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I/337/tgas Gaia DR1 (Gaia Collaboration, 2016)
TGAS: Subset of GaiaSource comprising those stars in the Hipparcos and Tycho-2 Catalogues for which a full 5-parameter astrometric solution has been possible in Gaia Data Release (TgasSource) (Download Tgas Sources as vo tables, fits or csv here) (original column names in green) (2057050 rows)
  recno=1009923
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ColumnValue  Explain   (UCD)
_RAJ200011 26 29.645286431 "h:m:s" Right ascension (FK5, Equinox=J2000.0) at Epoch=J2000, proper motions taken into account (pos.eq.ra)
_DEJ2000-17 54 51.70007743 "d:m:s" Declination (FK5, Equinox=J2000.0) at Epoch=J2000, proper motions taken into account (pos.eq.dec)
_RAB195011 23 59.188106847 "h:m:s" Right ascension (FK4, Equinox=B1950.0) at Epoch=J1950, proper motions taken into account (pos.eq.ra)
_DEB1950-17 38 20.31880327 "d:m:s" Declination (FK4, Equinox=B1950.0) at Epoch=J1950, proper motions taken into account (pos.eq.dec)
_Glon275.992029377421 deg Galactic longitude at Epoch=J2015, proper motions taken into account (pos.galactic.lon)
_Glat+40.472013276957 deg Galactic latitude at Epoch=J2015, proper motions taken into account (pos.galactic.lat)
1009923recno 1009923  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)

hip 55825   Hipparcos identifier (hip) (meta.id.cross)
tycho2_id   Tycho 2 identifier (tycho2_id) (meta.id.cross)
solution_id1635378410781933568  Solution ID (solution_id) (Note G1)   (meta.id;meta.version)
source_id3546458297076978944  (i) Source ID (source_id) (Note G2)   (meta.id;meta.main)
random_index 781728  Random index used to select subsets (random_index) (Note G3)   (meta.code)
ref_epoch2015.0 yr [2015.0] Reference epoch in Julian years (ref_epoch) (Note G4)   (meta.ref;time.epoch)
ra171.6234504350 deg (i) Right ascension (ICRS) at epoch 2015.0 (ra) (pos.eq.ra;meta.main)
ra_error 0.241 mas (i) Standard error of right ascension (ra_error) (stat.error;pos.eq.ra)
dec-17.9144080743 deg (i) Declination (ICRS) at epoch 2015.0 (dec) (pos.eq.dec;meta.main)
dec_error 0.159 mas (i) Standard error of declination (dec_error) (stat.error;pos.eq.dec)
parallax 0.91 mas (i) Absolute barycentric stellar parallax of the source at the reference epoch Epoch (parallax) (pos.parallax)
parallax_error 0.28 mas (i) Standard error of parallax (parallax_error) (stat.error;pos.parallax)
pmRA -16.349 mas/yr (i) Proper motion in right ascension direction (pmRA) (Note G5)   (pos.pm;pos.eq.ra)
pmra_error 0.204 mas/yr (i) Standard error of proper motion in right ascension direction (pmra_error) (stat.error;pos.pm;pos.eq.ra)
pmdec -11.266 mas/yr (i) Proper motion in declination direction (pmdec) (Note G6)   (pos.pm;pos.eq.dec)
pmdec_error 0.140 mas/yr (i) Standard error of proper motion in declination direction (pmdec_error) (stat.error;pos.pm;pos.eq.dec)
ra_dec_corr-0.698  Correlation between right ascension and declination (ra_dec_corr) (stat.correlation)
ra_parallax_corr-0.068  Correlation between right ascension and parallax (ra_parallax_corr) (stat.correlation)
ra_pmra_corr-0.080  Correlation between right ascension and proper motion in right ascension (ra_pmra_corr) (stat.correlation)
ra_pmdec_corr 0.052  Correlation between right ascension and proper motion in declination (ra_pmdec_corr) (stat.correlation)
dec_parallax_corr 0.117  Correlation between declination and parallax (dec_parallax_corr) (stat.correlation)
dec_pmra_corr 0.074  Correlation between declination and proper motion in right ascension (dec_pmra_corr) (stat.correlation)
dec_pmdec_corr-0.044  Correlation between declination and proper motion in declination (dec_pmdec_corr) (stat.correlation)
parallax_pmra_corr 0.152  Correlation between parallax and proper motion in right ascension (parallax_pmra_corr) (stat.correlation)
parallax_pmdec_corr-0.026  Correlation between parallax and proper motion in declination (parallax_pmdec_corr) (stat.correlation)
pmra_pmdec_corr-0.548  Correlation between proper motion in right ascension and proper motion in declination (pmra_pmdec_corr) (stat.correlation)
astrometric_n_obs_al 235  Total number of observations AL (astrometric_n_obs_al) (Note G7)   (meta.number)
astrometric_n_obs_ac 235  Total number of observations AC (astrometric_n_obs_ac) (Note G8)   (meta.number)
astrometric_n_good_obs_al 235  Number of good observations AL (astrometric_n_good_obs_al) (Note G9)   (meta.number)
astrometric_n_good_obs_ac 228  Number of good observations AC (astrometric_n_good_obs_ac) (Note G9)   (meta.number)
astrometric_n_bad_obs_al 0  Number of bad observations AL (astrometric_n_bad_obs_al) (Note G10)   (meta.number)
astrometric_n_bad_obs_ac 7  Number of bad observations AC (astrometric_n_bad_obs_ac) (Note G10)   (meta.number)
astrometric_delta_q 4.35   Hipparcos/Gaia data discrepancy (Hipparcos subset of TGAS only) (astrometric_delta_q) (Note G11)   (stat.value)
astrometric_excess_noise 0.70 mas Excess noise of the source (astrometric_excess_noise) (Note G12)   (stat.value)
astrometric_excess_noise_sig 1.3e+03  Significance of excess noise (astrometric_excess_noise_sig) (Note G13)   (stat.value)
astrometric_primary_flag1   [1] Primary or secondary (astrometric_primary_flag) (Note G14)   (meta.code)
astrometric_relegation_factor 6.85  Relegation factor (astrometric_relegation_factor) (arith.factor)
astrometric_weight_al 1.962 mas-2 Mean astrometric weight of the source in the AL direction (astrometric_weight_al) (stat.weight;stat.mean)
astrometric_weight_ac 3.51e-05 mas-2 Mean astrometric weight of the source in the AC direction (astrometric_weight_ac) (stat.weight;stat.mean)
astrometric_priors_used3   [3/5] Type of prior used in in the astrometric solution (astrometric_priors_used) (Note G15)   (meta.code)
matched_observations 34  Amount of observations matched to this source (matched_observations) (Note G16)   (meta.number)
duplicated_source1   [0/1] Source with duplicate sources (duplicated_source) (Note G17)   (meta.code)
scan_direction_strength_k1 0.227   [0/1] Degree of concentration of scan directions across the source (scan_direction_strength_k1) (Note G18)   (meta.code)
scan_direction_strength_k2 0.753   [0/1] Degree of concentration of scan directions across the source (scan_direction_strength_k2) (Note G18)   (meta.code)
scan_direction_strength_k3 0.217   [0/1] Degree of concentration of scan directions across the source (scan_direction_strength_k3) (Note G18)   (meta.code)
scan_direction_strength_k4 0.428   [0/1] Degree of concentration of scan directions across the source (scan_direction_strength_k4) (Note G18)   (meta.code)
scan_direction_mean_k1-128.38786000 deg Mean position angle of scan directions across the source (scan_direction_mean_k1) (Note G19)   (meta.code)
scan_direction_mean_k2 28.86523000 deg Mean position angle of scan directions across the source (scan_direction_mean_k2) (Note G19)   (meta.code)
scan_direction_mean_k3-19.27797300 deg Mean position angle of scan directions across the source (scan_direction_mean_k3) (Note G19)   (meta.code)
scan_direction_mean_k4 32.33348500 deg Mean position angle of scan directions across the source (scan_direction_mean_k4) (Note G19)   (meta.code)
phot_g_n_obs 268  Number of observations contributing to G photometry (phot_g_n_obs) (meta.number)
phot_g_mean_flux 382799.32053 e-/s (i) G-band mean flux (phot_g_mean_flux) (phot.flux;stat.mean;em.opt)
phot_g_mean_flux_error 6013.75248 e-/s (i) Error on G-band mean flux (phot_g_mean_flux_error) (stat.error)
phot_g_mean_mag11.567 mag (i) G-band mean magnitude (phot_g_mean_mag) (Note G20)   (phot.mag;stat.mean;em.opt)
phot_variable_flagNOT_AVAILABLE  Photometric variability flag (phot_variable_flag) (Note G21)   (meta.code;src.var)
l275.9920318680 deg (i) Galactic longitude at epoch 2015.0 (l) (pos.galactic.lon)
b 40.4720147958 deg (i) Galactic latitude at epoch 2015.0 (b) (pos.galactic.lat)
ecl_lon179.7065029362 deg Ecliptic longitude at epoch 2015.0 (ecl_lon) (pos.ecliptic.lon)
ecl_lat-19.7156005588 deg Ecliptic latitude at epoch 2015.0 (ecl_lat) (pos.ecliptic.lat)

_RA.icrs171.6235220268 deg (i) Right Ascension (ICRS, epoch 2000) computed by CDS (pos.eq.ra)
_DE.icrs-17.9143611326 deg (i) Declination (ICRS, epoch 2000) computed by CDS (pos.eq.dec)
  
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