TABLE  twomass_psc

Contains the parameters provided for each source in the TWOMASS All Sky Release PSC.

This table contains brief descriptions of the parameters provided for
each source in the TWOMASS 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.
WFAU gratefully acknowledges help from IPAC at Caltech in enabling a
bulk download of the entire catalogue for local deployment in the VSA/WSA.
Any issues encountered or questions raised in use of this incarnation of
the IPAC IRSA catalogue should be communicated to the vsa- or wsa-support helpdesks
in the first instance. For a complete description please see the
user's guide to the 2MASS PSC all-sky data release


Required constraints:
  • Primary key is (pts_key)
  • (ext_key) references twomass_xsc(ext_key)
  • (scan_key) references twomass_scn(scan_key)

NameTypeLengthUnitDescriptionDefault ValueUnified Content Descriptor
cxfloat8 unit vector of spherical co-ordinates POS_EQ_X
cyfloat8 unit vector of spherical co-ordinates POS_EQ_Y
czfloat8 unit vector of spherical co-ordinates POS_EQ_Z
htmIDbigint8 Hierarchical Triangular Mesh (HTM) index, 20 deep, for equatorial co-ordinates POS_GENERAL
rafloat8degreesJ2000 right ascension with respect to the ICRS POS_EQ_RA_MAIN
decfloat8degreesJ2000 declination with respect to the ICRS POS_EQ_DEC_MAIN
err_majreal4arcsecSemi-major axis length of the one sigma position uncertainty ellipse EXTENSION_RAD
err_minreal4arcsecSemi-minor axis length of the one sigma position uncertainty ellipse EXTENSION_RAD
err_angsmallint2degreesPosition angle on the sky of the semi-major axis of the position uncertainty ellipse (East of North) POS_POS-ANG
designationvarchar17 Sexagesimal, equatorial position-based source name in the form: hhmmssss+ddmmsss[ABC...]. NAME
j_mreal4magDefault J-band magnitude SPECT_FLUX_VALUE
j_cmsigreal4magCorrected photometric uncertainty for the default J-band magnitude. SPECT_FLUX_VALUE
j_msigcomreal4magCombined, or total photometric uncertainty for the default J-band magnitude. SPECT_FLUX_VALUE
j_snrreal4magJ-band "scan" signal-to-noise ratio. INST_NOISE
h_mreal4magDefault H-band magnitude SPECT_FLUX_VALUE
h_cmsigreal4magCorrected photometric uncertainty for the default H-band magnitude. SPECT_FLUX_VALUE
h_msigcomreal4magCombined, or total photometric uncertainty for the default H-band magnitude. SPECT_FLUX_VALUE
h_snrreal4magH-band "scan" signal-to-noise ratio. INST_NOISE
k_mreal4magDefault Ks-band magnitude SPECT_FLUX_VALUE
k_cmsigreal4magCorrected photometric uncertainty for the default Ks-band magnitude. SPECT_FLUX_VALUE
k_msigcomreal4magCombined, or total photometric uncertainty for the default Ks-band magnitude. SPECT_FLUX_VALUE
k_snrreal4magKs-band "scan" signal-to-noise ratio. INST_NOISE
ph_qualvarchar3 Photometric quality flag. CODE_QUALITY
rd_flgvarchar3 Read flag. CODE_MISC
bl_flgvarchar3 Blend flag. CODE_MISC
cc_flgvarchar3 Contamination and confusion flag. CODE_MISC
ndetvarchar6 Frame detection statistics. NUMBER
proxreal4arcsecProximity. POS_ANG_DIST_GENERAL
pxpasmallint2degreesThe position angle on the sky of the vector from the source to the nearest neighbor in the PSC, in degrees East of North. POS_POS-ANG
pxcntrint4 The pts_key value of the nearest source in the PSC. NUMBER
gal_contamsmallint2 Extended source "contamination" flag. CODE_MISC
mp_flgsmallint2 Minor Planet Flag. CODE_MISC
pts_keyint4 A unique identification number for the PSC source. ID_NUMBER
hemisvarchar1 Hemisphere code for the TWOMASS Observatory from which this source was observed. OBS_CODE
datedatetime8yyyy-mm-ddThe observation reference date for this source expressed in ISO standard format. (YYYY-MM-DD) TIME_DATE
scansmallint2 The nightly scan number in which the source was detected. NUMBER
glonreal4degreesGalactic longitude rounded to 0.001 deg. POS_GAL_LON
glatreal4degreesGalactic latitude rounded to 0.001 deg. POS_GAL_LAT
x_scanreal4arcsecMean cross-scan focal plane position of the source in the Universal scan (U-scan) coordinate system. INST_POS
jdatefloat8Julian daysThe Julian Date of the source measurement accurate to +-30 seconds. TIME_DATE
j_psfchireal4 Reduced chi-squared goodness-of-fit value for the J-band profile-fit photometry made on the 1.3 s "Read_2" exposures. FIT_PARAM_VALUE
h_psfchireal4 Reduced chi-squared goodness-of-fit value for the H-band profile-fit photometry made on the 1.3 s "Read_2" exposures. FIT_PARAM_VALUE
k_psfchireal4 Reduced chi-squared goodness-of-fit value for the Ks-band profile-fit photometry made on the 1.3 s "Read_2" exposures. FIT_PARAM_VALUE
j_m_stdapreal4magJ-band "standard" aperture magnitude. SPECT_FLUX_VALUE
j_msig_stdapreal4magUncertainty in the J-band standard aperture magnitude. SPECT_FLUX_VALUE
h_m_stdapreal4magH-band "standard" aperture magnitude. SPECT_FLUX_VALUE
h_msig_stdapreal4magUncertainty in the H-band standard aperture magnitude. SPECT_FLUX_VALUE
k_m_stdapreal4magKs-band "standard" aperture magnitude. SPECT_FLUX_VALUE
k_msig_stdapreal4magUncertainty in the Ks-band standard aperture magnitude. SPECT_FLUX_VALUE
dist_edge_nsint4arcsecThe distance from the source to the nearest North or South scan edge. INST_PLATE_DIST
dist_edge_ewint4arcsecThe distance from the source to the nearest East or West scan edge. INST_PLATE_DIST
dist_edge_flgvarchar2 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. INST_PLATE_DIST
dup_srcsmallint2 Duplicate source flag. CODE_MISC
use_srcsmallint2 Use source flag. CODE_MISC
avarchar1 Catalog identifier of an optical source from either the Tycho 2 or USNO-A2.0 catalog that falls within ~5" of the TWOMASS source position. ID_ALTERNATIVE
dist_optreal4arcsecDistance separating TWOMASS source position and associated optical source within 5". INST_PLATE_DIST
phi_optsmallint2degreesPosition angle on the sky of the vector from the the associated optical source to the TWOMASS source position, in degrees East of North. POS_POS-ANG
b_m_optreal4magBlue magnitude of associated optical source. SPECT_FLUX_VALUE
vr_m_optreal4magVisual or red magnitude of the associated optical source. SPECT_FLUX_VALUE
nopt_mchssmallint2 The number of USNO-A2.0 or Tycho 2 optical sources found within a 5" radius of the TWOMASS position. NUMBER
ext_keyint4 Unique identification number of the record in the XSC that corresponds to this point source. ID_NUMBER
scan_keyint4 Unique identification number of the record in the Scan Information Table that corresponds to the survey scan in which this source was detected. ID_NUMBER
coadd_keyint4 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. ID_NUMBER
coaddsmallint2 Sequence number of the Atlas Image in which the position of this source falls. NUMBER
Total length271