6.3f mag H 21mag/sq." isophotal fiducial ell. ap. magnitude.
155 h_msig_j21fe L 5.3f mag H 1-sigma uncertainty in 21mag/sq." iso.fid.ell.mag.
156 h_flg_j21fe L 1hd - H confusion flag for 21mag/sq." iso. fid. ell. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
157 k_m_j21fe L 6.3f mag K 21mag/sq." isophotal fiducial ell. ap. magnitude.
158 k_msig_j21fe L 5.3f mag K 1-sigma uncertainty in 21mag/sq." iso.fid.ell.mag.
159 k_flg_j21fe L 1hd - K confusion flag for 21mag/sq." iso. fid. ell. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
--- Isophotal photom at 21 using circ ap
160 j_r_i21c L 5.1f arcsec J 21mag/sq." isophotal circular aperture radius.
161 j_m_i21c L 6.3f mag J 21mag/sq." isophotal circular ap. magnitude.
162 j_msig_i21c L 5.3f mag J 1-sigma uncertainty in 21mag/sq." iso. circ. mag.
163 j_flg_i21c L 1hd - J confusion flag for 21mag/sq." iso. circ. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
164 h_r_i21c L 5.1f arcsec H 21mag/sq." isophotal circular aperture radius.
165 h_m_i21c L 6.3f mag H 21mag/sq." isophotal circular ap. magnitude.
166 h_msig_i21c L 5.3f mag H 1-sigma uncertainty in 21mag/sq." iso. circ. mag.
167 h_flg_i21c L 1hd - H confusion flag for 21mag/sq." iso. circ. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
168 k_r_i21c L 5.1f arcsec K 21mag/sq." isophotal circular aperture radius.
169 k_m_i21c L 6.3f mag K 21mag/sq." isophotal circular ap. magnitude.
170 k_msig_i21c L 5.3f mag K 1-sigma uncertainty in 21mag/sq." iso. circ. mag.
171 k_flg_i21c L 1hd - K confusion flag for 21mag/sq." iso. circ. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
--- Isophotal photom at 21 mag/sq.arcsec using J fiducial circ ap
172 r_j21fc L 5.1f arcsec 21mag/sq." isophotal J fiducial circular ap. radius.
"Fiducial" apertures are determined for each type of total and isophotal photometry measurements as described in the GALWORKS SDS. Essentially, they are used to make mag measurements for each type of photometry with the same aperture size in all three bands. The fiducial band for the total Kron photometry and 20mag/sq." isophotal photometry is the K band, and for the 21mag/sq." isophotal photometry it is the J band.
173 j_m_j21fc L 6.3f mag J 21mag/sq." isophotal fiducial circ. ap. mag.
174 j_msig_j21fc L 5.3f mag J 1-sigma uncertainty in 21mag/sq." iso.fid.circ.mag.
175 j_flg_j21fc L 1hd - J confusion flag for 21mag/sq." iso. fid. circ. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
176 h_m_j21fc L 6.3f mag H 21mag/sq." isophotal fiducial circ. ap. mag.
177 h_msig_j21fc L 5.3f mag H 1-sigma uncertainty in 21mag/sq." iso.fid.circ.mag.
178 h_flg_j21fc L 1hd - H confusion flag for 21mag/sq." iso. fid. circ. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
179 k_m_j21fc L 6.3f mag K 21mag/sq." isophotal fiducial circ. ap. mag.
180 k_msig_j21fc L 5.3f mag K 1-sigma uncertainty in 21mag/sq." iso.fid.circ.mag.
181 k_flg_j21fc L 1hd - K confusion flag for 21mag/sq." iso. fid. circ. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
--- Photometry from fixed circular aperture
182 j_m_5 L 6.3f mag J 5 arcsec radius circular aperture magnitude.
183 j_msig_5 L 5.3f mag J 1-sigma uncertainty in 5 arcsec circular ap. mag.
184 j_flg_5 L 1hd - J confusion flag for 5 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
185 h_m_5 L 6.3f mag H 5 arcsec radius circular aperture magnitude.
186 h_msig_5 L 5.3f mag H 1-sigma uncertainty in 5 arcsec circular ap. mag.
187 h_flg_5 L 1hd - H confusion flag for 5 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
188 k_m_5 L 6.3f mag K 5 arcsec radius circular aperture magnitude.
189 k_msig_5 L 5.3f mag K 1-sigma uncertainty in 5 arcsec circular ap. mag.
190 k_flg_5 L 1hd - K confusion flag for 5 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
191 j_m_7 L 6.3f mag J 7 arcsec radius circular aperture magnitude.
192 j_msig_7 L 5.3f mag J 1-sigma uncertainty in 7 arcsec circular ap. mag.
193 j_flg_7 L 1hd - J confusion flag for 7 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
194 h_m_7 L 6.3f mag H 7 arcsec radius circular aperture magnitude.
195 h_msig_7 L 5.3f mag H 1-sigma uncertainty in 7 arcsec circular ap. mag.
196 h_flg_7 L 1hd - H confusion flag for 7 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
197 k_m_7 L 6.3f mag K 7 arcsec radius circular aperture magnitude.
198 k_msig_7 L 5.3f mag K 1-sigma uncertainty in 7 arcsec circular ap. mag.
199 k_flg_7 L 1hd - K confusion flag for 7 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
200 j_m_10 L 6.3f mag J 10 arcsec radius circular aperture magnitude.
201 j_msig_10 L 5.3f mag J 1-sigma uncertainty in 10 arcsec circular ap. mag.
202 j_flg_10 L 1hd - J confusion flag for 10 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
203 h_m_10 L 6.3f mag H 10 arcsec radius circular aperture magnitude.
204 h_msig_10 L 5.3f mag H 1-sigma uncertainty in 10 arcsec circular ap. mag.
205 h_flg_10 L 1hd - H confusion flag for 10 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
206 k_m_10 L 6.3f mag K 10 arcsec radius circular aperture magnitude.
207 k_msig_10 L 5.3f mag K 1-sigma uncertainty in 10 arcsec circular ap. mag.
208 k_flg_10 L 1hd - K confusion flag for 10 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
209 j_m_15 L 6.3f mag J 15 arcsec radius circular aperture magnitude.
210 j_msig_15 L 5.3f mag J 1-sigma uncertainty in 15 arcsec circular ap. mag.
211 j_flg_15 L 1hd - J confusion flag for 15 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
212 h_m_15 L 6.3f mag H 15 arcsec radius circular aperture magnitude.
213 h_msig_15 L 5.3f mag H 1-sigma uncertainty in 15 arcsec circular ap. mag.
214 h_flg_15 L 1hd - H confusion flag for 15 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
215 k_m_15 L 6.3f mag K 15 arcsec radius circular aperture magnitude.
216 k_msig_15 L 5.3f mag K 1-sigma uncertainty in 15 arcsec circular ap. mag.
217 k_flg_15 L 1hd - K confusion flag for 15 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
218 j_m_20 L 6.3f mag J 20 arcsec radius circular aperture magnitude.
219 j_msig_20 L 5.3f mag J 1-sigma uncertainty in 20 arcsec circular ap. mag.
220 j_flg_20 L 1hd - J confusion flag for 20 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
221 h_m_20 L 6.3f mag H 20 arcsec radius circular aperture magnitude.
222 h_msig_20 L 5.3f mag H 1-sigma uncertainty in 20 arcsec circular ap. mag.
223 h_flg_20 L 1hd - H confusion flag for 20 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
224 k_m_20 L 6.3f mag K 20 arcsec radius circular aperture magnitude.
225 k_msig_20 L 5.3f mag K 1-sigma uncertainty in 20 arcsec circular ap. mag.
226 k_flg_20 L 1hd - K confusion flag for 20 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
227 j_m_25 L 6.3f mag J 25 arcsec radius circular aperture magnitude.
228 j_msig_25 L 5.3f mag J 1-sigma uncertainty in 25 arcsec circular ap. mag.
229 j_flg_25 L 1hd - J confusion flag for 25 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
230 h_m_25 L 6.3f mag H 25 arcsec radius circular aperture magnitude.
231 h_msig_25 L 5.3f mag H 1-sigma uncertainty in 25 arcsec circular ap. mag.
232 h_flg_25 L 1hd - H confusion flag for 25 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
233 k_m_25 L 6.3f mag K 25 arcsec radius circular aperture magnitude.
234 k_msig_25 L 5.3f mag K 1-sigma uncertainty in 25 arcsec circular ap. mag.
235 k_flg_25 L 1hd - K confusion flag for 25 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
236 j_m_30 L 6.3f mag J 30 arcsec radius circular aperture magnitude.
237 j_msig_30 L 5.3f mag J 1-sigma uncertainty in 30 arcsec circular ap. mag.
238 j_flg_30 L 1hd - J confusion flag for 30 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
239 h_m_30 L 6.3f mag H 30 arcsec radius circular aperture magnitude.
240 h_msig_30 L 5.3f mag H 1-sigma uncertainty in 30 arcsec circular ap. mag.
241 h_flg_30 L 1hd - H confusion flag for 30 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
242 k_m_30 L 6.3f mag K 30 arcsec radius circular aperture magnitude.
243 k_msig_30 L 5.3f mag K 1-sigma uncertainty in 30 arcsec circular ap. mag.
244 k_flg_30 L 1hd - K confusion flag for 30 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
245 j_m_40 L 6.3f mag J 40 arcsec radius circular aperture magnitude.
246 j_msig_40 L 5.3f mag J 1-sigma uncertainty in 40 arcsec circular ap. mag.
247 j_flg_40 L 1hd - J confusion flag for 40 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
248 h_m_40 L 6.3f mag H 40 arcsec radius circular aperture magnitude.
249 h_msig_40 L 5.3f mag H 1-sigma uncertainty in 40 arcsec circular ap. mag.
250 h_flg_40 L 1hd - H confusion flag for 40 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
251 k_m_40 L 6.3f mag K 40 arcsec radius circular aperture magnitude.
252 k_msig_40 L 5.3f mag K 1-sigma uncertainty in 40 arcsec circular ap. mag.
253 k_flg_40 L 1hd - K confusion flag for 40 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
254 j_m_50 L 6.3f mag J 50 arcsec radius circular aperture magnitude.
255 j_msig_50 L 5.3f mag J 1-sigma uncertainty in 50 arcsec circular ap. mag.
256 j_flg_50 L 1hd - J confusion flag for 50 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:

0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative


If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
257 h_m_50 L 6.3f mag H 50 arcsec radius circular aperture magnitude.
258 h_msig_50 L 5.3f mag H 1-sigma uncertainty in 50 arcsec circular ap. mag.
259 h_flg_50 L 1hd - H confusion flag for 50 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
260 k_m_50 L 6.3f mag K 50 arcsec radius circular aperture magnitude.
261 k_msig_50 L 5.3f mag K 1-sigma uncertainty in 50 arcsec circular ap. mag.
262 k_flg_50 L 1hd - K confusion flag for 50 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
263 j_m_60 L 6.3f mag J 60 arcsec radius circular aperture magnitude.
264 j_msig_60 L 5.3f mag J 1-sigma uncertainty in 60 arcsec circular ap. mag.
265 j_flg_60 L 1hd - J confusion flag for 60 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
266 h_m_60 L 6.3f mag H 60 arcsec radius circular aperture magnitude.
267 h_msig_60 L 5.3f mag H 1-sigma uncertainty in 60 arcsec circular ap. mag.
268 h_flg_60 L 1hd - H confusion flag for 60 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
269 k_m_60 L 6.3f mag K 60 arcsec radius circular aperture magnitude.
270 k_msig_60 L 5.3f mag K 1-sigma uncertainty in 60 arcsec circular ap. mag.
271 k_flg_60 L 1hd - K confusion flag for 60 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
272 j_m_70 L 6.3f mag J 70 arcsec radius circular aperture magnitude.
273 j_msig_70 L 5.3f mag J 1-sigma uncertainty in 70 arcsec circular ap. mag.
274 j_flg_70 L 1hd - J confusion flag for 70 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
275 h_m_70 L 6.3f mag H 70 arcsec radius circular aperture magnitude.
276 h_msig_70 L 5.3f mag H 1-sigma uncertainty in 70 arcsec circular ap. mag.
277 h_flg_70 L 1hd - H confusion flag for 70 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
278 k_m_70 L 6.3f mag K 70 arcsec radius circular aperture magnitude.
279 k_msig_70 L 5.3f mag K 1-sigma uncertainty in 70 arcsec circular ap. mag.
280 k_flg_70 L 1hd - K confusion flag for 70 arcsec circular ap. mag.
The confusion flags [jhk]_flg 
for each mag are defined as follows:
0 if no other sources within aperture used 
1 if ap contained pixels masked off in coadd 
2 if ap contained pixels masked off due to neighboring sources 
3 if ap contained pixels that had a point source flux subtracted off 
4 if ap contained pixels within bright star mask 
5 if ap contained pixels masked off due to persistence 
6 if aperture ran into coadd boundary
7 if ap contained pixels within bright galaxy mask 
9 if integrated flux is negative
If the integrated flux is negative, a mag value is calculated using
BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
the resulting mag range is between ~ 75 and 99.
--- System photometry
281 j_m_sys L 6.3f mag J system photometry magnitude.
The system flux includes the flux from this extended source and anything else in the immediate area, including stars and neighboring galaxies that "touch" this source.
282 j_msig_sys L 5.3f mag J 1-sigma uncertainty in system photometry mag.
283 h_m_sys L 6.3f mag H system photometry magnitude.
The system flux includes the flux from this extended source and anything else in the immediate area, including stars and neighboring galaxies that "touch" this source.
284 h_msig_sys L 5.3f mag H 1-sigma uncertainty in system photometry mag.
285 k_m_sys L 6.3f mag K system photometry magnitude.
The system flux includes the flux from this extended source and anything else in the immediate area, including stars and neighboring galaxies that "touch" this source.
286 k_msig_sys L 5.3f mag K 1-sigma uncertainty in system photometry mag.
287 sys_flg L 1hd - system flag: 0=no system, 1=nearby galaxy flux incl. in mag.
288 contam_flg L 1hd - contamination flag: 0=no stars, 1=stellar flux incl. in mag.
--- 5-sigma area ratios
289 j_5sig_ba L 5.3f - J minor/major axis ratio fit to the 5-sigma isophote.
290 j_5sig_phi L 3hd deg J angle to 5-sigma major axis (E of N).
291 h_5sig_ba L 5.3f - H minor/major axis ratio fit to the 5-sigma isophote.
292 h_5sig_phi L 3hd deg H angle to 5-sigma major axis (E of N).
293 k_5sig_ba L 5.3f - K minor/major axis ratio fit to the 5-sigma isophote.
294 k_5sig_phi L 3hd deg K angle to 5-sigma major axis (E of N).
--- 5-sigma to 3-sigma area
295 j_d_area L 3hd - J 5-sigma to 3-sigma differential area.
296 j_perc_darea L 3hd - J 5-sigma to 3-sigma percent area change.
297 h_d_area L 3hd - H 5-sigma to 3-sigma differential area.
298 h_perc_darea L 3hd - H 5-sigma to 3-sigma percent area change.
299 k_d_area L 3hd - K 5-sigma to 3-sigma differential area.
300 k_perc_darea L 3hd - K 5-sigma to 3-sigma percent area change.
--- Bi-symmetric quantities
301 j_bisym_rat L 5.3f - J bi-symmetric flux ratio.
302 j_bisym_chi L 6.3f - J bi-symmetric cross-correlation chi.
303 h_bisym_rat L 5.3f - H bi-symmetric flux ratio.
304 h_bisym_chi L 6.3f - H bi-symmetric cross-correlation chi.
305 k_bisym_rat L 5.3f - K bi-symmetric flux ratio.
306 k_bisym_chi L 6.3f - K bi-symmetric cross-correlation chi.
--- Parameters for extended src discrimination from point 
srcs
307 j_sh0 L 5.2f - J ridge shape (LCSB: BSNR limit).
308 j_sig_sh0 L 5.2f - J ridge shape sigma (LCSB: B2SNR limit).
309 h_sh0 L 5.2f - H ridge shape (LCSB: BSNR limit).
310 h_sig_sh0 L 5.2f - H ridge shape sigma (LCSB: B2SNR limit).
311 k_sh0 L 5.2f - K ridge shape (LCSB: BSNR limit).
312 k_sig_sh0 L 5.2f - K ridge shape sigma (LCSB: B2SNR limit).
313 j_sc_mxdn L 6.1f - J mxdn (score) (LCSB: BSNR - block/smoothed SNR).
314 j_sc_sh L 6.1f - J shape (score).
315 j_sc_wsh L 6.1f - J wsh (score) (LCSB: PSNR - peak raw SNR).
316 j_sc_r23 L 6.1f - J r23 (score) (LCSB: TSNR - integrated SNR for r=15).
317 j_sc_1mm L 6.1f - J 1st moment (score) (LCSB: super blk 2,4,8 SNR).
318 j_sc_2mm L 6.1f - J 2nd moment (score) (LCSB: SNRMAX - super SNR max).
319 j_sc_vint L 6.1f - J vint (score).
320 j_sc_r1 L 6.1f - J r1 (score).
321 j_sc_msh L 6.1f - J median shape score.
322 h_sc_mxdn L 6.1f - H mxdn (score) (LCSB: BSNR - block/smoothed SNR).
323 h_sc_sh L 6.1f - H shape (score).
324 h_sc_wsh L 6.1f - H wsh (score) (LCSB: PSNR - peak raw SNR).
325 h_sc_r23 L 6.1f - H r23 (score) (LCSB: TSNR - integrated SNR for r=15).
326 h_sc_1mm L 6.1f - H 1st moment (score) (LCSB: super blk 2,4,8 SNR).
327 h_sc_2mm L 6.1f - H 2nd moment (score) (LCSB: SNRMAX - super SNR max).
328 h_sc_vint L 6.1f - H vint (score).
329 h_sc_r1 L 6.1f - H r1 (score).
330 h_sc_msh L 6.1f - H median shape score.
331 k_sc_mxdn L 6.1f - K mxdn (score) (LCSB: BSNR - block/smoothed SNR).
332 k_sc_sh L 6.1f - K shape (score).
333 k_sc_wsh L 6.1f - K wsh (score) (LCSB: PSNR - peak raw SNR).
334 k_sc_r23 L 6.1f - K r23 (score) (LCSB: TSNR - integrated SNR for r=15).
335 k_sc_1mm L 6.1f - K 1st moment (score) (LCSB: super blk 2,4,8 SNR).
336 k_sc_2mm L 6.1f - K 2nd moment (score) (LCSB: SNRMAX - super SNR max).
337 k_sc_vint L 6.1f - K vint (score).
338 k_sc_r1 L 6.1f - K r1 (score).
339 k_sc_msh L 6.1f - K median shape score.
340 j_chif_ellf L 6.1f - J % chi-fraction for elliptical fit to 3-sig isophote.
341 k_chif_ellf L 6.1f - K % chi-fraction for elliptical fit to 3-sig isophote.
342 ellfit_flg L 1hd - ellipse fitting contamination flag.
343 sup_chif_ellf L 6.1f - super-coadd % chi-fraction for ellip. fit to 3-sig isophote.
--- Coadd background, brightness
344 n_blank L 4hd - number of blanked source records.
These parameters refer to sources that were blanked and/or subtracted from the images before doing photometry. Data for each of these blanked or subtracted sources are found in the blanked and subtracted source tables.
345 n_sub L 4hd - number of subtracted source records.
These parameters refer to sources that were blanked and/or subtracted from the images before doing photometry. Data for each of these blanked or subtracted sources are found in the blanked and subtracted source tables.
346 bl_sub_flg L 1hd - blanked/subtracted src description flag.
--- Other miscellaneous parameters
347 id_flg L 1hd - type/galaxy ID flag (0=non-catalog, 1=catalog, 2=LCSB).
This flag indicates the extended source catalog type as follows:
0 = extended source not found in another catalog 
1 = extended source is found in galaxy catalog (ID found in id_cat field)
2 = LCSB (Low Central Surface Brightness) source
348 id_cat L 20s - matched galaxy's catalog name.
349 fg_flg L 6s - flux-growth convergence flag.
350 blk_fac L 1hd - LCSB blocking factor (1, 2, 4, 8).
351 dup_src L 1hd - Duplicate source flag. Used in conjunction with the use_src flag, this numerical flag indicates whether the source falls in a Tile overlap region, and if so, if it was detected multiple times.
352 use_src L 1hd - Use source flag. Used in conjunction with the dup_src flag, this numerical flag indicates if a source falls within a Tile overlap region, and whether or not it satisfies the unbiased selection rules for multiple source resolution.
353 prox L 5.1f arcsec Proximity. The distance between this source and its nearest neighbor in the PSC. The pts_key of the nearest source is given in the pxcntr column. The effective resolution of the 2MASS system is approximately 5". Any source with prox < 6" is potentially confused with a nearby object, and should be used with caution. 
354 pxpa L 3hd deg The position angle on the sky of the vector from the source to the nearest neighbor in the PSC, in degrees East of North. This column in null if prox=0.0, which occurs only for confused sources or from errors in the bandmerge process caused by confusion. 
355 pxcntr L 10d - ext_key value of nearest XSC source.
356 dist_edge_ns L %5d arcsec The distance from the source to the nearest North or South scan edge. The scan edge is defined by the great-circle interpolation between the 3-band coverage corners. The equatorial coordinates of the 3-band coverage corners are given in the Scan Information Table, referenced by the scan_key. The first character of the dist_edge_flg indicates to which edge the source is closer. 
357 dist_edge_ew L %3d arcsec The distance from the source to the nearest East or West scan edge. The scan edge is defined by the great-circle interpolation between the 3-band coverage corners. The equatorial coordinates of the 3-band coverage corners are given in the Scan Information Table, referenced by the scan_key. The second character of the dist_edge_flg indicates to which edge the source is closer.
358 dist_edge_flg L %2s - flag indicating which edges ([n|s][e|w]) are nearest to src.
359 pts_key L 10d - key to point source data DB record.
If the source has point source data (i.e. it is not an LCSB), this field will be set to the key of the record in the point source table containing the point source data. The point source data will also have the same date, hemisphere, scan, id keys.
360 mp_key L 5d - key to minor planet prediction DB record.
If a minor planet (asteroid) is predicted at this src's position, the field is set to the key of the record containing the minor planet prediction data (see the minor planet tbls). The minor planet data will also have the same date, hemisphere, scan, id keys.
361 night_key L 4d - key to night data record in "scan DB".
This field is set to the key of the record containing the corresponding night data in the night data table. The records will also have the same date and hemisphere keys.
362 scan_key S 6d - key to scan data record in "scan DB".
This field is set to the key of the record containing the corresponding scan data in the scan data table. The records will also have the same date, hemisphere, scan keys.
363 coadd_key L 7d - key to coadd data record in "scan DB".
This field is set to the key of the record containing the corresponding J, H, and K band coadd data in the coadd data table. The records will also have the same date, hemisphere, scan, coadd keys.
364 hemis L 1s - hemisphere (N/S) of observation. "n" = North/Mt. Hopkins; "s" = South/CTIO. 
365 date L yyyy-mm-dd - The observation reference date for this source expressed in ISO standard format. This is the UT day value at sunrise for the night on which the source was observed. Because it is possible for the UT day to change during a night of observations, the actual UT date for a source measurement can differ from date by one day. Use the Julian Day value (jdate) for a more accurate determination of the observation time of the source.
366 scan L 3hd - scan number (unique within date).
367 coadd L 03hd - 3-digit coadd number (unique within scan).
368 id L 6d - source ID number (unique within scan, coadd).
369 x_coadd L 6.1f arcsec x (cross-scan) position (coadd coord.).
370 y_coadd L 6.1f arcsec y (in-scan) position (coadd coord.).
371 j_subst2 L 6.1f - J residual background #2 (score).
372 h_subst2 L 6.1f - H residual background #2 (score).
373 k_subst2 L 6.1f - K residual background #2 (score).
374 j_back L 6.1f - J coadd median background.
375 h_back L 6.1f - H coadd median background.
376 k_back L 6.1f - K coadd median background.
377 j_resid_ann L 7.3f DN J residual annulus background median.
378 h_resid_ann L 7.3f DN H residual annulus background median.
379 k_resid_ann L 7.3f DN K residual annulus background median.
380 j_bndg_per L 5d arcsec J banding Fourier Transf. period on this side of coadd.
381 j_bndg_amp L 6.3f DN J banding maximum FT amplitude on this side of coadd.
382 h_bndg_per L 5d arcsec H banding Fourier Transf. period on this side of coadd.
383 h_bndg_amp L 6.3f DN H banding maximum FT amplitude on this side of coadd.
384 k_bndg_per L 5d arcsec K banding Fourier Transf. period on this side of coadd.
385 k_bndg_amp L 6.3f DN K banding maximum FT amplitude on this side of coadd.
386 j_seetrack L 4.1f - J band seetracking score.
387 h_seetrack L 4.1f - H band seetracking score.
388 k_seetrack L 4.1f - K band seetracking score.
389 ext_key S 9d - entry counter (key) number (unique within table).

 

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  • 2MASS All Sky Release(2015-09-15 07:08)