Gaia Data Release 1 (DR1) gaia_sourcegaia.dr1ivo://org.gavo.dc/gaia/q/dr1The GAVO DC teamGaia Collaboration2020-11-18T10:10:30ZGAVO Data Center TeamMönchhofstrasse 12-14, D-69120 Heidelberggavo@ari.uni-heidelberg.de++49 6221 54 1837starssurveysastrometryproper-motions This table, corresponding to gaia_source of the full DR1, contains
the 1.15 billion objects reliably detected in the first 14 months of
Gaia observations. It essentially consists of high-precision positions
and magnitudes. The TGAS subset (about 2 million objects observed by
both Gaia and Hipparcos) has proper motions and parallaxes. Users are
advised to beware strong correlations between the astrometric
parameters present for some of the less densely observed objects and
the inhomogeneous coverage in this first data release (solution id:
1635378410781933568).http://dc.zah.uni-heidelberg.de/tableinfo/gaia.dr10/0-1157023 570231.986e-19 4.966e-19OpticalgaiaGaia Data Release 1 (DR1) This schema contains data re-published from the official Gaia mirrors
(such as ivo://uni-heidelberg.de/gaia/tap) either to support combining
its data with local tables (the various Xlite tables) or to make the
data more accessible to VO clients (e.g., epoch fluxes).
Other Gaia-related data is found in, among others, the gdr2dist,
gdr3mock, gdr3spec, gedr3auto, gedr3dist, gedr3mock, and gedr3spur
schemas.
gaia.dr1Gaia Data Release 1 (DR1) gaia_source This table, corresponding to gaia_source of the full DR1, contains
the 1.15 billion objects reliably detected in the first 14 months of
Gaia observations. It essentially consists of high-precision positions
and magnitudes. The TGAS subset (about 2 million objects observed by
both Gaia and Hipparcos) has proper motions and parallaxes. Users are
advised to beware strong correlations between the astrometric
parameters present for some of the less densely observed objects and
the inhomogeneous coverage in this first data release (solution id:
1635378410781933568).source_idUnique source identifiermeta.id;meta.mainlongindexedprimaryraBarycentric Right Ascension in ICRS at ref_epochdegpos.eq.ra;meta.maindoubleindexednullabledecBarycentric Declination in ICRS at ref_epochdegpos.eq.dec;meta.maindoubleindexednullablera_errorStandard error of ra (with cos δ applied).masstat.error;pos.eq.rafloatnullabledec_errorStandard error of decmasstat.error;pos.eq.decfloatnullablelGalactic longitude (converted from ra, dec)degpos.galactic.londoublenullablebGalactic latitude (converted from ra, dec)degpos.galactic.latdoublenullablepmraProper motion in right ascension of the source in ICRS at ref_epoch. This is the projection of the proper motion vector in the direction of increasing right ascension.mas/yrpos.pm;pos.eq.rafloatnullablepmdecProper motion in declination at ref_epoch.mas/yrpos.pm;pos.eq.decfloatnullablepmra_errorStandard error of pmramas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmdec_errorStandard error of pmdecmas/yrstat.error;pos.pm;pos.eq.decfloatnullableparallaxAbsolute barycentric stellar parallax of the source at the reference epoch ref_epochmaspos.parallaxfloatnullableparallax_errorStandard error of parallaxmasstat.error;pos.parallaxfloatnullablephot_g_mean_magMean magnitude in the G band. This is computed from the G-band mean flux applying the magnitude zero-point in the Vega scale.magphot.mag;em.opt;stat.meanfloatnullablephot_g_mean_fluxG-band mean flux as electrons per second.s**-1phot.flux;em.opt;stat.meandoublenullablephot_g_mean_flux_errorError on phot_g_mean_fluxs**-1stat.error;phot.flux;em.opt;stat.meanfloatnullablephot_g_n_obsNumber of observations contributing to G photometrymeta.numbershortnullablephot_variable_flagPhotometric variability flagmeta.code;src.varcharnullableref_epochReference epoch to which the astrometic source parameters are referred, expressed as a Julian Year in TCB.yrmeta.ref;time.epochdoublenullableastrometric_delta_qHipparcos/Gaia data discrepancy (Hipparcos subset of TGAS only)stat.valuefloatnullableastrometric_excess_noiseExcess noise of the sourcemasstat.valuefloatnullableastrometric_excess_noise_sigSignificance of excess noisestat.valuefloatnullableastrometric_n_obs_acTotal number of observations ACmeta.numbershortastrometric_n_obs_alTotal number of observations ALmeta.numbershortastrometric_n_bad_obs_acNumber of bad observations ACmeta.numbershortastrometric_n_bad_obs_alNumber of bad observations ALmeta.numbershortastrometric_n_good_obs_acNumber of good observations ACmeta.numbershortastrometric_n_good_obs_alNumber of good observations ALmeta.numbershortastrometric_primary_flagOnly primary sources (for which this flag is True) contribute to the estimation of attitude, calibration, and global parameters. The estimation of source parameters is not affected by primariness.meta.codeshortmatched_observationsThe number of observations (detection transits) that have been matched to a given source during the last internal crossmatch revision.meta.numbershortastrometric_priors_usedType of prior used in in the astrometric solutionshortnullableastrometric_relegation_factorRelegation factor of the source calculated as per Eq. (118) in 2012A&A...538A..78L used for the primary selection process.arith.factorfloatnullableastrometric_weight_acMean astrometric weight of the sourcemas**-2stat.weight;stat.meanfloatnullableastrometric_weight_alMean astrometric weight of the sourcemas**-2stat.weight;stat.meanfloatnullableduplicated_sourceDuring data processing, this source happened to been duplicated and one source only has been kept.shortra_dec_corrCorrelation between right ascension and declinationstat.correlationfloatnullablera_pmra_corrCorrelation between right ascension and proper motion in right ascensionstat.correlationfloatnullablera_pmdec_corrCorrelation between right ascension and proper motion in declinationstat.correlationfloatnullabledec_pmra_corrCorrelation between declination and proper motion in right ascensionstat.correlationfloatnullabledec_pmdec_corrCorrelation between declination and proper motion in declinationstat.correlationfloatnullablepmra_pmdec_corrCorrelation between proper motion in right ascension and proper motion in declinationstat.correlationfloatnullablera_parallax_corrCorrelation between right ascension and parallaxstat.correlationfloatnullabledec_parallax_corrCorrelation between declination and parallaxstat.correlationfloatnullableparallax_pmra_corrCorrelation between parallax and proper motion in right ascensionstat.correlationfloatnullableparallax_pmdec_corrCorrelation between parallax and proper motion in declinationstat.correlationfloatnullablescan_direction_mean_k1Mean position angle of scan directions across the sourcedegfloatnullablescan_direction_strength_k1Degree of concentration of scan directions across the sourcefloatnullablescan_direction_mean_k2Mean position angle of scan directions across the sourcedegfloatnullablescan_direction_strength_k2Degree of concentration of scan directions across the sourcefloatnullablescan_direction_mean_k3Mean position angle of scan directions across the sourcedegfloatnullablescan_direction_strength_k3Degree of concentration of scan directions across the sourcefloatnullablescan_direction_mean_k4Mean position angle of scan directions across the sourcedegfloatnullablescan_direction_strength_k4Degree of concentration of scan directions across the sourcefloatnullablerandom_indexRandom index that can be used to deterministically select subsetsmeta.codelong