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VizieR

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V/137D/groups Extended Hipparcos Compilation (XHIP) (Anderson+, 2012)
Statistics on open clusters and stellar associations (87 rows)
  recno=15
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ColumnValue  Explain   (UCD)
_RAJ200009 15 33.6 "h:m:s" Right ascension (FK5, Equinox=J2000.0) at Epoch=J2000, proper motions taken into account (pos.eq.ra)
_DEJ2000-45 07 48 "d:m:s" Declination (FK5, Equinox=J2000.0) at Epoch=J2000, proper motions taken into account (pos.eq.dec)
_RAB195009 13 44.2 "h:m:s" Right ascension (FK4, Equinox=B1950.0) at Epoch=J1950, proper motions taken into account (pos.eq.ra)
_DEB1950-44 55 16 "d:m:s" Declination (FK4, Equinox=B1950.0) at Epoch=J1950, proper motions taken into account (pos.eq.dec)
_Glon268.1014 deg Galactic longitude (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.galactic.lon)
_Glat+02.6465 deg Galactic latitude (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.galactic.lat)
15recno 15  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)

GrpNamePlatais 9  (i) Group name (linked to Hipparcos members ) (meta.id;meta.main)
AltNamePlatais 9  Alternative group name (meta.id)
N 7  Number of Hiipparcos candidate stars (meta.number)
n 8.0   [3.5/16] Separation parameter (Note 27)   (src.class.richness)
Streamyoung stars  Kinematic group (Note 28)   (meta.id.parent)
RAJ2000138.89 deg (i) Group mean right ascension (ICRS) (pos.eq.ra;meta.main)
e_RAJ2000 0.47 deg Standard error on RA*cos(DEdeg) (stat.error;pos.eq.ra)
DEJ2000-45.13 deg (i) Group mean declination (ICRS) (pos.eq.dec;meta.main)
e_DEJ2000 0.76 deg Standard error on DE (stat.error;pos.eq.dec)
Dist 178.9 pc Group mean parallax distance (pos.distance;pos.heliocentric)
e_Dist 7.5 pc Standard error on Dist (stat.error)
pmRA -24.2 mas/yr Group mean proper motion in RA*cos(DEdeg) (pos.pm;pos.eq.ra)
e_pmRA 0.4 mas/yr Standard error on pmRA (stat.error;pos.pm;pos.eq.ra)
pmDE 13.0 mas/yr Mean proper motion in declination (pos.pm;pos.eq.dec)
e_pmDE 0.7 mas/yr Standard error on pmDE (stat.error;pos.pm;pos.eq.dec)
RV 16.9 km/s Group mean radial velocity (spect.dopplerVeloc;stat.mean)
e_RV 1.2 km/s Standard error on radial velocity (stat.error)
s_RAJ2000 1.24 deg Group width on RA*cos(DEdeg) (1-σ) (stat.variance)
s_DEJ2000 2.02 deg Group width on DE (1-σ) (stat.variance)
s_Dist 19.9 pc Group width on Dist (1-σ) (stat.variance)
s_pmRA 1.1 mas/yr Group width on pmRA (1-σ) (stat.variance)
s_pmDE 2.0 mas/yr Group width on pmDE (1-σ) (stat.variance)
s_RV 2.4 km/s Group width on radial velocity (stat.variance)
rad 6.9 pc Physical radius (1-σ) (phys.size.radius)
arad 2.2 deg Angular radius (1-σ) (phys.angSize)
X -5.8 pc Heliocentric distance towards Gal. center (pos.distance)
e_X 1.9 pc Standard error on X (stat.error;pos.cartesian.x)
Y-178.7 pc Heliocentric distance towards Gal. rotation (pos.distance)
e_Y 7.2 pc Standard error on Y (stat.error;pos.cartesian.y)
Z 8.3 pc Heliocentric distance towards N. Gal. Pole (pos.distance)
e_Z 1.9 pc Standard error on Z (stat.error;src.redshift)
U-21.2 km/s Heliocentric velocity towards Gal. center (spect.dopplerVeloc;pos.heliocentric)
e_U 0.3 km/s Standard error on U (stat.error;pos.cartesian.x)
V-16.2 km/s Heliocentric velocity towards Gal. rotation (phys.veloc.rotat;pos.heliocentric)
e_V 1.1 km/s Standard error on V (stat.error;pos.cartesian.y)
W -6.4 km/s Heliocentric velocity towards N. Gal. Pole (spect.dopplerVeloc;em.IR.8-15um)
e_W 0.8 km/s Standard error on W (stat.error;pos.cartesian.z)
s_X 5.0 pc Group width on X (1-σ) (stat.variance)
s_Y 19.0 pc Group width on Y (1-σ) (stat.variance)
s_Z 5.0 pc Group width on Z (1-σ) (stat.variance)
s_U 0.6 km/s Group width on U (1-σ) (stat.variance)
s_V 2.2 km/s Group width on V (1-σ) (stat.variance)
s_W 1.6 km/s Group width on W (1-σ) (stat.variance)
[Fe/H]  [Sun] Iron abundance (phys.abund.Fe)
e_[Fe/H]  [Sun] Standard error on [Fe/H] (stat.error;phys.abund.Fe)
n_[Fe/H]    Number of Hipparcos member stars with [Fe/H] (meta.note)
E(B-V)1 0.00 mag Color excess in B-V, CDS Cat. B/ocl (phot.color.excess)
E(B-V)2  mag Color excess in B-V, CDS Cat. J/A+A/477/165 (phot.color.excess)
  
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