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Fields Dictionary

Field	Variable	Type	Units	Description
source_id	source_id	long		Unique source identifier
random_index	random_index	long		Random index used to select subsets
ref_epoch	ref_epoch	double	year	Reference epoch (J2015.5) in Julian years
pos		float		Barycentric position
ra	ra	double	deg	Barycentric right ascension of the source
ra_error	ra_error	double	mas	Standard error of right ascension
dec	dec	double	deg	Barycentric declination of the source
dec_error	dec_error	double	mas	Standard error of declination
parallax	parallax	double	mas	Absolute parallax of the source
parallax_error	parallax_error	double	mas	Standard error of parallax
parallax_over_error	parallax_over_error	float		Parallax divided by its standard error
pm		double	mas/year	Proper motion
pmra	pmra	double	mas/year	Proper motion in right ascension (pmra) direction
ra_error	pmra_error	double	mas/year	Standard error of proper motion in right ascension direction
pmdec	pmdec	double	mas/year	Proper motion in declination direction
pmdec_error	pmdec_error	double	mas/year	Standard error of proper motion in declination direction
corr		float		Correlation
ra_dec	ra_dec_corr	float		Correlation between right ascension and declination
ra_parallax	ra_parallax_corr	float		Correlation between right ascension and parallax
ra_pmra	ra_pmra_corr	float		Correlation between right ascension and pmra
ra_pmdec	ra_pmdec_corr	float		Correlation between right ascension and proper motion in declination
dec_parallax	dec_parallax_corr	float		Correlation between declination and parallax
dec_pmra	dec_pmra_corr	float		Correlation between declination and pmra
dec_pmdec	dec_pmdec_corr	float		Correlation between declination and proper motion in declination
parallax_pmra	parallax_pmra_corr	float		Correlation between parallax and pmra
parallax_pmdec	parallax_pmdec_corr	float		Correlation between parallax and proper motion in declination
pmra_pmdec	pmra_pmdec_corr	float		Correlation between pmra and proper motion in declination
astrometry		float
n_obs_al	astrometric_n_obs_al	integer		Total number of AL observations (=CCD transits), independent of their weight
n_obs_ac	astrometric_n_obs_ac	integer		Total number of AC observations (=CCD transits), independent of their weight
n_good_obs_al	astrometric_n_good_obs_al	integer		Number of good AL observations (not strongly downweighted)
n_bad_obs_al	astrometric_n_bad_obs_al	integer		Number of bad AL observations (strongly downweighted)
gof_al	astrometric_gof_al	float		Goodness of fit statistic of model wrt along-scan observations
chi2_al	astrometric_chi2_al	float		${\chi}^2$ value in the AL direction
excess_noise	astrometric_excess_noise	double	mas	Excess noise of the source
excess_noise_sig	astrometric_excess_noise_sig	double		Significance of excess noise
params_solved	astrometric_params_solved	byte		Binary code indicating which parameters were estimated for the source
primary_flag	astrometric_primary_flag	boolean		Indicator if this source was used as a primary (true) or secondary (false)
weight_al	astrometric_weight_al	float	$mas^{-2}$	Mean astrometric weight of the source in the AL direction
pseudo_colour	astrometric_pseudo_colour	double	$\mu{m}^{-1}$	Astrometrically determined pseudocolour of the source
pseudo_colour_error	astrometric_pseudo_colour_error	double	$\mu{m}^{-1}$	Standard error of the pseudocolour of the source
mean_varpi_factor_al	mean_varpi_factor_al	float		Mean Parallax factor in the AL direction
matched_observations	astrometric_matched_observations	short		Matched FOV transits used in the AGIS solution
visibility_periods_used	visibility_periods_used	short		Number of visibility periods used in astrometric solution
sigma5d_max	astrometric_sigma5d_max	float	mas	The longest semi-major axis of the 5-d error ellipsoid
frame_rotator_object_type	frame_rotator_object_type	integer		The type of the source mainly used for frame rotation
matched_observations	matched_observations	short		Amount of observations matched to this source
duplicated_source	duplicated_source	boolean		Source with duplicate sources
phot_g		float		G-band photometry
n_obs	phot_g_n_obs	integer		Number of observations contributing to G photometry
mean_flux	phot_g_mean_flux	double	${e^-}/s$	G-band mean flux
mean_flux_error	phot_g_mean_flux_error	double	${e^-}/s$	Error on G-band mean flux
mean_flux_over_error	phot_g_mean_flux_over_error	float		G-band mean flux divided by its error
mean_mag	phot_g_mean_mag	float	mag	G-band mean magnitude
phot_bp		float		BP photometry
n_obj	phot_bp_n_obs	integer		Number of observations contributing to BP photometry
mean_flux	phot_bp_mean_flux	double	${e^-}/s$	Integrated BP mean flux
mean_flux_error	phot_bp_mean_flux_error	double	${e^-}/s$	Error on the integrated BP mean flux
mean_flux_over_error	phot_bp_mean_flux_over_error	float		Integrated BP mean flux divided by its error
mean_mag	phot_bp_mean_mag	float	mag	Integrated BP mean magnitude
phot_rp		float		RP photometry
n_obs	phot_rp_n_obs	integer		Number of observations contributing to RP photometry
mean_flux	phot_rp_mean_flux	double	${e^-}/s$	Integrated RP mean flux
mean_flux_error	phot_rp_mean_flux_error	double	${e^-}/s$	Error on the integrated RP mean flux
mean_flux_over_error	phot_rp_mean_flux_over_error	float		Integrated RP mean flux divided by its error
mean_mag	phot_rp_mean_mag	float	mag	Integrated RP mean magnitude
phot_bp_rp_excess_factor	phot_bp_rp_excess_factor	float		BP/RP excess factor
phot_proc_mode	phot_proc_mode	byte		Photometry processing mode (0=gold, 1=silver, 2=bronze)
bp_rp	bp_rp	float	mag	BP - RP colour
bp_g	bp_g	float	mag	BP - G colour
g_rp	g_rp	float	mag	G - RP colour
radial_velocity	radial_velocity	double	km/s	Radial velocity
radial_velocity_error	radial_velocity_error	double	km/s	Radial velocity error
rv_nb_transits	rv_nb_transits	integer		Number of transits used to compute radial velocity
rv_template_teff	rv_template_teff	float	K	Teff of the template used to compute radial velocity
rv_template_logg	rv_template_logg	float	log cgs	logg of the template used to compute radial velocity
rv_template_fe_h	rv_template_fe_h	float	dex	Fe/H of the template used to compute radial velocity
phot_variable_flag	phot_variable_flag	byte		Photometric variability flag (-1=NOT_AVAILABLE)
l	l	double	deg	Galactic longitude
b	b	double	deg	Galactic latitude
ecl_lon	ecl_lon	double	deg	Ecliptic longitude
ecl_lat	ecl_lat	double	deg	Ecliptic latitude
priam_flags	priam_flags	long		flags for the Apsis-Priam results
teff		float	K	stellar effective temperature
val	teff_val	float	K	Stellar effective temperature
lower	teff_percentile_lower	float	K	lower uncertainty
upper	teff_percentile_upper	float	K	upper uncertainty
a_g		float	mag	line-of-sight extinction in the G band, A_G
val	a_g_val	float	mag	line-of-sight extinction in the G band, A_G
lower	a_g_percentile_lower	float	mag	lower uncertainty
upper	a_g_percentile_upper	float	mag	upper uncertainty
e_bp_min_rp		float	mag	line-of-sight reddening E(BP-RP)
val	e_bp_min_rp_val	float	mag	line-of-sight reddening E(BP-RP)
lower	e_bp_min_rp_percentile_lower	float	mag	lower uncertainty
upper	e_bp_min_rp_percentile_upper	float	mag	upper uncertainty
flame_flags	flame_flags	long		Flags for the Apsis-FLAME results
radius		float	$r_\odot$	stellar radius
val	radius_val	float	$r_\odot$
lower	radius_percentile_lower	float	$r_\odot$	lower uncertainty
upper	radius_percentile_upper	float	$r_\odot$	upper uncertainty
lum		float	$L_\odot$	stellar luminosity
val	lum_val	float	L_sun	Stellar luminosity
lower	lum_percentile_lower	float	$L_\odot$	lower uncertainty
upper	lum_percentile_upper	float	$L_\odot$	upper uncertainty

About Catalog

Gaia Data Release 2 source catalog from the European Space Agency, released Apr 25 2018.

More under:

milkyway/gaiadr2

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source_id Unique source identifier	pos Barycentric position				parallax mas Absolute parallax of the source	parallax_error mas Standard error of parallax	parallax_over_error Parallax divided by its standard error	pm mas/year Proper motion				corr Correlation										astrometry																	frame_rotator_object_type The type of the source mainly used for frame rotation	matched_observations Amount of observations matched to this source	duplicated_source Source with duplicate sources	phot_g G-band photometry					phot_bp BP photometry					phot_rp RP photometry					phot_bp_rp_excess_factor BP/RP excess factor	phot_proc_mode Photometry processing mode (0=gold, 1=silver, 2=bronze)	bp_rp mag BP - RP colour	bp_g mag BP - G colour	g_rp mag G - RP colour	radial_velocity km/s Radial velocity	radial_velocity_error km/s Radial velocity error	rv_nb_transits Number of transits used to compute radial velocity	rv_template_teff K Teff of the template used to compute radial velocity	rv_template_logg log cgs logg of the template used to compute radial velocity	rv_template_fe_h dex Fe/H of the template used to compute radial velocity	phot_variable_flag Photometric variability flag (-1=NOT_AVAILABLE)	l deg Galactic longitude	b deg Galactic latitude	ecl_lon deg Ecliptic longitude	ecl_lat deg Ecliptic latitude	priam_flags flags for the Apsis-Priam results	teff K stellar effective temperature			a_g mag line-of-sight extinction in the G band, A_G			e_bp_min_rp mag line-of-sight reddening E(BP-RP)			flame_flags Flags for the Apsis-FLAME results	radius $r_\odot$ stellar radius			lum $L_\odot$ stellar luminosity
source_id Unique source identifier	ra deg Barycentric right ascension of the source	ra_error mas Standard error of right ascension	dec deg Barycentric declination of the source	dec_error mas Standard error of declination	parallax mas Absolute parallax of the source	parallax_error mas Standard error of parallax	parallax_over_error Parallax divided by its standard error	pmra mas/year Proper motion in right ascension (pmra) direction	ra_error mas/year Standard error of proper motion in right ascension direction	pmdec mas/year Proper motion in declination direction	pmdec_error mas/year Standard error of proper motion in declination direction	ra_dec Correlation between right ascension and declination	ra_parallax Correlation between right ascension and parallax	ra_pmra Correlation between right ascension and pmra	ra_pmdec Correlation between right ascension and proper motion in declination	dec_parallax Correlation between declination and parallax	dec_pmra Correlation between declination and pmra	dec_pmdec Correlation between declination and proper motion in declination	parallax_pmra Correlation between parallax and pmra	parallax_pmdec Correlation between parallax and proper motion in declination	pmra_pmdec Correlation between pmra and proper motion in declination	n_obs_al Total number of AL observations (=CCD transits), independent of their weight	n_obs_ac Total number of AC observations (=CCD transits), independent of their weight	n_good_obs_al Number of good AL observations (not strongly downweighted)	n_bad_obs_al Number of bad AL observations (strongly downweighted)	gof_al Goodness of fit statistic of model wrt along-scan observations	chi2_al ${\chi}^2$ value in the AL direction	excess_noise mas Excess noise of the source	excess_noise_sig Significance of excess noise	params_solved Binary code indicating which parameters were estimated for the source	primary_flag Indicator if this source was used as a primary (true) or secondary (false)	weight_al $mas^{-2}$ Mean astrometric weight of the source in the AL direction	pseudo_colour $\mu{m}^{-1}$ Astrometrically determined pseudocolour of the source	pseudo_colour_error $\mu{m}^{-1}$ Standard error of the pseudocolour of the source	mean_varpi_factor_al Mean Parallax factor in the AL direction	matched_observations Matched FOV transits used in the AGIS solution	visibility_periods_used Number of visibility periods used in astrometric solution	sigma5d_max mas The longest semi-major axis of the 5-d error ellipsoid			duplicated_source Source with duplicate sources	n_obs Number of observations contributing to G photometry	mean_flux ${e^-}/s$ G-band mean flux	mean_flux_error ${e^-}/s$ Error on G-band mean flux	mean_flux_over_error G-band mean flux divided by its error	mean_mag mag G-band mean magnitude	n_obj Number of observations contributing to BP photometry	mean_flux ${e^-}/s$ Integrated BP mean flux	mean_flux_error ${e^-}/s$ Error on the integrated BP mean flux	mean_flux_over_error Integrated BP mean flux divided by its error	mean_mag mag Integrated BP mean magnitude	n_obs Number of observations contributing to RP photometry	mean_flux ${e^-}/s$ Integrated RP mean flux	mean_flux_error ${e^-}/s$ Error on the integrated RP mean flux	mean_flux_over_error Integrated RP mean flux divided by its error	mean_mag mag Integrated RP mean magnitude	phot_bp_rp_excess_factor BP/RP excess factor		bp_rp mag BP - RP colour	bp_g mag BP - G colour	g_rp mag G - RP colour	radial_velocity km/s Radial velocity	radial_velocity_error km/s Radial velocity error						l deg Galactic longitude	b deg Galactic latitude	ecl_lon deg Ecliptic longitude	ecl_lat deg Ecliptic latitude	priam_flags flags for the Apsis-Priam results	val K Stellar effective temperature	lower K lower uncertainty	upper K upper uncertainty	val mag line-of-sight extinction in the G band, A_G	lower mag lower uncertainty	upper mag upper uncertainty	val mag line-of-sight reddening E(BP-RP)	lower mag lower uncertainty	upper mag upper uncertainty	flame_flags Flags for the Apsis-FLAME results	val $r_\odot$	lower $r_\odot$ lower uncertainty	upper $r_\odot$ upper uncertainty	val L_sun Stellar luminosity	lower $L_\odot$ lower uncertainty	upper $L_\odot$ upper uncertainty

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