The 2MASS Point Source catalogue of 470,992,970 sources.

Column | Type | Units | UCD | Error | Description | Links |
---|---|---|---|---|---|---|

ra | double | deg | pos.eq.ra;meta.main | (ra) Right ascension (J2000) | ||

decl | double | deg | pos.eq.dec;meta.main | (dec) Declination (J2000) | ||

err_maj | double | arcsec | stat.error | (err_maj) Major axis of position error ellipse | ||

err_min | double | arcsec | stat.error | (err_min) Minor axis of position error ellipse | ||

err_ang | int | deg | stat.error | [0,180] (err_ang) Position angle of error ellipse major axis (E of N) | ||

designation | string | char | meta.id;meta.main | (designation) Source designation | ||

j_m | double | mag | phot.mag;em.IR.J | (j_m) J selected default magnitude | ||

j_cmsig | double | mag | stat.error;phot.mag | (j_cmsig) J default magnitude uncertainty | ||

j_msigcom | double | mag | stat.error;phot.mag;em.IR.J | (j_msigcom) J total magnitude uncertainty | ||

j_snr | double | mag | stat.snr | (j_snr) J Signal-to-noise ratio | ||

h_m | double | mag | phot.mag;em.IR.H | (h_m) H selected default magnitude | ||

h_cmsig | double | mag | stat.error;phot.mag | (h_cmsig) H default magnitude uncertainty | ||

h_msigcom | double | mag | stat.error;phot.mag;em.IR.H | (h_msigcom) H total magnitude uncertainty | ||

h_snr | double | mag | stat.snr | (h_snr) H Signal-to-noise ratio | ||

k_m | double | mag | phot.mag;em.IR.K | (k_m) K selected default magnitude | ||

k_cmsig | double | mag | stat.error;phot.mag | (k_cmsig) K default magnitude uncertainty | ||

k_msigcom | double | mag | stat.error;phot.mag;em.IR.K | (k_msigcom) K total magnitude uncertainty | ||

k_snr | double | mag | stat.snr | (k_snr) K Signal-to-noise ratio | ||

ph_qual | string | meta.code.qual;phot | (ph_qual) JHK Photometric quality flag | |||

rd_flg | string | meta.ref | (rd_flg) Source of JHK default mag | |||

bl_flg | string | meta.code | (bl_flg) JHK components fit to source | |||

cc_flg | string | meta.code | (cc_flg) Artifact contamination, confusion | |||

ndet | string | meta.number | [0-9] (ndet) Number of aperture measurements (jjhhkk) | |||

prox | double | arcsec | pos.angDistance | Distance between source and nearest neighbour | ||

pxpa | int | deg | pos.posAng | (pxpa) Position angle of vector from source to nearest neighbour (E of N) | ||

pxcntr | int | meta.number | (pxcntr) Sequence number of nearest neighbour | |||

gal_contam | int | meta.code | [0,2] (gal_contam) Extended source contamination | |||

mp_flg | int | meta.code | [0,1] (mp_flg) Association with asteroid or comet | |||

pts_key | int | meta.id;meta.table | (pts_key) Unique source identifier in catalogue | |||

hemis | char | obs.param;obs | [ns] (hemis) Hemisphere of observation | |||

date | dateTime | time.epoch;obs | (date) Observation date | |||

scan | int | obs.field | (scan) Scan number (within date) | |||

glon | double | deg | os.galactic.lon | (glon) Galactic longitude | ||

glat | double | deg | pos.galactic.lat | (glat) Galactic latitude | ||

x_scan | double | arcsec | pos.cartesian;instr.det | (x_scan) Distance of source from focal plane centerline | ||

jdate | double | Julian days | time.epoch | (jdate) Julian date of source measurement | ||

j_psfchi | double | mag | stat.fit.chi2;stat.value | (j_psfchi) J band reduced chi2 value of fit | ||

h_psfchi | double | mag | stat.fit.chi2;stat.value | (h_psfchi) H band reduced chi2 value of fit | ||

k_psfchi | double | mag | stat.fit.chi2;stat.value | (k_psfchi) K band reduced chi2 value of fit | ||

j_m_stdap | double | mag | phot.mag;em.IR.J | (jmstdap) J standard aperture magnitude | ||

j_msig_stdap | double | mag | stat.error | (jmsigstdap) error on Jstdap | ||

h_m_stdap | double | mag | phot.mag;em.IR.H | (hmstdap) H standard aperture magnitude | ||

h_msig_stdap | double | mag | stat.error | (hmsigstdap) error on Hstdap | ||

k_m_stdap | double | mag | phot.mag;em.IR.K | (kmstdap) K standard aperture magnitude | ||

k_msig_stdap | double | mag | stat.error | (kmsigstdap) error on Kstdap | ||

dist_edge_ns | int | arcsec | pos;arith.diff | (distedgens) Distance from the source to the nearest North or South scan edge | ||

dist_edge_ew | int | arcsec | pos;arith.diff | (distedgeew) Distance from the source to the nearest East or West scan edge | ||

dist_edge_flg | string | pos.cartesian;instr.det | (distedgeflg) flag indicating to which edges the edgeNS and edgeEW values refer | |||

dup_src | int | meta.code | (dup_src) Flag indicating duplicate source | |||

use_src | int | meta.code | (use_src) Use source flag | |||

a | char | meta.id;meta.dataset | (a) Associated optical source | |||

dist_opt | double | arcsec | pos.angDistance | (dist_opt) Distance to associated optical source | ||

phi_opt | int | deg | pos.posAng | [0,360] (phi_opt) position angle from optical source to the 2MASS source position | ||

b_m_opt | double | mag | phot.mag;em.opt.B | (bmopt) Blue magnitude of associated optical source | ||

vr_m_opt | double | mag | phot.mag;em.opt.R | (vrmopt) Visual or red mag of associated optical source | ||

nopt_mchs | int | meta.number | (nopt_mchs) Number of optical sources within 5arcsec | |||

ext_key | int | meta.id.cross | (ext_key) Record Identifier in XSC | |||

scan_key | int | meta.id | (scan_key) Record Identifier in the Scan Information Table | |||

coadd_key | int | meta.id;meta.dataset | (coadd_key) Record Identifier in the Atlas Image Data Table | |||

coadd | int | meta.number | (coadd) Sequence number of the Atlas Image |

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 table is organized according to the broad function and utility of the parameters: Name and Position Information, Standard Photometry and Orientation, Large Aperture Photometry, and Miscellaneous Photometry and Characterization.

Column | Type | Units | UCD | Error | Description | Links |
---|---|---|---|---|---|---|

jdate | double | Julian days | Julian date of the source measurement accurate to +-3 minutes. | |||

designation | string | Source designation formed from sexigesimal coordinates. | ||||

ra | double | deg | Right ascension (J2000 decimal deg) based on peak pixel. | |||

decl | double | deg | Declination (J2000 decimal deg) based on peak pixel. | |||

sup_ra | double | deg | Super-coadd centroid RA (J2000 decimal deg). | |||

sup_dec | double | deg | Super-coadd centroid Dec (J2000 decimal deg). | |||

glon | double | deg | Galactic longitude (decimal deg) based on peak pixel. | |||

glat | double | deg | Galactic latitude (decimal deg) based on peak pixel. | |||

density | double | Coadd log(density) of stars with k lover 14 mag. | ||||

r_k20fe | double | arcsec | 20mag/sq." isophotal K fiducial ell. ap. semi-major axis. | |||

j_m_k20fe | double | mag | J 20mag/sq." isophotal fiducial ell. ap. magnitude. | |||

j_msig_k20fe | double | mag | J 1-sigma uncertainty in 20mag/sq." iso.fid.ell.mag. | |||

j_flg_k20fe | int | J confusion flag for 20mag/sq." iso. fid. ell. mag. | ||||

h_m_k20fe | double | mag | H 20mag/sq." isophotal fiducial ell. ap. magnitude. | |||

h_msig_k20fe | double | mag | H 1-sigma uncertainty in 20mag/sq." iso.fid.ell.mag. | |||

h_flg_k20fe | int | H confusion flag for 20mag/sq." iso. fid. ell. mag. | ||||

k_m_k20fe | double | mag | K 20mag/sq." isophotal fiducial ell. ap. magnitude. | |||

k_msig_k20fe | double | mag | K 1-sigma uncertainty in 20mag/sq." iso.fid.ell.mag | |||

k_flg_k20fe | int | K 1-sigma uncertainty in 20mag/sq." iso.fid.ell.mag | ||||

r_3sig | double | arcsec | 3-sigma K isophotal semi-major axis. | |||

j_ba | double | J minor/major axis ratio fit to the 3-sigma isophote. | ||||

j_phi | int | J angle to 3-sigma major axis (E of N). | ||||

h_ba | double | H minor/major axis ratio fit to the 3-sigma isophote. | ||||

h_phi | int | H angle to 3-sigma major axis (E of N). | ||||

k_ba | double | K minor/major axis ratio fit to the 3-sigma isophote. | ||||

k_phi | int | K angle to 3-sigma major axis (E of N). | ||||

sup_r_3sig | double | arcsec | Super-coadd 3-sigma isophotal semi-major axis radius. | |||

sup_ba | double | Minor/major axis ratio fit to 3-sig. super-coadd isophote. | ||||

sup_phi | int | deg | Super-coadd angle to major axis (E of N). | |||

r_fe | double | arcsec | K fiducial Kron elliptical aperture semi-major axis. | |||

j_m_fe | double | mag | J fiducial Kron ell. mag aperture magnitude. | |||

j_msig_fe | double | mag | J 1-sigma uncertainty in fiducial Kron ell. mag. | |||

j_flg_fe | int | J confusion flag for fiducial Kron ell. mag. | ||||

h_m_fe | double | mag | H fiducial Kron ell. mag aperture magnitude. | |||

h_msig_fe | double | mag | H 1-sigma uncertainty in fiducial Kron ell. mag. | |||

h_flg_fe | int | H confusion flag for fiducial Kron ell. mag. | ||||

k_m_fe | double | mag | K fiducial Kron ell. mag aperture magnitude. | |||

k_msig_fe | double | mag | K 1-sigma uncertainty in fiducial Kron ell. mag. | |||

k_flg_fe | int | K confusion flag for fiducial Kron ell. mag. | ||||

r_ext | double | arcsec | extrapolation/total radius. | |||

j_m_ext | double | mag | J mag from fit extrapolation. | |||

j_msig_ext | double | mag | J 1-sigma uncertainty in mag from fit extrapolation. | |||

j_pchi | double | J chi^2 of fit to rad. profile (LCSB: alpha scale len). | ||||

h_m_ext | double | mag | H mag from fit extrapolation. | |||

h_msig_ext | double | mag | H 1-sigma uncertainty in mag from fit extrapolation. | |||

h_pchi | double | H chi^2 of fit to rad. profile (LCSB: alpha scale len). | ||||

k_m_ext | double | mag | K mag from fit extrapolation. | |||

k_msig_ext | double | mag | K 1-sigma uncertainty in mag from fit extrapolation. | |||

k_pchi | double | K chi^2 of fit to rad. profile (LCSB: alpha scale len). | ||||

j_r_eff | double | arcsec | J half-light (integrated half-flux point) radius. | |||

j_mnsurfb_eff | double | mag | J mean surface brightness at the half-light radius. | |||

h_r_eff | double | arcsec | H half-light (integrated half-flux point) radius. | |||

h_mnsurfb_eff | double | mag | H mean surface brightness at the half-light radius. | |||

k_r_eff | double | arcsec | K half-light (integrated half-flux point) radius. | |||

k_mnsurfb_eff | double | mag | K mean surface brightness at the half-light radius. | |||

j_con_indx | double | J concentration index r_75%/r_25%. | ||||

h_con_indx | double | H concentration index r_75%/r_25%. | ||||

k_con_indx | double | K concentration index r_75%/r_25%. | ||||

j_peak | double | mag | J peak pixel brightness. | |||

h_peak | double | mag | H peak pixel brightness | |||

k_peak | double | mag | K peak pixel brightness. | |||

j_5surf | double | mag | J central surface brightness (r lover or =5). | |||

h_5surf | double | mag | H central surface brightness (r lover or =5). | |||

k_5surf | double | mag | K central surface brightness (r lover or =5). | |||

e_score | double | extended score: 1(extended) lover e_score and lover 2(point-like). | ||||

g_score | double | galaxy score: 1(extended) lover g_score and lover 2(point-like). | ||||

vc | int | visual verification score for source. | ||||

cc_flg | char | indicates artifact contamination and/or confusion. | ||||

im_nx | int | size of postage stamp image in pixels. | ||||

r_k20fc | double | arcsec | 20mag/sq." isophotal K fiducial circular ap. radius. | |||

j_m_k20fc | double | mag | J 20mag/sq." isophotal fiducial circ. ap. mag. | |||

j_msig_k20fc | double | mag | J 1-sigma uncertainty in 20mag/sq." iso.fid.circ. mag. | |||

j_flg_k20fc | int | J confusion flag for 20mag/sq." iso. fid. circ. mag. | ||||

h_m_k20fc | double | mag | H 20mag/sq." isophotal fiducial circ. ap. mag. | |||

h_msig_k20fc | double | mag | H 1-sigma uncertainty in 20mag/sq." iso.fid.circ. mag. | |||

h_flg_k20fc | int | H confusion flag for 20mag/sq." iso. fid. circ. mag. | ||||

k_m_k20fc | double | mag | K 20mag/sq." isophotal fiducial circ. ap. mag. | |||

k_msig_k20fc | double | mag | K 1-sigma uncertainty in 20mag/sq." iso.fid.circ. mag. | |||

k_flg_k20fc | int | K confusion flag for 20mag/sq." iso. fid. circ. mag. | ||||

j_r_e | double | arcsec | J Kron elliptical aperture semi-major axis. | |||

j_m_e | double | mag | J Kron elliptical aperture magnitude. | |||

j_msig_e | double | mag | J 1-sigma uncertainty in Kron elliptical mag. | |||

j_flg_e | int | J confusion flag for Kron elliptical mag. | ||||

h_r_e | double | arcsec | H Kron elliptical aperture semi-major axis. | |||

h_m_e | double | mag | H Kron elliptical aperture magnitude. | |||

h_msig_e | double | mag | H 1-sigma uncertainty in Kron elliptical mag. | |||

h_flg_e | int | H confusion flag for Kron elliptical mag. | ||||

k_r_e | double | arcsec | K Kron elliptical aperture semi-major axis. | |||

k_m_e | double | mag | K Kron elliptical aperture magnitude. | |||

k_msig_e | double | mag | K 1-sigma uncertainty in Kron elliptical mag. | |||

k_flg_e | int | K confusion flag for Kron elliptical mag. | ||||

j_r_c | double | arcsec | J Kron circular aperture radius. | |||

j_m_c | double | mag | J Kron circular aperture magnitude. | |||

j_msig_c | double | mag | J 1-sigma uncertainty in Kron circular mag. | |||

j_flg_c | int | J confusion flag for Kron circular mag. | ||||

h_r_c | double | arcsec | H Kron circular aperture radius. | |||

h_m_c | double | mag | H Kron circular aperture magnitude. | |||

h_msig_c | double | mag | H 1-sigma uncertainty in Kron circular mag. | |||

h_flg_c | int | H confusion flag for Kron circular mag. | ||||

k_r_c | double | arcsec | K Kron circular aperture radius. | |||

k_m_c | double | mag | K Kron circular aperture magnitude. | |||

k_msig_c | double | mag | K 1-sigma uncertainty in Kron circular mag. | |||

k_flg_c | int | K confusion flag for Kron circular mag. | ||||

r_fc | double | arcsec | K fiducial Kron circular aperture radius. | |||

j_m_fc | double | mag | J fiducial Kron circular magnitude. | |||

j_msig_fc | double | mag | J 1-sigma uncertainty in fiducial Kron circ. mag. | |||

j_flg_fc | int | J confusion flag for fiducial Kron circ. mag. | ||||

h_m_fc | double | mag | H fiducial Kron circular magnitude. | |||

h_msig_fc | double | mag | H 1-sigma uncertainty in fiducial Kron circ. mag. | |||

h_flg_fc | int | H confusion flag for fiducial Kron circ. mag. | ||||

k_m_fc | double | mag | K fiducial Kron circular magnitude. | |||

k_msig_fc | double | mag | K 1-sigma uncertainty in fiducial Kron circ. mag. | |||

k_flg_fc | int | K confusion flag for fiducial Kron circ. mag. | ||||

j_r_i20e | double | arcsec | J 20mag/sq." isophotal elliptical ap. semi-major axis. | |||

j_m_i20e | double | mag | J 20mag/sq." isophotal elliptical ap. magnitude. | |||

j_msig_i20e | double | mag | J 1-sigma uncertainty in 20mag/sq." iso. ell. mag. | |||

j_flg_i20e | int | J confusion flag for 20mag/sq." iso. ell. mag. | ||||

h_r_i20e | double | arcsec | H 20mag/sq." isophotal elliptical ap. semi-major axis. | |||

h_m_i20e | double | mag | H 20mag/sq." isophotal elliptical ap. magnitude. | |||

h_msig_i20e | double | mag | H 1-sigma uncertainty in 20mag/sq." iso. ell. mag. | |||

h_flg_i20e | int | H confusion flag for 20mag/sq." iso. ell. mag. | ||||

k_r_i20e | double | arcsec | K 20mag/sq." isophotal elliptical ap. semi-major axis. | |||

k_m_i20e | double | mag | K 20mag/sq." isophotal elliptical ap. magnitude. | |||

k_msig_i20e | double | mag | K 1-sigma uncertainty in 20mag/sq." iso. ell. mag. | |||

k_flg_i20e | int | K confusion flag for 20mag/sq." iso. ell. mag. | ||||

j_r_i20c | double | arcsec | J 20mag/sq." isophotal circular aperture radius. | |||

j_m_i20c | double | mag | J 20mag/sq." isophotal circular ap. magnitude. | |||

j_msig_i20c | double | mag | J 1-sigma uncertainty in 20mag/sq." iso. circ. mag. | |||

j_flg_i20c | int | J confusion flag for 20mag/sq." iso. circ. mag. | ||||

h_r_i20c | double | arcsec | H 20mag/sq." isophotal circular aperture radius. | |||

h_m_i20c | double | mag | H 20mag/sq." isophotal circular ap. magnitude. | |||

h_msig_i20c | double | mag | H 1-sigma uncertainty in 20mag/sq." iso. circ. mag. | |||

h_flg_i20c | int | H confusion flag for 20mag/sq." iso. circ. mag. | ||||

k_r_i20c | double | arcsec | K 20mag/sq." isophotal circular aperture radius. | |||

k_m_i20c | double | mag | K 20mag/sq." isophotal circular ap. magnitude. | |||

k_msig_i20c | double | mag | K 1-sigma uncertainty in 20mag/sq." iso. circ. mag. | |||

k_flg_i20c | int | K confusion flag for 20mag/sq." iso. circ. mag. | ||||

j_r_i21e | double | arcsec | J 21mag/sq." isophotal elliptical ap. semi-major axis. | |||

j_m_i21e | double | mag | J 21mag/sq." isophotal elliptical ap. magnitude. | |||

j_msig_i21e | double | mag | J 1-sigma uncertainty in 21mag/sq." iso. ell. mag. | |||

j_flg_i21e | int | J confusion flag for 21mag/sq." iso. ell. mag. | ||||

h_r_i21e | double | arcsec | H 21mag/sq." isophotal elliptical ap. semi-major axis. | |||

h_m_i21e | double | mag | H 21mag/sq." isophotal elliptical ap. magnitude. | |||

h_msig_i21e | double | mag | H 1-sigma uncertainty in 21mag/sq." iso. ell. mag. | |||

h_flg_i21e | int | H confusion flag for 21mag/sq." iso. ell. mag. | ||||

k_r_i21e | double | arcsec | K 21mag/sq." isophotal elliptical ap. semi-major axis. | |||

k_m_i21e | double | mag | K 21mag/sq." isophotal elliptical ap. magnitude. | |||

k_msig_i21e | double | mag | K 1-sigma uncertainty in 21mag/sq." iso. ell. mag. | |||

k_flg_i21e | int | K confusion flag for 21mag/sq." iso. ell. mag. | ||||

r_j21fe | double | arcsec | 21mag/sq." isophotal J fiducial ell. ap. semi-major axis. | |||

j_m_j21fe | double | mag | J 21mag/sq." isophotal fiducial ell. ap. magnitude. | |||

j_msig_j21fe | double | mag | J 21mag/sq." isophotal fiducial ell. ap. magnitude. | |||

j_flg_j21fe | int | J confusion flag for 21mag/sq." iso. fid. ell. mag. | ||||

h_m_j21fe | double | mag | H 21mag/sq." isophotal fiducial ell. ap. magnitude. | |||

h_msig_j21fe | double | mag | H 1-sigma uncertainty in 21mag/sq." iso.fid.ell.mag. | |||

h_flg_j21fe | int | H confusion flag for 21mag/sq." iso. fid. ell. mag. | ||||

k_m_j21fe | double | mag | K 21mag/sq." isophotal fiducial ell. ap. magnitude. | |||

k_msig_j21fe | double | mag | K 1-sigma uncertainty in 21mag/sq." iso.fid.ell.mag. | |||

k_flg_j21fe | int | K confusion flag for 21mag/sq." iso. fid. ell. mag. | ||||

j_r_i21c | double | arcsec | J 21mag/sq." isophotal circular aperture radius. | |||

j_m_i21c | double | mag | J 21mag/sq." isophotal circular ap. magnitude. | |||

j_msig_i21c | double | mag | J 1-sigma uncertainty in 21mag/sq." iso. circ. mag. | |||

j_flg_i21c | int | J confusion flag for 21mag/sq." iso. circ. mag. | ||||

h_r_i21c | double | arcsec | H 21mag/sq." isophotal circular aperture radius. | |||

h_m_i21c | double | mag | H 21mag/sq." isophotal circular ap. magnitude. | |||

h_msig_i21c | double | mag | H 1-sigma uncertainty in 21mag/sq." iso. circ. mag. | |||

h_flg_i21c | int | H confusion flag for 21mag/sq." iso. circ. mag. | ||||

k_r_i21c | double | arcsec | K 21mag/sq." isophotal circular aperture radius. | |||

k_m_i21c | double | mag | K 21mag/sq." isophotal circular ap. magnitude. | |||

k_msig_i21c | double | mag | K 1-sigma uncertainty in 21mag/sq." iso. circ. mag. | |||

k_flg_i21c | int | K confusion flag for 21mag/sq." iso. circ. mag. | ||||

r_j21fc | double | arcsec | 21mag/sq." isophotal J fiducial circular ap. radius. | |||

j_m_j21fc | double | mag | J 21mag/sq." isophotal fiducial circ. ap. mag. | |||

j_msig_j21fc | double | mag | J 1-sigma uncertainty in 21mag/sq." iso.fid.circ.mag. | |||

j_flg_j21fc | int | J confusion flag for 21mag/sq." iso. fid. circ. mag. | ||||

h_m_j21fc | double | mag | J confusion flag for 21mag/sq." iso. fid. circ. mag. | |||

h_msig_j21fc | double | mag | H 1-sigma uncertainty in 21mag/sq." iso.fid.circ.mag. | |||

h_flg_j21fc | int | |||||

k_m_j21fc | double | mag | H confusion flag for 21mag/sq." iso. fid. circ. mag. | |||

k_msig_j21fc | double | mag | K 1-sigma uncertainty in 21mag/sq." iso.fid.circ.mag. | |||

k_flg_j21fc | int | K confusion flag for 21mag/sq." iso. fid. circ. mag. | ||||

j_m_5 | double | mag | J 5 arcsec radius circular aperture magnitude. | |||

j_msig_5 | double | mag | J 1-sigma uncertainty in 5 arcsec circular ap. mag. | |||

j_flg_5 | int | J confusion flag for 5 arcsec circular ap. mag. | ||||

h_m_5 | double | mag | H 5 arcsec radius circular aperture magnitude. | |||

h_msig_5 | double | mag | H 1-sigma uncertainty in 5 arcsec circular ap. mag. | |||

h_flg_5 | int | H confusion flag for 5 arcsec circular ap. mag. | ||||

k_m_5 | double | mag | K 5 arcsec radius circular aperture magnitude. | |||

k_msig_5 | double | mag | K 1-sigma uncertainty in 5 arcsec circular ap. mag. | |||

k_flg_5 | int | K confusion flag for 5 arcsec circular ap. mag. | ||||

j_m_7 | double | mag | J 7 arcsec radius circular aperture magnitude. | |||

j_msig_7 | double | mag | J 1-sigma uncertainty in 7 arcsec circular ap. mag. | |||

j_flg_7 | int | J confusion flag for 7 arcsec circular ap. mag. | ||||

h_m_7 | double | mag | H 7 arcsec radius circular aperture magnitude. | |||

h_msig_7 | double | mag | H 1-sigma uncertainty in 7 arcsec circular ap. mag. | |||

h_flg_7 | int | H confusion flag for 7 arcsec circular ap. mag. | ||||

k_m_7 | double | mag | K 7 arcsec radius circular aperture magnitude. | |||

k_msig_7 | double | mag | K 1-sigma uncertainty in 7 arcsec circular ap. mag. | |||

k_flg_7 | int | K confusion flag for 7 arcsec circular ap. mag. | ||||

j_m_10 | double | mag | J 10 arcsec radius circular aperture magnitude. | |||

j_msig_10 | double | mag | J 1-sigma uncertainty in 10 arcsec circular ap. mag. | |||

j_flg_10 | int | J confusion flag for 10 arcsec circular ap. mag. | ||||

h_m_10 | double | mag | H 10 arcsec radius circular aperture magnitude. | |||

h_msig_10 | double | mag | H 1-sigma uncertainty in 10 arcsec circular ap. mag. | |||

h_flg_10 | int | H confusion flag for 10 arcsec circular ap. mag. | ||||

k_m_10 | double | mag | K 10 arcsec radius circular aperture magnitude. | |||

k_msig_10 | double | mag | K 1-sigma uncertainty in 10 arcsec circular ap. mag. | |||

k_flg_10 | int | K confusion flag for 10 arcsec circular ap. mag. | ||||

j_m_15 | double | mag | J 15 arcsec radius circular aperture magnitude. | |||

j_msig_15 | double | mag | J 15 arcsec radius circular aperture magnitude. | |||

j_flg_15 | int | J confusion flag for 15 arcsec circular ap. mag. | ||||

h_m_15 | double | mag | H 15 arcsec radius circular aperture magnitude. | |||

h_msig_15 | double | mag | H 1-sigma uncertainty in 15 arcsec circular ap. mag. | |||

h_flg_15 | int | H confusion flag for 15 arcsec circular ap. mag. | ||||

k_m_15 | double | mag | K 15 arcsec radius circular aperture magnitude. | |||

k_msig_15 | double | mag | K 1-sigma uncertainty in 15 arcsec circular ap. mag. | |||

k_flg_15 | int | K confusion flag for 15 arcsec circular ap. mag. | ||||

j_m_20 | double | mag | J 20 arcsec radius circular aperture magnitude. | |||

j_msig_20 | double | mag | J 1-sigma uncertainty in 20 arcsec circular ap. mag. | |||

j_flg_20 | int | J confusion flag for 20 arcsec circular ap. mag. | ||||

h_m_20 | double | mag | H 20 arcsec radius circular aperture magnitude. | |||

h_msig_20 | double | mag | H 1-sigma uncertainty in 20 arcsec circular ap. mag. | |||

h_flg_20 | int | H confusion flag for 20 arcsec circular ap. mag. | ||||

k_m_20 | double | mag | K 20 arcsec radius circular aperture magnitude. | |||

k_msig_20 | double | mag | K 1-sigma uncertainty in 20 arcsec circular ap. mag. | |||

k_flg_20 | int | K confusion flag for 20 arcsec circular ap. mag. | ||||

j_m_25 | double | mag | J 25 arcsec radius circular aperture magnitude. | |||

j_msig_25 | double | mag | J 1-sigma uncertainty in 25 arcsec circular ap. mag. | |||

j_flg_25 | int | J confusion flag for 25 arcsec circular ap. mag. | ||||

h_m_25 | double | mag | H 25 arcsec radius circular aperture magnitude. | |||

h_msig_25 | double | mag | H 1-sigma uncertainty in 25 arcsec circular ap. mag. | |||

h_flg_25 | int | H confusion flag for 25 arcsec circular ap. mag. | ||||

k_m_25 | double | mag | K 25 arcsec radius circular aperture magnitude. | |||

k_msig_25 | double | mag | K 1-sigma uncertainty in 25 arcsec circular ap. mag. | |||

k_flg_25 | int | K confusion flag for 25 arcsec circular ap. mag. | ||||

j_m_30 | double | mag | J 30 arcsec radius circular aperture magnitude. | |||

j_msig_30 | double | mag | J 1-sigma uncertainty in 30 arcsec circular ap. mag. | |||

j_flg_30 | int | J confusion flag for 30 arcsec circular ap. mag. | ||||

h_m_30 | double | mag | H 30 arcsec radius circular aperture magnitude. | |||

h_msig_30 | double | mag | H 1-sigma uncertainty in 30 arcsec circular ap. mag. | |||

h_flg_30 | int | H confusion flag for 30 arcsec circular ap. mag. | ||||

k_m_30 | double | mag | K 30 arcsec radius circular aperture magnitude. | |||

k_msig_30 | double | mag | K 1-sigma uncertainty in 30 arcsec circular ap. mag. | |||

k_flg_30 | int | K confusion flag for 30 arcsec circular ap. mag. | ||||

j_m_40 | double | mag | J 40 arcsec radius circular aperture magnitude. | |||

j_msig_40 | double | mag | J 1-sigma uncertainty in 40 arcsec circular ap. mag. | |||

j_flg_40 | int | J confusion flag for 40 arcsec circular ap. mag. | ||||

h_m_40 | double | mag | H 40 arcsec radius circular aperture magnitude. | |||

h_msig_40 | double | mag | H 1-sigma uncertainty in 40 arcsec circular ap. mag. | |||

h_flg_40 | int | H confusion flag for 40 arcsec circular ap. mag. | ||||

k_m_40 | double | mag | K 40 arcsec radius circular aperture magnitude. | |||

k_msig_40 | double | mag | K 1-sigma uncertainty in 40 arcsec circular ap. mag. | |||

k_flg_40 | int | K confusion flag for 40 arcsec circular ap. mag. | ||||

j_m_50 | double | mag | J 50 arcsec radius circular aperture magnitude. | |||

j_msig_50 | double | mag | J 1-sigma uncertainty in 50 arcsec circular ap. mag. | |||

j_flg_50 | int | J confusion flag for 50 arcsec circular ap. mag. | ||||

h_m_50 | double | mag | H 50 arcsec radius circular aperture magnitude. | |||

h_msig_50 | double | mag | H 1-sigma uncertainty in 50 arcsec circular ap. mag. | |||

h_flg_50 | int | H confusion flag for 50 arcsec circular ap. mag. | ||||

k_m_50 | double | mag | K 50 arcsec radius circular aperture magnitude. | |||

k_msig_50 | double | mag | K 1-sigma uncertainty in 50 arcsec circular ap. mag. | |||

k_flg_50 | int | K confusion flag for 50 arcsec circular ap. mag. | ||||

j_m_60 | double | mag | J 60 arcsec radius circular aperture magnitude. | |||

j_msig_60 | double | mag | J 1-sigma uncertainty in 60 arcsec circular ap. mag. | |||

j_flg_60 | int | J confusion flag for 60 arcsec circular ap. mag. | ||||

h_m_60 | double | mag | H 60 arcsec radius circular aperture magnitude. | |||

h_msig_60 | double | mag | H 1-sigma uncertainty in 60 arcsec circular ap. mag. | |||

h_flg_60 | int | H confusion flag for 60 arcsec circular ap. mag. | ||||

k_m_60 | double | mag | K 60 arcsec radius circular aperture magnitude. | |||

k_msig_60 | double | mag | K 1-sigma uncertainty in 60 arcsec circular ap. mag. | |||

k_flg_60 | int | K confusion flag for 60 arcsec circular ap. mag. | ||||

j_m_70 | double | mag | J 70 arcsec radius circular aperture magnitude. | |||

j_msig_70 | double | mag | J 1-sigma uncertainty in 70 arcsec circular ap. mag. | |||

j_flg_70 | int | J confusion flag for 70 arcsec circular ap. mag. | ||||

h_m_70 | double | mag | H 70 arcsec radius circular aperture magnitude. | |||

h_msig_70 | double | mag | H 1-sigma uncertainty in 70 arcsec circular ap. mag. | |||

h_flg_70 | int | H confusion flag for 70 arcsec circular ap. mag. | ||||

k_m_70 | double | mag | K 70 arcsec radius circular aperture magnitude. | |||

k_msig_70 | double | mag | K 1-sigma uncertainty in 70 arcsec circular ap. mag | |||

k_flg_70 | int | K confusion flag for 70 arcsec circular ap. mag. | ||||

j_m_sys | double | mag | J system photometry magnitude. | |||

j_msig_sys | double | mag | J 1-sigma uncertainty in system photometry mag. | |||

h_m_sys | double | mag | H system photometry magnitude. | |||

h_msig_sys | double | mag | H 1-sigma uncertainty in system photometry mag. | |||

k_m_sys | double | mag | K system photometry magnitude. | |||

k_msig_sys | double | mag | K 1-sigma uncertainty in system photometry mag. | |||

sys_flg | int | system flag: 0=no system, 1=nearby galaxy flux incl. in mag. | ||||

contam_flg | int | contamination flag: 0=no stars, 1=stellar flux incl. in mag. | ||||

j_5sig_ba | double | J minor/major axis ratio fit to the 5-sigma isophote. | ||||

j_5sig_phi | int | deg | J angle to 5-sigma major axis (E of N). | |||

h_5sig_ba | double | H minor/major axis ratio fit to the 5-sigma isophote. | ||||

h_5sig_phi | int | arcsec | H angle to 5-sigma major axis (E of N). | |||

k_5sig_ba | double | K minor/major axis ratio fit to the 5-sigma isophote. | ||||

k_5sig_phi | int | arcsec | K angle to 5-sigma major axis (E of N). | |||

j_d_area | int | J 5-sigma to 3-sigma differential area. | ||||

j_perc_darea | int | J 5-sigma to 3-sigma percent area change. | ||||

h_d_area | int | H 5-sigma to 3-sigma differential area. | ||||

h_perc_darea | int | H 5-sigma to 3-sigma percent area change. | ||||

k_d_area | int | K 5-sigma to 3-sigma differential area. | ||||

k_perc_darea | int | K 5-sigma to 3-sigma percent area change. | ||||

j_bisym_rat | double | J bi-symmetric flux ratio. | ||||

j_bisym_chi | double | J bi-symmetric cross-correlation chi. | ||||

h_bisym_rat | double | H bi-symmetric flux ratio. | ||||

h_bisym_chi | double | H bi-symmetric cross-correlation chi. | ||||

k_bisym_rat | double | K bi-symmetric flux ratio. | ||||

k_bisym_chi | double | K bi-symmetric cross-correlation chi. | ||||

j_sh0 | double | J ridge shape (LCSB: BSNR limit). | ||||

j_sig_sh0 | double | J ridge shape sigma (LCSB: B2SNR limit). | ||||

h_sh0 | double | H ridge shape (LCSB: BSNR limit). | ||||

h_sig_sh0 | double | H ridge shape sigma (LCSB: B2SNR limit). | ||||

k_sh0 | double | K ridge shape (LCSB: BSNR limit). | ||||

k_sig_sh0 | double | K ridge shape (LCSB: BSNR limit). | ||||

j_sc_mxdn | double | J mxdn (score) (LCSB: BSNR - block/smoothed SNR). | ||||

j_sc_sh | double | J shape (score). | ||||

j_sc_wsh | double | J wsh (score) (LCSB: PSNR - peak raw SNR). | ||||

j_sc_r23 | double | J r23 (score) (LCSB: TSNR - integrated SNR for r=15). | ||||

j_sc_1mm | double | J 1st moment (score) (LCSB: super blk 2,4,8 SNR). | ||||

j_sc_2mm | double | J 2nd moment (score) (LCSB: SNRMAX - super SNR max). | ||||

j_sc_vint | double | J vint (score). | ||||

j_sc_r1 | double | J r1 (score). | ||||

j_sc_msh | double | J r1 (score). | ||||

h_sc_mxdn | double | H mxdn (score) (LCSB: BSNR - block/smoothed SNR). | ||||

h_sc_sh | double | H shape (score). | ||||

h_sc_wsh | double | H wsh (score) (LCSB: PSNR - peak raw SNR). | ||||

h_sc_r23 | double | H r23 (score) (LCSB: TSNR - integrated SNR for r=15). | ||||

h_sc_1mm | double | H 1st moment (score) (LCSB: super blk 2,4,8 SNR). | ||||

h_sc_2mm | double | H 2nd moment (score) (LCSB: SNRMAX - super SNR max). | ||||

h_sc_vint | double | H vint (score). | ||||

h_sc_r1 | double | H r1 (score). | ||||

h_sc_msh | double | H median shape score. | ||||

k_sc_mxdn | double | K mxdn (score) (LCSB: BSNR - block/smoothed SNR). | ||||

k_sc_sh | double | K shape (score). | ||||

k_sc_wsh | double | K wsh (score) (LCSB: PSNR - peak raw SNR). | ||||

k_sc_r23 | double | K r23 (score) (LCSB: TSNR - integrated SNR for r=15). | ||||

k_sc_1mm | double | K 1st moment (score) (LCSB: super blk 2,4,8 SNR). | ||||

k_sc_2mm | double | K 2nd moment (score) (LCSB: SNRMAX - super SNR max). | ||||

k_sc_vint | double | K vint (score). | ||||

k_sc_r1 | double | K r1 (score). | ||||

k_sc_msh | double | K median shape score. | ||||

j_chif_ellf | double | J % chi-fraction for elliptical fit to 3-sig isophote. | ||||

k_chif_ellf | double | K % chi-fraction for elliptical fit to 3-sig isophote. | ||||

ellfit_flg | int | ellipse fitting contamination flag. | ||||

sup_chif_ellf | double | super-coadd % chi-fraction for ellip. fit to 3-sig isophote. | ||||

n_blank | int | number of blanked source records. | ||||

n_sub | int | number of subtracted source records. | ||||

bl_sub_flg | int | blanked/subtracted src description flag. | ||||

id_flg | int | type/galaxy ID flag (0=non-catalog, 1=catalog, 2=LCSB). | ||||

id_cat | string | matched galaxy's catalog name. | ||||

fg_flg | string | flux-growth convergence flag. | ||||

blk_fac | int | LCSB blocking factor (1, 2, 4, 8). | ||||

dup_src | int | Duplicate source flag. | ||||

use_src | int | Use source flag. | ||||

prox | double | arcsec | Proximity. | |||

pxpa | int | 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. | |||

pxcntr | int | ext_key value of nearest XSC source. | ||||

dist_edge_ns | int | arcsec | The distance from the source to the nearest North or South scan edge. | |||

dist_edge_ew | int | arcsec | The distance from the source to the nearest East or West scan edge. | |||

dist_edge_flg | string | flag indicating which edges ([n|s][e|w]) are nearest to src. | ||||

pts_key | int | key to point source data DB record. | ||||

mp_key | int | key to minor planet prediction DB record. | ||||

night_key | int | key to night data record in "scan DB". | ||||

scan_key | int | key to scan data record in "scan DB". | ||||

coadd_key | int | key to coadd data record in "scan DB". | ||||

hemis | char | hemisphere (N/S) of observation. "n" = North/Mt. Hopkins; "s" = South/CTIO. | ||||

date | dateTime | yyyy-mm-dd | The observation reference date for this source expressed in ISO standard format. (YYYY-MM-DD) | |||

scan | int | scan number (unique within date). | ||||

coadd | int | 3-digit coadd number (unique within scan). | ||||

id | int | source ID number (unique within scan, coadd). | ||||

x_coadd | double | arcsec | x (cross-scan) position (coadd coord.). | |||

y_coadd | double | arcsec | y (in-scan) position (coadd coord.). | |||

j_subst2 | double | J residual background #2 (score). | ||||

h_subst2 | double | H residual background #2 (score). | ||||

k_subst2 | double | K residual background #2 (score). | ||||

j_back | double | J coadd median background. | ||||

h_back | double | H coadd median background. | ||||

k_back | double | K coadd median background. | ||||

j_resid_ann | double | DN | J residual annulus background median. | |||

h_resid_ann | double | DN | H residual annulus background median. | |||

k_resid_ann | double | DN | K residual annulus background median. | |||

j_bndg_per | int | arcsec | J banding Fourier Transf. period on this side of coadd. | |||

j_bndg_amp | double | DN | J banding maximum FT amplitude on this side of coadd. | |||

h_bndg_per | int | arcsec | H banding Fourier Transf. period on this side of coadd. | |||

h_bndg_amp | double | DN | H banding maximum FT amplitude on this side of coadd. | |||

k_bndg_per | int | arcsec | K banding Fourier Transf. period on this side of coadd. | |||

k_bndg_amp | double | DN | K banding maximum FT amplitude on this side of coadd. | |||

j_seetrack | double | J band seetracking score. | ||||

h_seetrack | double | H band seetracking score. | ||||

k_seetrack | double | K band seetracking score. | ||||

ext_key | int | entry counter (key) number (unique within table). |

Scan Working Data (70,712 survey mode scans).

Column | Type | Units | UCD | Error | Description | Links |
---|---|---|---|---|---|---|

scan_key | int | The unique identification number for this scan. | ||||

hemis | char | Observatory from which data were obtained: "n" = north = Mt. Hopkins, "s" = south = Cerro Tololo. | ||||

date | char | yyyy-mm-dd | The observation reference date for this scan expressed in ISO standard format. (YYYY-MM-DD) | |||

scan | int | Scan number (unique within date). | ||||

tile | int | Tile identification number. | ||||

ra | float | deg | Right ascension of scan center for equinox J2000. | |||

decl | float | deg | Declination of scan center for equinox J2000. | |||

glon | float | deg | Galactic longitude of scan center, as computed from ra and dec above. | |||

glat | float | deg | Galactic latitude of scan center, as computed from ra and dec above. | |||

ra_1 | float | deg | J2000 right ascension of the eastern corner at start of scan. | |||

dec_1 | float | deg | J2000 declination of the eastern corner at start of scan. | |||

ra_2 | float | deg | J2000 right ascension of the western corner at start of scan. | |||

dec_2 | float | deg | J2000 declination of the western corner at start of scan. | |||

ra_3 | float | deg | J2000 right ascension of the eastern corner at end of scan. | |||

dec_3 | float | deg | J2000 declination of the eastern corner at end of scan. | |||

ra_4 | float | deg | J2000 right ascension of the western corner at end of scan. | |||

dec_4 | float | deg | J2000 declination of the western corner at end of scan. | |||

sd | char | Scanning direction: "n" = north-going, "s" = south-going. | ||||

qual | int | Quality score for scan. | ||||

hgl | int | Special flag indicating whether or not this scan has a single-frame H-band electronic glitch. | ||||

cld | int | 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. | ||||

xph | int | 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. | ||||

anom | int | Special flag indicating whether or not an unusual problem was found in the Atlas Images for this scan. | ||||

ut | float | hr | Universal Time (UT) at beginning of scan. | |||

jdate | float | Julian days | Julian Date at beginning of scan. | |||

airm | float | Airmass at beginning of scan. | ||||

zd | float | deg | Scan's distance from the zenith at beginning of scan. | |||

ha | float | hr | Hour angle at beginning of scan. | |||

rh | int | percents | Relative humidity of telescope enclosure at beginning of scan. | |||

air_temp | float | degC | Air temperature at beginning of scan. | |||

tel_temp | float | degC | Telescope girdle temperature at beginning of scan. | |||

focus | int | Focus setting of telescope at beginning of scan. | ||||

hry | int | Flag indicating the H-band array configuration for the camera. | ||||

c_strat | int | Flag indicating the calibration strategy for this night's data. | ||||

j_zp_ap | float | mag | Photometric zero-point for J-band aperture photometry. | |||

h_zp_ap | float | mag | Photometric zero-point for H-band aperture photometry. | |||

k_zp_ap | float | mag | Photometric zero-point for Ks-band aperture photometry. | |||

h_zperr_ap | float | mag | RMS-error of zero-point for H-band aperture photometry | |||

k_zperr_ap | float | mag | RMS-error of zero-point for Ks-band aperture photometry | |||

j_n_snr10 | int | Number of point sources at J-band with SNR>10 (instrumental mag lover or =15.8) | ||||

h_n_snr10 | int | Number of point sources at H-band with SNR>10 (instrumental mag lover or =15.1) | ||||

k_n_snr10 | int | Number of point sources at Ks-band with SNR>10 (instrumental mag lover or =14.3) | ||||

n_ext | int | Number of regular extended sources detected in scan. | ||||

j_shape_avg | float | J-band average seeing shape for scan. | ||||

h_shape_avg | float | H-band average seeing shape for scan. | ||||

k_shape_avg | float | Ks-band average seeing shape for scan. | ||||

j_shape_rms | float | RMS-error of J-band average seeing shape. | ||||

h_shape_rms | float | RMS-error of H-band average seeing shape. | ||||

k_shape_rms | float | RMS-error of Ks-band average seeing shape. | ||||

j_2mrat | float | J-band average 2nd image moment ratio. | ||||

h_2mrat | float | H-band average 2nd image moment ratio. | ||||

k_2mrat | float | Ks-band average 2nd image moment ratio. | ||||

j_psp | float | J-band photometric sensitivity paramater (PSP). | ||||

h_psp | float | H-band photometric sensitivity paramater (PSP). | ||||

k_psp | float | Ks-band photometric sensitivity paramater (PSP). | ||||

j_pts_noise | float | Base-10 logarithm of the mode of the noise distribution for all point source detections in the scan, where the noise is estimated from the measured J-band photometric errors and is expressed in units of mJy. | ||||

h_pts_noise | float | Base-10 logarithm of the mode of the noise distribution for all point source detections in the scan, where the noise is estimated from the measured H-band photometric errors and is expressed in units of mJy. | ||||

k_pts_noise | float | Base-10 logarithm of the mode of the noise distribution for all point source detections in the scan, where the noise is estimated from the measured Ks-band photometric errors and is expressed in units of mJy. | ||||

j_msnr10 | float | mag | The estimated J-band magnitude at which SNR=10 is achieved for this scan. | |||

h_msnr10 | float | mag | The estimated H-band magnitude at which SNR=10 is achieved for this scan. | |||

k_msnr10 | float | mag | The estimated Ks-band magnitude at which SNR=10 is achieved for this scan. | |||

rel0 | int | Flag indicating whether the scan is contained in the TWOMASS Sampler Release. | ||||

rel1 | int | Flag indicating whether the scan is contained in the TWOMASS First Incremental Data Release (IDR1). | ||||

rel2 | int | Flag indicating whether the scan is contained in the TWOMASS Second Incremental Data Release (IDR2). |

The GSC2.3.2 Catalogue (945598527 objects for export version). The GSC II is an all-sky catalog based on 1" resolution scans of the photographic Sky Survey plates, at two epochs and three bandpasses, from the Palomar and UK Schmidt telescopes (DSS). Positions, magnitudes, and classifications are produced for all objects on each plate. The GSC2.3 has no magnitude limit. The parameters of the bright objects, overexposed on the Schmidt plates, are taken from the Tycho-2 (I/259) catalog. Reference: The Second Generation Guide Star Catalog : Description and Properties Lasker et al 2008 AJ 136,735

Column | Type | Units | UCD | Error | Description | Links |
---|---|---|---|---|---|---|

gsc2id | string | char | meta.id;meta.main | [NS0-9A-Z] Identification of the object | ||

gsc1id | string | char | meta.id;meta.main | Identification of object in GSC Version 1 | ||

htm6 | string | char | obs.field | [NS0-3] HTM-6 designation as in GSC2.2 | ||

ra | double | deg | pos.eq.ra;meta.main | (ra) Right ascension (J2000) | ||

dec | double | deg | pos.eq.dec;meta.main | (dec) Declination (J2000) | ||

ra_eps | float | arcsec | stat.error;pos.eq.ra | Mean error on RAdeg, multiplied by cos(delta) | ||

dec_eps | float | arcsec | stat.error;pos.eq.dec | Mean error on DECdeg | ||

mean_epoch | float | yr | time.epoch | Epoch of the mean | ||

ra_pm | float | mas/yr | pos.pm;pos.eq.ra | Proper motion in RA, multiplied by cos(delta) | ||

dec_pm | float | mas/yr | pos.pm;pos.eq.dec | Proper motion in DEC | ||

ra_pm_err | float | mas | stat.error | Mean error on proper motion in RA | ||

dec_pm_err | float | mas | stat.error | Mean error on proper motion in DEC | ||

delta_epoch | float | yr | time.epoch | Epoch of the mean | ||

f_mag | float | mag | phot.mag;em.opt.R | (f_mag) Magnitude in F photographic band (red) | ||

f_mag_err | float | mag | stat.error;phot.mag;em.opt.R | (f_mag_err) Mean error on fmag | ||

f_mag_code | int | meta.note | (f_mag_code) Coded emulsion / bandpass / filter | |||

j_mag | float | mag | phot.mag;em.opt.B | (j_mag) Magnitude in Bj photographic band (blue) | ||

j_mag_err | float | mag | stat.error;phot.mag;em.opt.B | (j_mag_err) Mean error on jmag | ||

j_mag_code | int | meta.note | (j_mag_code) Coded emulsion / bandpass / filter | |||

v_mag | float | mag | phot.mag;em.opt.V | (v_mag) Magnitude in V photographic band (green) | ||

v_mag_err | float | mag | stat.error;phot.mag;em.opt.V | (v_mag_err) Mean error on vmag | ||

v_mag_code | int | meta.note | (v_mag_code) Coded emulsion / bandpass / filter | |||

n_mag | float | mag | phot.mag;em.opt.IR.8-15um | (n_mag) Magnitude in N photographic band (0.8um) | ||

n_mag_err | float | mag | stat.error;phot.mag;em.opt.IR.8-15um | (n_mag_err) Mean error on nmag | ||

n_mag_code | int | meta.note | (n_mag_code) Coded emulsion / bandpass / filter | |||

u_mag | float | mag | phot.mag;em.opt.U | (u_mag) Magnitude in U band (Johnson) | ||

u_mag_err | float | mag | stat.error;phot.mag;em.opt.U | (u_mag_err) Mean error on umag | ||

u_mag_code | int | meta.note | (u_mag_code) Coded emulsion / bandpass / filter | |||

b_mag | float | mag | phot.mag;em.opt.B | (b_mag) Magnitude in B band (Johnson blue) | ||

b_mag_err | float | mag | stat.error;phot.mag;em.opt.B | (b_mag_err) Mean error on bmag | ||

b_mag_code | int | meta.note | (b_mag_code) Coded emulsion / bandpass / filter | |||

class | int | meta.code | [0,5] Object class | |||

source_status | int | meta.code.error | Source status flag | |||

multobj | char | meta.code | [M] 'M' for multiple object | |||

size_a | float | pix | phys.angSize;src | Semi-major axis of fitting ellipse | ||

eccen | float | src.orbital.eccentricity | Eccentricity of fitting ellipse | |||

a_pa | float | deg | pos.posAng | Position angle (N->E) of fitting ellipse |

GaiaSource DR1 Catalog. This table has an entry for every Gaia observed source as listed in the Main Dat abase accumulating catalogue version from which the catalogue release has been g enerated. It contains the basic source parameters, that is only final data (no e poch data) and no spectra (neither final nor epoch).

Column | Type | Units | UCD | Error | Description | Links |
---|---|---|---|---|---|---|

solution_id | long | meta.id;meta.version | All Gaia data processed by the Data Processing and Analysis Consortium comes tagged with a solution identifier. This is a numeric field attached to each table row that can be used to unequivocally identify the version of all the subsystems that where used in the generation of the data as well as the input data used. It is mainly for internal DPAC use but is included in the published data releases to enable end users to examine the provenance of processed data products. To decode a given solution ID visit. | |||

source_id | long | meta.id;meta.main | A unique single numerical identifier of the source. For the contents of Gaia DR1, which does not include Solar System objects, the source ID consists consists of a 64-bit integer, least significant bit = 1 and most significant bit = 64, comprising: - a HEALPix index number (sky pixel) in bits 36 - 63; by definition the smallest HEALPix index number is zero. - a 2-bit Data Processing Centre code in bits 34 - 35; for example MOD(sourceId / 4294967296, 8) can be used to distinguish between sources initialised via the Initial Gaia Source List by the Torino DPC (code = 0) and sources otherwise detected and assigned by Gaia observations (code = >0) - a 25-bit plus 7 bit sequence number within the HEALPix pixel in bits 1 - 32 split into: - a 25 bit running number in bits 8-32;the running numbers are defined to be positive, i.e. ver zero (except in the case of forced empty windows) - a 7-bit component number in bits 1-7 - one spare bit in bit 33 This means that the HEALpix index level 12 of a given source is contained in the most significant bits. HEALpix index of 12 and lower levels can thus be retrieved as follows: - HEALpix level 12 = source_id / 34359738368 - HEALpix level 11 = source_id / 137438953472 - HEALpix level 10 = source_id / 549755813888 - HEALpix level n = source_id / 2 ^ 35 * 4 ^ (12 - level). | |||

random_index | long | meta.code | Random index which can be used to select smaller subsets of the data that are still representative. The column contains a random permutation of the numbers from 0 to N-1, where N is the number of rows. The random index can be useful for validation (testing on 10 different random subsets), visualization (displaying 1% of the data), and statistical exploration of the data, without the need to download all the data. | |||

ref_epoch | double | Time[Julian Years] | meta.ref;time.epoch | Reference epoch to which the astrometic source parameters are refer red, expressed as a Julian Year in TCB. | ||

ra | double | deg | pos.eq.ra;meta.main | Barycentric right ascension \alpha of the source in ICRS at the reference epoch refEpoch | ||

ra_error | double | Angle[mas] | stat.error;pos.eq.ra | Standard error \sigma_{\alpha *} \equiv \sigma_\alpha\cos\delta of the right ascension of the source in ICRS at the reference epoch refEpoch | ||

dec | double | deg | pos.eq.dec;meta.main | Barycentric declination \delta of the source in ICRS at the reference epoch refEpoch | ||

dec_error | double | Angle[mas] | stat.error;pos.eq.dec | Standard error \sigma_\delta of the declination of the source in ICRS at the reference epoch refEpoch | ||

parallax | double | Angle[mas] | pos.parallax | Absolute barycentric stellar parallax \varpi of the soure at the reference epoch refEpoch | ||

parallax_error | double | Angle[mas] | stat.error;pos.parallax | Standard error \sigma_\varpi of the stellar parallax at the referen ceepoch refEpoch | ||

pmra | double | Angular Velocity[mas/year] | pos.pm;pos.eq.ra | Proper motion in right ascension \mu_{\alpha *} of the source in IC RS at the reference epoch refEpoch. This is the projection of the proper motion vector in the direction of increasing right ascension. | ||

pmra_error | double | Angular Velocity[mas/year] | stat.error;pos.pm;pos.eq.ra | Standard error \sigma_{\mu\alpha *} of the proper motion vector in right ascension at the reference epoch refEpoch | ||

pmdec | double | Angular Velocity[mas/year] | pos.pm;pos.eq.dec | Proper motion in declination \mu_\delta of the source at the reference epoch refEpoch. This is the projection of the proper motion vector in the direction of increasing declination. | ||

pmdec_error | double | Angular Velocity[mas/year] | stat.error;pos.pm;pos.eq.dec | Standard error \sigma_{\mu\delta} of the proper motion in declination at the reference epoch refEpoch | ||

ra_dec_corr | float | Dimensionless | stat.correlation | Correlation between right ascension and declination, in dimensionless units [-1:+1] | ||

ra_parallax_corr | float | Dimensionless | stat.correlation | Correlation between right ascension and parallax, in dimensionless units [-1:+1] | ||

ra_pmra_corr | float | Dimensionless | stat.correlation | Correlation between right ascension and proper motion in right ascension, in dimensionless units [-1:+1] | ||

ra_pmdec_corr | float | Dimensionless | stat.correlation | Correlation between right ascension and proper motion in declination, in dimensionless units [-1:+1] | ||

dec_parallax_corr | float | Dimensionless | stat.correlation | Correlation between declination and parallax, in dimensionless units [-1:+1] | ||

dec_pmra_corr | float | Dimensionless | stat.correlation | Correlation between declination and proper motion in right ascension, in dimensionless units [-1:+1] | ||

dec_pmdec_corr | float | Dimensionless | stat.correlation | Correlation between declination and proper motion in declination, in dimensionless units [-1:+1] | ||

parallax_pmra_corr | float | Dimensionless | stat.correlation | Correlation between parallax and proper motion in right ascension, dimensionless units [-1:+1] | ||

parallax_pmdec_corr | float | Dimensionless | stat.correlation | Correlation between parallax and proper motion in declination, in dimensionless units [-1:+1] | ||

pmra_pmdec_corr | float | Dimensionless | stat.correlation | Correlation between proper motion in right ascension and proper motion in declination, in dimensionless units [-1:+1] | ||

astrometric_n_obs_al | int | Dimensionless | meta.number | Total number of AL observations (= CCD transits) used in the astrometric solution of the source, independent of their weight. Note that some observations may be strongly downweighted (see astrometricNBadObsAl). | ||

astrometric_n_obs_ac | int | Dimensionless | meta.number | Total number of AC observations (= CCD transits) used in the astrometric solution of the source, independent of their weight. Note that some observations may be strongly downweighted (see astrometricNBadObsAc). Nearly all sources having G less than 13 will have AC observations from 2d windows, while fainter than that limit only \sim1% of stars are assigned 2d windows resulting in AC observations. | ||

astrometric_n_good_obs_ac | int | Dimensionless | meta.number | Number of AC observations (= CCD transits) that were not strongly downweighted in the astrometric solution of the source. Strongly downweighted observations (with downweighting factor w less than 0.2) are instead counted in astrometricNBadObsAc. The sum of astrometricNGoodObsAc and astrometricNBadObsAc equals astrometricNObsAc, the total number of AC observations used in the astrometric solution of the source. | ||

astrometric_n_bad_obs_al | int | Dimensionless | meta.number | Number of AL observations (= CCD transits) that were strongly downweighted in the astrometric solution of the source, and therefore contributed little to the determination of the astrometric parameters. An observation is considered to be strongly downweighted if its downweighting factor w less than 0.2, which means that the absolute value of the astrometric residual exceeds 4.83 times the total uncertainty of the observation, calculated as the quadratic sum of the centroiding uncertainty, excess source noise, and excess attitude noise. | ||

astrometric_n_bad_obs_ac | int | Dimensionless | meta.number | Number of AC observations (= CCD transits) that were strongly downweighted in the astrometric solution of the source, and therefore contributed little to the determination of the astrometric parameters. An observation is considered to be strongly downweighted if its downweighting factor w less than 0.2, which means that the absolute value of the astrometric residual exceeds 4.83 times the total uncertainty of the observation, calculated as the quadratic sum of the centroiding uncertainty, excess source noise, and excess attitude noise. | ||

astrometric_delta_q | float | Angle[mas] | stat.value | In the TGAS solution \tt astrometricDeltaQ (\Delta Q) indicates the discrepancy between the Hipparcos proper motion and the TGAS proper motion. A large value of \tt deltaQ could indicate non-linear motion (e.g. n a binary). The precise definition is \Delta Q = \begin{bmatrix} \Delta\mu_{\alpha *} \and \Delta\mu_{\delta} \end{bmatrix} \left(\vec{C}_\text{pm,\,T}+\vec{C}_\text{pm,\,H}\right)^{-1} \begin{bmatrix} \Delta\mu_{\alpha *} \\ \Delta\mu_{\delta} \end{bmatrix} where \Delta\mu_{\alpha *} = \mu_{\alpha *,\rm T}-\mu_{\alpha *,\rm H}, \Delta\mu_{\delta} = \mu_{\delta,\rm T}-\mu_{\delta,\rm H}, with T and H indicating values from the Gaia DR1 (TGAS) solution and Hipparcos catalogue. \vec{C}_\text{pm,\,T} and \vec{C}_\text{pm,\,H} are the corresponding 2\times 2 covariance matrices. In order to compute \Delta Q the two sets of proper motions must use the same reference frame and the same reference epoch. Thus, the proper motion components as given in the Hipparcos catalogue were rotated to the Gaia DR1 reference frame, and then propagated to the Gaia reference epoch. | ||

astrometric_excess_noise | double | Angle[mas] | stat.value | This is the excess noise \epsilon_i of the source. It measures the disagreement, expressed as an angle, between the observations of a source and the best-fitting standard astrometric model (using five astrometric parameters). The assumed observational noise in each observation is quadratically increased by \epsilon_i in order to statistically match the residuals in the astrometric solution. A value of 0 signifies that the source is astrometrically well-behaved, i.e. that the residuals of the fit statistically agree with the assumed observational noise. A positive value signifies that the residuals are statistically larger than expected. The significance of \epsilon_i is given by \tt astrometricExcessNoiseSig (D). If D\le 2 then \epsilon_i is probably not significant, and the source may be astrometrically well-behaved even if \epsilon_i is large. The excess noise \epsilon_i may absorb all kinds of modelling errors that are not accounted for by the observational noise (image centroiding error) or the excess attitude noise. Such modelling errors include LSF and PSF calibration errors, geometric instrument calibration errors, and part of the high-frequency attitude noise. These modelling errors are particularly important in the early data releases, but should decrease as the astrometric modelling of the instrument and attitude improves over the years. Additionally, sources that deviate from the standard five-parameter astrometric model (e.g. n resolved binaries, exoplanet systems, etc.) may have positive \epsilon_i. Given the many other possible contributions to the excess noise, the user must study the empirical distributions of \epsilon_i and D to make sensible cutoffs before filtering out sources for their particular application. In Gaia DR1, the excess source noise has the same interpretation as described above for both the primary (TGAS) and secondary data sets. It measures the disagreement between the five-parameter model and the observations, augmented by the different priors used. Thus, in TGAS the excess noise may be increased if the proper motion seen during the 14 months of Gaia observations are not in agreement with the proper motion inferred from the Tycho-2/Gaia comparison. In the secondary solution the excess noise may be increased if the Gaia observations indicate a proper motion or parallax several times larger than the prior uncertainty. The excess source noise is further explained in Sects .6 and 5.1.2 of Lindegren et al. (2012). Lindegren, L., U. Lammers, D. Hobbs, MullaneW., U. Bastian, and J. Hernandez. 2012.The Astrometric Core Solution for the Gaia Mission. Overview of Models, Algorithms, and Software Implementation. Astronomy and Astrophysics 538 (February). | ||

astrometric_excess_noise_sig | double | Angle[mas] | stat.value | A dimensionless measure (D) of the significance of the calculated \ tt astrometricExcessNoise (\epsilon_i). A value D less than 2 indicates that the given \epsilon_i is probably significant. For good fits in the limit of a large number of observations, D should be zero in half of the cases and approximately follow the positive half of a normal distribution with zero mean and unit standard deviation for the other half. Consequently, D is expected to be greater than 2 for only a few percent of the sources with well-behaved astrometric solutions. In the early data releases \epsilon_i will however include instrument and attitude modelling errors that are statistically significant and could result in large values of \epsilon_i and D. The user must study the empirical distributions of these statistics and make sensible cutoffs before filtering out sources for their particular application. The excess noise significance is further explained in Sect. 1.2 of Lindegren et al. (2012). Lindegren, L., U. Lammers, D. Hobbs, MullaneW., U. Bastian, and J. Hernandez. 2012.The Astrometric Core Solution for the Gaia Mission. Overview of Models, Algorithms, and Software Implementation. Astronomy and Astrophysics 538 (February). | ||

astrometric_primary_flag | boolean | meta.code | Flag indicating if this source was used as a primary source (\tt true) or secondary source (\tt false). Only primary sources contribute to the estimation of attitude, calibration, and global parameters. The estimation of source parameters is otherwise done in exactly the same way for primary and secondary sources. | |||

astrometric_relegation_factor | float | arith.factor | Relegation factor of the source calculated as per Eq. 118) in Lindegren et al. (2012) used for the primary selection process. Lindegren, L., U. Lammers, D. Hobbs, MullaneW., U. Bastian, and J. Hernandez. 2012.The Astrometric Core Solution for the Gaia Mission. Overview of Models, Algorithms, and Software Implementation. Astronomy and Astrophysics 538 (February). | |||

astrometric_weight_al | float | Angle[mas^-2] | stat.weight;stat.mean | Mean astrometric weight of the source in the AL direction The mean astrometric weight of the source is calculated as per Eq. \sigma =(119) in Lindegren et al. (2012). Lindegren, L., U. Lammers, D. Hobbs, MullaneW., U. Bastian, and J. Hernandez. 2012.The Astrometric Core Solution for the Gaia Mission. Overview of Models, Algorithms, and Software Implementation. Astronomy and Astrophysics 538 (February). | ||

astrometric_priors_used | int | meta.number | Type of prior used in the astrometric solution: - 0: No prior used - 1: Galaxy Bayesian Prior for parallax and proper motion - 2: Galaxy Bayesian Prior for parallax and proper motion relaxed by factor 10 - 3: Hipparcos prior for position - 4: Hipparcos prior for position and proper motion - 5: Tycho2 prior for position - 6: Quasar prior for proper motion The Galaxy Bayesian Prior is defined in , where it is denoted \sigma_{\varpi,F90} (for the parallax) and \sigma_{\mu,F90}={\cal R}\sigma_{\varpi,F90}, with {\cal R}=10r^{-1} (for proper motion). The Galaxy Bayesian Prior relaxed by a factor 10 is 10\sigma_{\varpi,F90} and 10\sigma_{\mu,F90}, respectively. For Gaia DR1 the only types of priors used are 2 (for the secondary data set), 3 (for the Hipparcos subset of the primary data set), or 5 (for the non-Hipparcos subset of the primary data set). Type 6 was used for internal calibration purposes and alignment of the reference frame, but the corresponding astrometric results are in general not published. | |||

matched_observations | short | meta.number | This field indicates the number of observations (detection transits) that have been matched to a given source during the last internal crossmatch revision. | |||

duplicated_source | boolean | meta.number | During data processing, this source happened to been duplicated and one source only has been kept. This may indicate observational, cross-matching or processing problems, or stellar multiplicity, and probable astrometric or photometric problems in all cases. In DR1, for close doubles with separations below some 2 arcsec, truncated windows have not been processed, neither in astrometry and photometry. The transmitted window is centred on the brighter part of the acquired window, so the brighter component has a better chance to be selected, even when processing the fainter transit. If more than two images are contained in a window, the result of the image parameter determination is un-predictable in the sense that it might refer to either (or neither) image, and no consistency is assured. | |||

scan_direction_strength_k1 | float | meta.number | The scanDirectionStrength and scanDirectionMean quantify the distribution of AL scan directions across the source. scanDirectionStrength[k-1] (k=1,2,3,4) is the absolute value of the trigonometric moments m_k=\langle\exp(ik\theta)\rangle, where \theta is the position angle of the scan and the mean value is taken over the nObs[0] AL observations contributing to the astrometric parameters of the source. \theta is defined in the usual astronomical sense: \theta=0 when the FoV is moving towards local North, and \theta=90^\circ towards local East. The scanDirectionStrength is a number between 0 and 1, where 0 means that the scan directions are well spread out in different directions, while 1 means that they are concentrated in a single direction (given by scanAngleMean). The different orders k are statistics of the scan directions modulo 360^\circ/k. For example, at first order (k=1), \theta=10^\circ and \theta=190^\circ count as different directions, but at second order (k=2) they are the same. Thus, scanDirectionStrength[0] is the degree of concentration when the sense of direction is taken into account, while scanDirectionStrength[1] is the degree of concentration without regard to the sense of direction. A large value of scanDirectionStrength[3] indicates that the scans are concentrated in two nearly orthogonal directions. | |||

scan_direction_strength_k2 | float | meta.number | The scanDirectionStrength and scanDirectionMean quantify the distribution of AL scan directions across the source. scanDirectionStrength[k-1] (k=1,2,3,4) is the absolute value of the trigonometric moments m_k=\langle\exp(ik\theta)\rangle, where \theta is the position angle of the scan and the mean value is taken over the nObs[0] AL observations contributing to the astrometric parameters of the source. \theta is defined in the usual astronomical sense: \theta=0 when the FoV is moving towards local North, and \theta=90^\circ towards local East. The scanDirectionStrength is a number between 0 and 1, where 0 means that the scan directions are well spread out in different directions, while 1 means that they are concentrated in a single direction (given by scanAngleMean). The different orders k are statistics of the scan directions modulo 360^\circ/k. For example, at first order (k=1), \theta=10^\circ and \theta=190^\circ count as different directions, but at second order (k=2) they are the same. Thus, scanDirectionStrength[0] is the degree of concentration when the sense of direction is taken into account, while scanDirectionStrength[1] is the degree of concentration without regard to the sense of direction. A large value of scanDirectionStrength[3] indicates that the scans are concentrated in two nearly orthogonal directions. | |||

scan_direction_strength_k3 | float | meta.number | The scanDirectionStrength and scanDirectionMean quantify the distribution of AL scan directions across the source. scanDirectionStrength[k-1] (k=1,2,3,4) is the absolute value of the trigonometric moments m_k=\langle\exp(ik\theta)\rangle, where \theta is the position angle of the scan and the mean value is taken over the nObs[0] AL observations contributing to the astrometric parameters of the source. \theta is defined in the usual astronomical sense: \theta=0 when the FoV is moving towards local North, and \theta=90^\circ towards local East. The scanDirectionStrength is a number between 0 and 1, where 0 means that the scan directions are well spread out in different directions, while 1 means that they are concentrated in a single direction (given by scanAngleMean). The different orders k are statistics of the scan directions modulo 360^\circ/k. For example, at first order (k=1), \theta=10^\circ and \theta=190^\circ count as different directions, but at second order (k=2) they are the same. Thus, scanDirectionStrength[0] is the degree of concentration when the sense of direction is taken into account, while scanDirectionStrength[1] is the degree of concentration without regard to the sense of direction. A large value of scanDirectionStrength[3] indicates that the scans are concentrated in two nearly orthogonal directions. | |||

scan_direction_strength_k4 | float | meta.number | ||||

scan_direction_mean_k1 | float | Angle[deg] | meta.number | |||

scan_direction_mean_k2 | float | Angle[deg] | meta.number | |||

scan_direction_mean_k3 | float | Angle[deg] | meta.number | |||

scan_direction_mean_k4 | float | Angle[deg] | meta.number | |||

phot_g_n_obs | int | meta.number | Number of observations (CCD transits) that contributed to the G mean flux and mean flux error. | |||

phot_g_mean_flux | double | Flux[e-/s] | phot.flux;stat.mean;em.opt | Mean flux in the G-band. | ||

phot_g_mean_flux_error | double | Flux[e-/s] | stat.error;phot.flux;stat.mean;em.opt | Error on the mean flux in the G-band. | ||

phot_g_mean_mag | double | Magnitude[mag] | phot.mag;stat.mean;em.opt | Mean magnitude in the G band. This is computed from the G-band mean flux applying the magnitude zero-point in the Vega scale. | ||

phot_variable_flag | string | char | meta.code;src.var | Flag indicating if variability was identified in the photometric G band: - source not processed and/or exported to catalogue - Source not identified as variable - source identified and processed as variable, see tables PhotVariableSummary, PhotVariableTimeSeriesGfov, PhotVariableTimeSeriesGfovStatisticalParameters, and Cepheid or Rrlyrae for more details. Note that for this data release only a small subset of (variable) sources was processed and/or exported, so for many (known) variable sources this flag is set to NOT AVAILABLE. No CONSTANT sources were exported either. | ||

l | double | Angle[deg] | pos.galactic.lon | Galactic Longitude of the object at reference epoch refEpoch, see ESA, 1997, The Hipparcos and Tycho Catalogues ESA SP-1200, Volume 1, Section 1.5.3, for the conversion details. | ||

b | double | Angle[deg] | pos.galactic.lat | Galactic Latitude of the object at reference epoch refEpoch 1997, The Hipparcos and Tycho Catalogues ESA SP-1200, Volume 1, Section 1.5.3, for the conversion details. | ||

ecl_lon | double | Angle[deg] | pos.ecliptic.lon | Ecliptic Longitude of the object at reference epoch refEpoch, see ESA 1997, The Hipparcos and Tycho Catalogues ESA SP-1200, Volume 1, Section 1.5.3, for the conversion details. | ||

ecl_lat | double | Angle[deg] | pos.ecliptic.lon | Ecliptic Latitude of the object at reference epoch refEpoch, see ESA 1997, The Hipparcos and Tycho Catalogues ESA SP-1200, Volume 1, Section 1.5.3, for the conversion details. |