Table information for 'gaia.dr2light'

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General

This table is available for ADQL queries and through the TAP endpoint.

Resource Description: This is a “light” version of the full Gaia DR2 gaia_source table, containing the original astrometric and photmetric columns with just enough additional information to let careful researchers notice when data is becomes uncertain and the full error model should be consulted. The full DR2 is available from numerous places in the VO (in particular from the TAP services ivo://uni-heidelberg.de/gaia/tap and ivo://esavo/gaia/tap.

For a list of all services and tables belonging to this table's resource, see Information on resource 'Gaia Data Release 2 (DR2) gaia_source light'

Citing this table

Reference the Table

To cite the table as such, we suggest the following BibTeX entry:

@MISC{vo:gaia_dr2light,
  year=2018,
  title={Gaia Data Release 2 (DR2) gaia\_source light},
  author={{GAIA} Collaboration},
  url={http://dc.zah.uni-heidelberg.de/tableinfo/gaia.dr2light},
  howpublished={{VO} resource provided by the {GAVO} Data Center}
}

Fields

Sorted by DB column index. [Sort alphabetically]

NameTable Head DescriptionUnitUCD
source_id Source Id Unique source identifier. Note that this *cannot* be matched against the DR1 source_id. [Note id] N/A meta.id;meta.main
ra RA (ICRS) Barycentric Right Ascension in ICRS at ref_epoch deg pos.eq.ra;meta.main
dec Dec (ICRS) Barycentric Declination in ICRS at ref_epoch deg pos.eq.dec;meta.main
ra_error Err. RA Standard error of ra (with cos δ applied). mas stat.error;pos.eq.ra
dec_error Err. Dec Standard error of dec mas stat.error;pos.eq.dec
pmra µ(RA) Proper 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/yr pos.pm;pos.eq.ra
pmdec µ(Dec) Proper motion in declination at ref_epoch. mas/yr pos.pm;pos.eq.dec
pmra_error Err. PM(RA) Standard error of pmra mas/yr stat.error;pos.pm;pos.eq.ra
pmdec_error Err. PM(Dec) Standard error of pmdec mas/yr stat.error;pos.pm;pos.eq.dec
parallax Parallax Absolute barycentric stellar parallax of the source at the reference epoch ref_epoch mas pos.parallax
parallax_error Parallax_error Standard error of parallax mas stat.error;pos.parallax
phot_g_mean_mag m_G Mean magnitude in the G band. This is computed from the G-band mean flux applying the magnitude zero-point in the Vega scale. mag phot.mag;em.opt;stat.mean
phot_g_mean_flux Flux_G G-band mean flux as electrons per second. s**-1 phot.flux;em.opt;stat.mean
phot_g_mean_flux_error Err. Flux(G) Error on phot_g_mean_flux s**-1 stat.error;phot.flux;em.opt;stat.mean
phot_rp_mean_flux Flux RP Mean flux in the integrated RP band. s**-1 phot.flux;em.opt.R
phot_rp_mean_flux_error Err. Fl. RP Error in the mean flux in the integrated RP band. Errors are computed from the dispersion about the weighted mean of the input calibrated photometry. s**-1 stat.error;phot.flux;em.opt.R
phot_rp_mean_mag Mag RP Mean magnitude in the integrated RP band. This is computed from the RP-band mean flux applying the magnitude zero-point in the Vega scale. No error is provided for this quantity as the error distribution is only symmetric in flux space. For errors small compared to the flux (less than 10%, say), the magnitude error is well approximated by 1.09*flux/flux_err. mag phot.mag;em.opt.R
phot_bp_mean_flux Flux BP Mean flux in the integrated BP band. s**-1 phot.flux;em.opt.B
phot_bp_mean_flux_error Err. Fl. BP Error in the mean flux in the integrated BP band. Errors are computed from the dispersion about the weighted mean of the input calibrated photometry. s**-1 stat.error;phot.flux;em.opt.B
phot_bp_mean_mag Mag BP Mean magnitude in the integrated BP band. This is computed from the BP-band mean flux applying the magnitude zero-point in the Vega scale. No error is provided for this quantity as the error distribution is only symmetric in flux space. For errors small compared to the flux (less than 10%, say), the magnitude error is well approximated by 1.09*flux/flux_err. mag phot.mag;em.opt.B
phot_rp_bp_excess_factor RP/BP excess BP/RP excess factor estimated from the comparison of the sum of integrated BP and RP fluxes with respect to the flux in the G band. This measures the excess of flux in the BP and RP integrated photometry with respect to the G band. This excess is believed to be caused by background and contamination issues affecting the BP and RP data. Therefore a large value of this factor for a given source indicates systematic errors in the BP and RP photometry. N/A stat.fit.goodness
radial_velocity RV Spectroscopic radial velocity in the solar barycentric reference frame. The radial velocity provided is the median value of the radial velocity measurements at all epochs. km/s spect.dopplerVeloc
radial_velocity_error Err. RV The radial velocity error is the error on the median to which a constant noise floor of 0.11 km/s has been added in quadrature to take into account the calibration contribution. km/s stat.error;spect.dopplerVeloc
astrometric_gof_al GoF Goodness-of-fit statistic of the astrometric solution for the source in the along-scan direction. [Note gof] N/A stat.fit.goodness
astrometric_params_solved PS This is a binary code indicating which astrometric parameters were estimated for the source. A set bit means the parameter was estimated. The least-significant bit represents α, the next bits δ, parallax, PM(RA) and PM(De). For Gaia DR2 the only relevant values are 31 (all five parameters solved) and 3 (only positions). N/A meta.code
random_index Random Random index that can be used to deterministically select subsets N/A meta.code

Columns that are parts of indices are marked like this.

Other

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Notes

Copyright and such:

If you use public Gaia DR2 data in a paper, please take note of ESAC's guide on how to acknowledge and cite it.