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V/137D/XHIP Extended Hipparcos Compilation (XHIP) (Anderson+, 2012)
XHIP catalog: astrometry, spectrography, space motions, exoplanets, photometry, and references (117955 rows)
  recno=20595
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ColumnValue  Explain   (UCD)
_RAJ200004 25 29.3890997 "h:m:s" Right ascension (FK5, Equinox=J2000.0) at Epoch=J2000, proper motions taken into account (pos.eq.ra)
_DEJ2000+17 55 40.466986 "d:m:s" Declination (FK5, Equinox=J2000.0) at Epoch=J2000, proper motions taken into account (pos.eq.dec)
_RAB195004 22 35.5560335 "h:m:s" Right ascension (FK4, Equinox=B1950.0) at Epoch=J1950, proper motions taken into account (pos.eq.ra)
_DEB1950+17 48 54.674115 "d:m:s" Declination (FK4, Equinox=B1950.0) at Epoch=J1950, proper motions taken into account (pos.eq.dec)
_Glon178.1174832428 deg Galactic longitude at Epoch=J1991.25, proper motions taken into account (pos.galactic.lon)
_Glat-21.2948976827 deg Galactic latitude at Epoch=J1991.25, proper motions taken into account (pos.galactic.lat)
20595recno 20595  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)

HIP 20648  (i) Hipparcos identifier (linked to details from HIP catalogs) (meta.id;meta.main)
CompAB  Component(s) (Note 1)   (meta.code.multip)
Classes**,*,*iC,V*,IR,UV,X  SIMBAD classifications (comma separated) (Note 2)   (src.class)
Gr1   Cluster or Association membership(s) (Note 3)   (meta.code.member)
RAJ2000066.37215595 deg (i) Right ascension (ICRS, Epoch=J1991.25) (pos.eq.ra;meta.main)
e_RAJ2000 0.47 mas Standard error on RA*cos(DEdeg) (stat.error;pos.eq.ra)
DEJ2000+17.92798892 deg (i) Declination (ICRS, Epoch=J1991.25) (pos.eq.dec;meta.main)
e_DEJ2000 0.30 mas Standard error on DE (stat.error;pos.eq.dec)
Plx 21.96 mas Trigonometric parallax (pos.parallax.trig)
e_Plx 0.51 mas Standard error on Plx (stat.error;pos.parallax)
pmRA 116.90 mas/yr Proper motion in RA*cos(DEdeg) (pos.pm;pos.eq.ra)
e_pmRA 1.60 mas/yr Standard error on pmRA (stat.error;pos.pm;pos.eq.ra)
pmDE -33.50 mas/yr Proper motion in Declination (pos.pm;pos.eq.dec)
e_pmDE 1.50 mas/yr Standard error on pmDE (stat.error;pos.pm;pos.eq.dec)
r_HIP2   [1/2] Reference for Hipparcos astrometry (Note 4)   (meta.ref;pos.frame)
r_pm2   [1/3] Reference for proper motion (Note 5)   (meta.ref;pos.frame)
GLon178.11748615 deg Galactic longitude (Note 6)   (pos.galactic.lon)
GLat-21.29489768 deg Galactic latitude (Note 6)   (pos.galactic.lat)
Dist 45.51 pc Heliocentric distance (Note 7)   (pos.distance)
e_Dist 2.3 % Distance error expressed as percentage (Note 8)   (stat.error)
pmGLon 100.60 mas/yr Proper motion in GLon*cos(GLat) (pos.pm)
pmGLat 68.32 mas/yr Proper motion in GLat (pos.pm)
X -42.4 pc Heliocentric distance towards Gal. center (pos.distance)
Y 1.4 pc Heliocentric distance towards Gal. rotation (pos.distance)
Z -16.5 pc Heliocentric distance towards N. Gal. Pole (pos.distance)
RGal7442 pc Galactocentric distance (Note 9)   (pos.distance;pos.galactocentric)
vT 26.2 km/s Transverse velocity (phys.veloc)
SpTypeA1V  Spectral type (MK, HD, or other) (src.spType)
Tc 31   ]0/140[ Temperature class codified (Note 10)   (src.spType)
Lc5   [1/6] Luminosity class codified (Note 11)   (src.class.luminosity)
RV 39.00 km/s Radial velocity (spect.dopplerVeloc;pos.heliocentric)
e_RV 0.10 km/s Standard error on RV (Note 12)   (stat.error)
q_RVA   [ABCD] Quality flag on RV (Note 13)   (meta.code.qual)
[Fe/H] 0.20 [Sun] Iron abundance (phys.abund.Fe)
e_[Fe/H] 9.99 [Sun] Standard error on [Fe/H] (Note 14)   (stat.error;phys.abund.Fe)
q_[Fe/H]C   [ABC] Quality flag on [Fe/H] (Note 15)   (meta.code.qual;phys.abund.Fe)
age  Gyr Age, in billions of years (time.age)
b_age  Gyr Lower confidence limit on age (time.age;stat.fit.param)
B_age  Gyr Upper confidence limit on age (time.age;stat.fit.param)
U -42.4 km/s Heliocentric velocity towards Gal. center (spect.dopplerVeloc;pos.heliocentric)
V -20.3 km/s Heliocentric velocity towards Gal. rotation (phys.veloc.rotat;pos.heliocentric)
W -0.4 km/s Heliocentric velocity towards N. Gal. Pole (spect.dopplerVeloc;em.IR.8-15um)
UVW 47.0 km/s Total heliocentric velocity (phys.veloc)
Dmin 25.40 pc Minimum distance at solar encounter (Note 16)   (pos.distance)
Tmin -786 kyr Timing of Dmin, in thousands of years (Note 17)   (time.epoch)
e 0.1409   Total orbital eccentricity (Note 18)   (src.orbital.eccentricity)
phi-109.7 deg [-180/180] Pericenter position angle (Note 18)   (src.orbital.periastron)
a 7232 pc Semi-major axis of orbit (Note 18)   (phys.size.smajAxis)
b 7160 pc Semi-minor axis of orbit (Note 18)   (phys.size.sminAxis)
c 1019 pc Focus-to-center distance of orbit (=a.e) (Note 18)   (pos.distance;src.orbital)
L 7088 deg Semilatus rectum of orbit (Note 18)   (src.orbital)
Rmin6213 pc Orbital radius at pericenter (Note 18)   (pos.distance;src.orbital)
Rmax 8251 pc Orbital radius at apocenter (Note 18)   (pos.distance;src.orbital)
Npl    Number of exoplanets (known in April 2012) (meta.number)
Mpl   Exoplanet discovery method(s) (Note 19)   (meta.code;obs)

SimbadSimbad  ask the Simbad data-base about this object (meta.ref)

Hpmag 4.321 mag Median magnitude in Hipparcos system (phot.mag;em.opt.V)
e_Hpmag 0.001 mag Standard error on Hpmag (stat.error;phot.mag;em.IR.H)
m_Hpmag*   [A-Z*-] Reference flag for Hpmag (Note 20)   (meta.code.multip)
Hpmax 4.32 mag Hpmag at maximum (5th percentile) (phot.mag;em.opt.V)
Hpmin 4.33 mag Hpmag at minimum (95th percentile) (phot.mag;em.IR.H)
Per  d Variability period (src.var)
HvarD mag [CDMPRU] Variability type (Note 21)   (meta.code;src.var)
Umag  mag Apparent magnitude in Johnson U (phot.mag;em.opt.U)
Bmag 4.349 mag Apparent magnitude in Johnson B (phot.mag;em.opt.B)
Vmag 4.30 mag Apparent magnitude in Johnson V (phot.mag;em.opt.V)
Rmag  mag Apparent magnitude in R (phot.mag;em.opt.R)
Imag 4.237 mag Apparent magnitude in I (phot.mag;em.opt.I)
Jmag 4.338 mag J selected default magnitude (Note 22)   (phot.mag;em.IR.J)
e_Jmag 0.316 mag J total magnitude uncertainty (Note 22)   (stat.error;phot.mag;em.IR.J)
Hmag 4.381 mag H selected default magnitude (Note 22)   (phot.mag;em.IR.H)
e_Hmag 0.238 mag H total magnitude uncertainty (Note 22)   (stat.error;phot.mag;em.IR.H)
Kmag 4.098 mag K selected default magnitude (Note 22)   (phot.mag;em.IR.K)
e_Kmag 0.029 mag K total magnitude uncertainty (Note 22)   (stat.error;phot.mag;em.IR.K)
2MASS04252936+1755404  2MASS source designation (linked to details from 2MASS-PSC catalog) (Note 22)   (meta.id.cross)
q2MDDA  JHK photometric quality flag (Note 22)   (meta.code.qual;phot)
B-V 0.049 mag Johnson B-V color index (phot.color;em.opt.B;em.opt.V)
e_B-V 0.007 mag Standard error on B-V (stat.error;phot.color;em.opt.B)
V-I 0.08 mag Color index in Cousins' system (phot.color;em.opt.V;em.opt.I)
e_V-I 0.03 mag Standard error on V-I (stat.error;phot.color;em.opt.V)
HpMag 1.031 mag Absolute Magnitude of Hpmag (Note 23)   (phot.mag;em.IR.H)
UMag  mag Absolute Magnitude in Johnson U (Note 23)   (phot.mag;em.opt.U)
BMag 1.06 mag Absolute Magnitude in Johnson B (Note 23)   (phys.magAbs;em.opt.B)
VMag 1.01 mag Absolute Magnitude in Johnson V (Note 23)   (phys.magAbs;em.opt.V)
RMag  mag Absolute Magnitude in R (Note 23)   (phys.magAbs;em.opt.R)
IMag 0.95 mag Absolute Magnitude in I (Note 23)   (phys.magAbs;em.opt.I)
JMag 1.05 mag Absolute Magnitude J (Note 23)   (phys.magAbs;em.IR.J)
HMag 1.09 mag Absolute Magnitude H (Note 23)   (phys.magAbs;em.IR.H)
KMag 0.81 mag Absolute Magnitude K (Note 23)   (phys.magAbs;em.IR.K)
Lum 35.89 Lsun Stellar luminosity (Note 23)   (phys.luminosity)
magmin 3.03 mag Apparent magnitude V at Tmin (main.dat) (phot.mag)
HD 27962   Henry Draper catalog identifier (meta.id)
CstTau  Constellation membership (meta.code.member)
Atlas 185  Millennium Star Atlas page number (meta.bib.page)
Coords04255n1793  RA, DE in compact format; n = + ; s = - (meta.id)
Name68 Tauri  Star name(s) (meta.id)
GrpNameHyades  Cluster or Association name(s) (linked to Group characteristics ) (meta.id.parent)
CompIDCCDM J04255+1755  Reference for Comp (main.dat) (meta.id)
rSpType2009A&A...501..297Z  Reference for SpType (main.dat) (Note 24)   (meta.ref;pos.frame)
r_RV564  Reference for RV (main.dat) (meta.ref;pos.frame)
r_[Fe/H]201,255,351,439  Reference(s) for [Fe/H] (main.dat) (meta.ref)
  
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