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I/350/tyc2tdsc Gaia EDR3 (Gaia Collaboration, 2020)
Tycho-2 merged with the TDSC catalog and TDSC supplement (2561887 rows)
  recno=276208
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ColumnValue  Explain   (UCD)
_RAJ200004 47 06.2238672000 "h:m:s" Right ascension (FK5, Equinox=J2000.0) at Epoch=J2000, proper motions taken into account (pos.eq.ra)
_DEJ2000+16 58 42.899016000 "d:m:s" Declination (FK5, Equinox=J2000.0) at Epoch=J2000, proper motions taken into account (pos.eq.dec)
_RAB195004 44 13.2019209761 "h:m:s" Right ascension (FK4, Equinox=B1950.0) at Epoch=J1950, proper motions taken into account (pos.eq.ra)
_DEB1950+16 53 23.500800272 "d:m:s" Declination (FK4, Equinox=B1950.0) at Epoch=J1950, proper motions taken into account (pos.eq.dec)
_Glon182.2987695612093 deg Galactic longitude at Epoch=J1990, proper motions taken into account (pos.galactic.lon)
_Glat-17.8369089281423 deg Galactic latitude at Epoch=J1990, proper motions taken into account (pos.galactic.lat)
276208recno 276208  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)

IDTyc21271-1233-1  (i) Tycho-2 identifier (TYC1-TYC2-TYC3) (id) (meta.id;meta.main)
HIP   (i) Hipparcos number (hip) (meta.id.cross)
TYC1 1271  TYC1 component from TYC or GSC (tyc1) (meta.id.part;meta.main)
TYC2 1233  TYC2 component from TYC or GSC (tyc2) (meta.id.part;meta.main)
TYC3 1  TYC2 component from TYC or GSC (tyc3) (meta.id.part;meta.main)
TYC1271012331  Numeric Tycho-2 identifier ((tyc1*1000000)+(tyc2*10)+(tyc3)) (id_tycho) (meta.id;meta.dataset)
IDTyc1   Tycho-1 star (tyc) (meta.code)
RAT 71.77593278000 deg (i) Observed Tycho-2 Right Ascension (ICRS) at epoch 1990+EpRA1990 (ra) (pos.eq.ra;meta.main)
e_RAT 88.4 mas Uncertainty RA*cos(dec), of observed Tycho-2 RA (eradeg) (stat.error)
DET+16.97858306000 deg (i) Observed Tycho-2 Declination (ICRS) at epoch 1990+EpDE1990 (dec) (pos.eq.dec;meta.main)
e_DET120.9 mas Uncertainty of observed Tycho-2 Dec (ededeg) (stat.error)
RAmdeg  deg Mean Right Ascension (ICRS) at Ep=J2000 (ra_mdeg) (pos.eq.ra)
e_RAmdeg  mas Uncertainty RA*cos(dec),at mean epoch (eramdeg) (stat.error)
DEmdeg  deg Mean Declination (ICRS) at Ep=J2000 (de_mdeg) (pos.eq.dec)
e_DEmdeg  mas Uncertainty of Dec at mean epoch (edemdeg) (stat.error)
pmRA  mas/yr (i) Proper motion in right ascension, pmRA*cos(DE) (pm_ra) (pos.pm;pos.eq.ra)
e_pmRA  mas/yr Uncertainty proper motion in RA*cos(dec) (epmra) (stat.error;pos.pm;pos.eq.ra)
pmDE  mas/yr (i) Proper motion in Declination (pm_de) (pos.pm;pos.eq.dec)
e_pmDE  mas/yr Uncertainty of proper motion in Dec (epmde) (stat.error;pos.pm;pos.eq.dec)
EpRA1990 1.79 yr Epoch-1990 of RAdeg (ep_ra1990) (time.epoch)
EpDE1990 1.39 yr Epoch-1990 of DEdeg (ep_de1990) (time.epoch)
EpRAmdeg  yr Mean epoch of RAmdeg (epram) (time.epoch)
EpDEmdeg  yr Mean epoch of DEmdeg (epdem) (time.epoch)
Num    Number of positions used for forming mean data (num) (meta.number)
Corr-0.3   Correlation (RAdeg,DEdeg) (corr) (stat.correlation;pos.eq.ra;pos.eq.dec)
q_RAmdeg    Goodness of fit for mean RA (qramdeg) (meta.code.qual)
q_DEmdeg    Goodness of fit for mean DE (qdemdeg) (meta.code.qual)
q_pmDE    Goodness of fit for pmDe (qpmde) (meta.code.qual)
q_pmRA    Goodness of fit for pmRa (qpmra) (meta.code.qual)
pflagX  Mean position flag (pflag) (meta.code)
posflg   Type of Tycho-2 solution (posflg) (meta.id;stat.fit)
CCDM   CCDM component identifier for HIP stars (ccdm) (meta.code.multip)
prox999   Proximity indicator (prox) (meta.code)
BTmag13.030 mag Tycho-2 BT magnitude (bt_mag) (phot.mag;em.opt.B)
e_BTmag 0.368 mag Uncertainty of BTmag (ebtmag) (stat.error)
VTmag11.570 mag Tycho-2 VT magnitude (vt_mag) (phot.mag;em.opt.V)
e_VTmag 0.149 mag Uncertainty of VTmag (evtmag) (stat.error)
TDSC   (i) TDSC identifier for the system (sys_no) (meta.id)
cmp   Component designation (cmp) (meta.id.part)
Nmain    Number of components in TDSC main catalogue (n_main) (meta.number)
Nsup    Number of components in the TDSC supplement (n_sup) (meta.number)
magflg   TDSC photometry flag (magflg) (meta.code)
WDS   (i) WDS identifier for the system (wds) (meta.id.cross)
Note   TDSC notes (note) (meta.note)
HD    HD identifier for TDSC entries (hd) (meta.id.cross)
rcmp   Reference component for position angle and separation (rcmp) (meta.id.assoc)
PA  deg Position angle of the present component (cmp) with respect to the reference component (rcmp) (pa) (pos.posAng)
e_PA  deg Uncertainty of the position angle (e_pa) (stat.error)
Sep  arcsec Separation of the present component (cmp) with respect to the reference component (rcmp) (sep) (pos.angDistance)
e_Sep  mas Uncertainty of the separation (e_sep) (stat.error)
e_PA.Sep    Uncertainty of the position angle * separation (epasep) (stat.error)

_RA.icrs 71.77593278000 deg (i) Right Ascension (ICRS, epoch 2000) computed by CDS (pos.eq.ra)
_DE.icrs+16.97858306000 deg (i) Declination (ICRS, epoch 2000) computed by CDS (pos.eq.dec)
  
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