IMAGE_INVENTORY TABLE DESCRIPTION


 NAME FORMAT NULLS COMMENT
date date 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.   Same as date column in 2MASS all sky catalogs.
hemis char(1) no Hemisphere code for the 2MASS Observatory from which this scan was observed. Same as hemis column in 2MASS all sky catalogs.
  • "n" = North/Mt. Hopkins
  • "s" = South/CTIO
scan smallint no The nightly scan number in which the source was detected.  Same as scan column in 2MASS all sky catalogs.
coadd smallint no
Coadd number.  Same as coadd column in 2MASS all sky catalogs.
band char(1) no Band. (J, H, or K)
f_name char(25) no File name.  BDDDDDDHSSSTCCC.fits.(gz or bz2)
  • "B"     = band (J, H, or K)
  • "DDDDDD"= date
  • "H"      = hemisphere (observatory location)
  • "SSS" = scan
  • "T"       = file data type (H,M, or 0)
  • "CCC" = coadd
The file name is unique.

f_size		 int no File size in bytes.
ra float no Right ascension of image center from fits header.
decl float no Declination of image center from fits header.
s_type
 char(3) no Scan type.  
  • "sci"  = 6 degree long science data scan.
  • "cal"  = 1 degree long calibration data scan.
  • "flt"    = Scan taken during twilight used to flat field the NICMOS arrays.
  • "dar" = Dark scan taken with cold shutter in front of arrays.
  • "lsc"  = 6 degree long science data scan taken with 6X the normal integration time.
  • "tst"   = Test scan, frequently used for determining focus settings.
  • "lca"  = Calibration scan taken with 6X the normal r2-r1 integration time.
  • "lda"  = Dark scan taken with 6X the normal r2-r1 integration time.
naxis2 smallint no Number of image pixels in declination direction.  The number of pixels in the e-w direction (naxis1) is always 512.
disk char(4) no 750 GB SATA diisk label where image is stored.  
ia_1   Date before February 1, 1998
ia_2   Date between February 1, 1998 and December 30, 1999
ia_3   Date after December 30, 1999
f_type char(1) no File type.
  • "0"   =   Original IPAC image file.
  • "H"   =   H-Compressed IPAC image file.
  • "M"   =   UMASS modified original IPAC image file. All images from the all sky catalog are present in the table as both type H and type M.
cat char(1) no Catalog.
  • "y"     =   Science scan used in generating the 4-pi SR 2MASS All Sky Catalog
  • "n"     =   All other scans
qual smallint yes Scan photometric quality.   Quality scoring rules for cal scans are different from those of other scans!
Calibration scans:
  • "10"   =  Suitable for photometric calibration using aperture photometry but not necessarily suitable for psf-fit photometry requiring good seeing.
Science scans:
  • "1-10" = Estimate of photometric quality of psf-fit photmetry.  10 is highest quality.  Quality < 5 not suitable for use in catalogs without overrides.