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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=2558293
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ColumnValue  Explain   (UCD)
_RAJ200006 22 41.9849472006 "h:m:s" Right ascension (FK5, Equinox=J2000.0) at Epoch=J2000, proper motions taken into account (pos.eq.ra)
_DEJ2000-17 57 21.304759999 "d:m:s" Declination (FK5, Equinox=J2000.0) at Epoch=J2000, proper motions taken into account (pos.eq.dec)
_RAB195006 20 29.8022079417 "h:m:s" Right ascension (FK4, Equinox=B1950.0) at Epoch=J1950, proper motions taken into account (pos.eq.ra)
_DEB1950-17 55 47.003325011 "d:m:s" Declination (FK4, Equinox=B1950.0) at Epoch=J1950, proper motions taken into account (pos.eq.dec)
_Glon226.0598433975613 deg Galactic longitude at Epoch=J1990, proper motions taken into account (pos.galactic.lon)
_Glat-14.2680405703887 deg Galactic latitude at Epoch=J1990, proper motions taken into account (pos.galactic.lat)
2558293recno 2558293  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)

IDTyc25938-2918-1  (i) Tycho-2 identifier (TYC1-TYC2-TYC3) (id) (meta.id;meta.main)
HIP 30324  (i) Hipparcos number (hip) (meta.id.cross)
TYC1 5938  TYC1 component from TYC or GSC (tyc1) (meta.id.part;meta.main)
TYC2 2918  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)
TYC5938029181  Numeric Tycho-2 identifier ((tyc1*1000000)+(tyc2*10)+(tyc3)) (id_tycho) (meta.id;meta.dataset)
IDTyc1H  Tycho-1 star (tyc) (meta.code)
RAT 95.67494750000 deg (i) Observed Tycho-2 Right Ascension (ICRS) at epoch 1990+EpRA1990 (ra) (pos.eq.ra;meta.main)
e_RAT 1.0 mas Uncertainty RA*cos(dec), of observed Tycho-2 RA (eradeg) (stat.error)
DET-17.95591660000 deg (i) Observed Tycho-2 Declination (ICRS) at epoch 1990+EpDE1990 (dec) (pos.eq.dec;meta.main)
e_DET 1.0 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 -3.5 mas/yr (i) Proper motion in right ascension, pmRA*cos(DE) (pm_ra) (pos.pm;pos.eq.ra)
e_pmRA 0.6 mas/yr Uncertainty proper motion in RA*cos(dec) (epmra) (stat.error;pos.pm;pos.eq.ra)
pmDE -0.5 mas/yr (i) Proper motion in Declination (pm_de) (pos.pm;pos.eq.dec)
e_pmDE 0.6 mas/yr Uncertainty of proper motion in Dec (epmde) (stat.error;pos.pm;pos.eq.dec)
EpRA1990 1.25 yr Epoch-1990 of RAdeg (ep_ra1990) (time.epoch)
EpDE1990 1.25 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    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)
pflagH  Mean position flag (pflag) (meta.code)
posflgH  Type of Tycho-2 solution (posflg) (meta.id;stat.fit)
CCDM   CCDM component identifier for HIP stars (ccdm) (meta.code.multip)
prox    Proximity indicator (prox) (meta.code)
BTmag 1.750 mag Tycho-2 BT magnitude (bt_mag) (phot.mag;em.opt.B)
e_BTmag 0.010 mag Uncertainty of BTmag (ebtmag) (stat.error)
VTmag 1.930 mag Tycho-2 VT magnitude (vt_mag) (phot.mag;em.opt.V)
e_VTmag 0.000 mag Uncertainty of VTmag (evtmag) (stat.error)
TDSC14803  (i) TDSC identifier for the system (sys_no) (meta.id)
cmpA  Component designation (cmp) (meta.id.part)
Nmain 1   Number of components in TDSC main catalogue (n_main) (meta.number)
Nsup1   Number of components in the TDSC supplement (n_sup) (meta.number)
magflgT  TDSC photometry flag (magflg) (meta.code)
WDS06227-1757  (i) WDS identifier for the system (wds) (meta.id.cross)
Note   TDSC notes (note) (meta.note)
HD 44743   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 95.67493728000 deg (i) Right Ascension (ICRS, epoch 2000) computed by CDS (pos.eq.ra)
_DE.icrs-17.95591798889 deg (i) Declination (ICRS, epoch 2000) computed by CDS (pos.eq.dec)
  
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