| 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:
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| Name | Type | Length | Unit | Description | Default Value | Unified Content Descriptor |
|---|---|---|---|---|---|---|
| cx | float | 8 | unit vector of spherical co-ordinates | POS_EQ_X | ||
| cy | float | 8 | unit vector of spherical co-ordinates | POS_EQ_Y | ||
| cz | float | 8 | unit vector of spherical co-ordinates | POS_EQ_Z | ||
| htmID | bigint | 8 | Hierarchical Triangular Mesh (HTM) index, 20 deep, for equatorial co-ordinates | POS_GENERAL | ||
| ra | float | 8 | degrees | J2000 right ascension with respect to the ICRS | POS_EQ_RA_MAIN | |
| dec | float | 8 | degrees | J2000 declination with respect to the ICRS | POS_EQ_DEC_MAIN | |
| err_maj | real | 4 | arcsec | Semi-major axis length of the one sigma position uncertainty ellipse | EXTENSION_RAD | |
| err_min | real | 4 | arcsec | Semi-minor axis length of the one sigma position uncertainty ellipse | EXTENSION_RAD | |
| err_ang | smallint | 2 | degrees | Position angle on the sky of the semi-major axis of the position uncertainty ellipse (East of North) | POS_POS-ANG | |
| designation | varchar | 17 | Sexagesimal, equatorial position-based source name in the form: hhmmssss+ddmmsss[ABC...]. | NAME | ||
| j_m | real | 4 | mag | Default J-band magnitude | SPECT_FLUX_VALUE | |
| j_cmsig | real | 4 | mag | Corrected photometric uncertainty for the default J-band magnitude. | SPECT_FLUX_VALUE | |
| j_msigcom | real | 4 | mag | Combined, or total photometric uncertainty for the default J-band magnitude. | SPECT_FLUX_VALUE | |
| j_snr | real | 4 | mag | J-band "scan" signal-to-noise ratio. | INST_NOISE | |
| h_m | real | 4 | mag | Default H-band magnitude | SPECT_FLUX_VALUE | |
| h_cmsig | real | 4 | mag | Corrected photometric uncertainty for the default H-band magnitude. | SPECT_FLUX_VALUE | |
| h_msigcom | real | 4 | mag | Combined, or total photometric uncertainty for the default H-band magnitude. | SPECT_FLUX_VALUE | |
| h_snr | real | 4 | mag | H-band "scan" signal-to-noise ratio. | INST_NOISE | |
| k_m | real | 4 | mag | Default Ks-band magnitude | SPECT_FLUX_VALUE | |
| k_cmsig | real | 4 | mag | Corrected photometric uncertainty for the default Ks-band magnitude. | SPECT_FLUX_VALUE | |
| k_msigcom | real | 4 | mag | Combined, or total photometric uncertainty for the default Ks-band magnitude. | SPECT_FLUX_VALUE | |
| k_snr | real | 4 | mag | Ks-band "scan" signal-to-noise ratio. | INST_NOISE | |
| ph_qual | varchar | 3 | Photometric quality flag. | CODE_QUALITY | ||
| rd_flg | varchar | 3 | Read flag. | CODE_MISC | ||
| bl_flg | varchar | 3 | Blend flag. | CODE_MISC | ||
| cc_flg | varchar | 3 | Contamination and confusion flag. | CODE_MISC | ||
| ndet | varchar | 6 | Frame detection statistics. | NUMBER | ||
| prox | real | 4 | arcsec | Proximity. | POS_ANG_DIST_GENERAL | |
| pxpa | smallint | 2 | degrees | The 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 | |
| pxcntr | int | 4 | The pts_key value of the nearest source in the PSC. | NUMBER | ||
| gal_contam | smallint | 2 | Extended source "contamination" flag. | CODE_MISC | ||
| mp_flg | smallint | 2 | Minor Planet Flag. | CODE_MISC | ||
| pts_key | int | 4 | A unique identification number for the PSC source. | ID_NUMBER | ||
| hemis | varchar | 1 | Hemisphere code for the TWOMASS Observatory from which this source was observed. | OBS_CODE | ||
| date | datetime | 8 | yyyy-mm-dd | The observation reference date for this source expressed in ISO standard format. (YYYY-MM-DD) | TIME_DATE | |
| scan | smallint | 2 | The nightly scan number in which the source was detected. | NUMBER | ||
| glon | real | 4 | degrees | Galactic longitude rounded to 0.001 deg. | POS_GAL_LON | |
| glat | real | 4 | degrees | Galactic latitude rounded to 0.001 deg. | POS_GAL_LAT | |
| x_scan | real | 4 | arcsec | Mean cross-scan focal plane position of the source in the Universal scan (U-scan) coordinate system. | INST_POS | |
| jdate | float | 8 | Julian days | The Julian Date of the source measurement accurate to +-30 seconds. | TIME_DATE | |
| j_psfchi | real | 4 | 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_psfchi | real | 4 | 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_psfchi | real | 4 | 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_stdap | real | 4 | mag | J-band "standard" aperture magnitude. | SPECT_FLUX_VALUE | |
| j_msig_stdap | real | 4 | mag | Uncertainty in the J-band standard aperture magnitude. | SPECT_FLUX_VALUE | |
| h_m_stdap | real | 4 | mag | H-band "standard" aperture magnitude. | SPECT_FLUX_VALUE | |
| h_msig_stdap | real | 4 | mag | Uncertainty in the H-band standard aperture magnitude. | SPECT_FLUX_VALUE | |
| k_m_stdap | real | 4 | mag | Ks-band "standard" aperture magnitude. | SPECT_FLUX_VALUE | |
| k_msig_stdap | real | 4 | mag | Uncertainty in the Ks-band standard aperture magnitude. | SPECT_FLUX_VALUE | |
| dist_edge_ns | int | 4 | arcsec | The distance from the source to the nearest North or South scan edge. | INST_PLATE_DIST | |
| dist_edge_ew | int | 4 | arcsec | The distance from the source to the nearest East or West scan edge. | INST_PLATE_DIST | |
| dist_edge_flg | varchar | 2 | 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_src | smallint | 2 | Duplicate source flag. | CODE_MISC | ||
| use_src | smallint | 2 | Use source flag. | CODE_MISC | ||
| a | varchar | 1 | 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_opt | real | 4 | arcsec | Distance separating TWOMASS source position and associated optical source within 5". | INST_PLATE_DIST | |
| phi_opt | smallint | 2 | degrees | Position 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_opt | real | 4 | mag | Blue magnitude of associated optical source. | SPECT_FLUX_VALUE | |
| vr_m_opt | real | 4 | mag | Visual or red magnitude of the associated optical source. | SPECT_FLUX_VALUE | |
| nopt_mchs | smallint | 2 | The number of USNO-A2.0 or Tycho 2 optical sources found within a 5" radius of the TWOMASS position. | NUMBER | ||
| ext_key | int | 4 | Unique identification number of the record in the XSC that corresponds to this point source. | ID_NUMBER | ||
| scan_key | int | 4 | 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_key | int | 4 | 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 | ||
| coadd | smallint | 2 | Sequence number of the Atlas Image in which the position of this source falls. | NUMBER | ||
| Total length | 271 |