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Table: gaia_dr1.tgas_source
(The bold columns are indexed columns)
| Column Name | Description | Datatype |
|---|---|---|
| astrometric_delta_q | Hipparcos/Gaia data discrepancy (Hipparcos subset of TGAS only) | REAL |
| astrometric_excess_noise | Excess noise of the source | DOUBLE |
| astrometric_excess_noise_sig | Significance of excess noise | DOUBLE |
| astrometric_n_bad_obs_ac | Number of bad observations AC | INTEGER |
| astrometric_n_bad_obs_al | Number of bad observations AL | INTEGER |
| astrometric_n_good_obs_ac | Number of good observations AC | INTEGER |
| astrometric_n_good_obs_al | Number of good observations AL | INTEGER |
| astrometric_n_obs_ac | Total number of observations AC | INTEGER |
| astrometric_n_obs_al | Total number of observations AL | INTEGER |
| astrometric_primary_flag | Primary or secondard | SMALLINT |
| astrometric_priors_used | Type of prior used in the astrometric solution | INTEGER |
| astrometric_relegation_factor | Relegation factor | REAL |
| astrometric_weight_ac | Mean astrometric weight of the source in the AC direction | REAL |
| astrometric_weight_al | Mean astrometric weight of the source in the AL direction | REAL |
| b | Galactic latitude at epoch 2015.0 | DOUBLE |
| dec | Declination (ICRS) at epoch 2015.0 (deg) | DOUBLE |
| dec_error | Standard error of declination | DOUBLE |
| dec_parallax_corr | Correlation between declination and parallax | REAL |
| dec_pmdec_corr | Correlation between declination and proper motion in declination | REAL |
| dec_pmra_corr | Correlation between declination and proper motion in right ascension | REAL |
| duplicated_source | Source with duplicate sources | SMALLINT |
| ecl_lat | Ecliptic latitude at epoch 2015.0 | DOUBLE |
| ecl_lon | Ecliptic longitude at epoch 2015.0 | DOUBLE |
| hip | Hipparcos identifier | INTEGER |
| l | Galactic longitude at epoch 2015.0 | DOUBLE |
| matched_observations | Amount of observations matched to this source | SMALLINT |
| parallax | Absolute barycentric stellar parallax of the source at the reference epoch Epoch | DOUBLE |
| parallax_error | Standard error of parallax | DOUBLE |
| parallax_pmdec_corr | Correlation between parallax and proper motion in declination | REAL |
| parallax_pmra_corr | Correlation between parallax and proper motion in right ascension | REAL |
| phot_g_mean_flux | G-band mean flux | DOUBLE |
| phot_g_mean_flux_error | Error on G-band mean flux | DOUBLE |
| phot_g_mean_mag | G-band mean magnitude | DOUBLE |
| phot_g_n_obs | Number of observations contributing to G photometry | INTEGER |
| phot_variable_flag | Photometric variability flag | CHAR |
| pmdec | Proper motion in declination direction | DOUBLE |
| pmdec_error | Standard error of proper motion in declination direction | DOUBLE |
| pmra | Proper motion in right ascension direction | DOUBLE |
| pmra_error | Standard error of proper motion in right ascension direction | DOUBLE |
| pmra_pmdec_corr | Correlation between proper motion in right ascension and proper motion in declination | REAL |
| ra | Right ascension (ICRS) at epoch 2015.0 (deg) | DOUBLE |
| ra_dec_corr | Correlation between right ascension and declination | REAL |
| ra_error | Standard error of right ascension | DOUBLE |
| ra_parallax_corr | Correlation between right ascension and parallax | REAL |
| ra_pmdec_corr | Correlation between right ascention and proper motion in declination | REAL |
| ra_pmra_corr | Correlation between right ascention and proper motion in right ascension | REAL |
| random_index | Random index used to select subsets | BIGINT |
| ref_epoch | [2015.0] Reference epoch in Julian years | DOUBLE |
| scan_direction_mean_k1 | Mean position angle of scan directions across the source | REAL |
| scan_direction_mean_k2 | Mean position angle of scan directions across the source | REAL |
| scan_direction_mean_k3 | Mean position angle of scan directions across the source | REAL |
| scan_direction_mean_k4 | Mean position angle of scan directions across the source | REAL |
| scan_direction_strength_k1 | Degree of concentration of scan directions across the source | REAL |
| scan_direction_strength_k2 | Degree of concentration of scan directions across the source | REAL |
| scan_direction_strength_k3 | Degree of concentration of scan directions across the source | REAL |
| scan_direction_strength_k4 | Degree of concentration of scan directions across the source | REAL |
| solution_id | 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 | BIGINT |
| source_id | A unique single numerical identifier o f the source obtained from GaiaSource (for a detailed description see GaiaSource.sourceId) | BIGINT |
| tycho2_id | Tycho 2 identifier | CHAR |
