VizieR

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VizieR

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I/275/ac2002 The AC 2000.2 Catalogue (Urban+ 2001)
All 4,621,751 stars from the AC2000.2 Catalogue (Detailed introduction) (4621751 rows)
  recno=1620654
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Note: Detailed introduction can be found in intro.tex (see also http://aries.usno.navy.mil/ad/ac.html) Direct links to Hipparcos and Tycho observations are provided from the relevant columns.

ColumnValue  Explain   (UCD)
_RAJ200016 08 04.75800 "h:m:s" Right ascension (FK5, Equinox=J2000.0) (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.eq.ra)
_DEJ2000+17 02 49.5900 "d:m:s" Declination (FK5, Equinox=J2000.0) (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.eq.dec)
_RAB195016 05 49.08822 "h:m:s" Right ascension (FK4, Equinox=B1950.0) (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.eq.ra)
_DEB1950+17 10 43.9811 "d:m:s" Declination (FK4, Equinox=B1950.0) (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.eq.dec)
_Glon031.01724699 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+43.63858753 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)
1620654recno 1620654  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)

RAJ200016 08 04.758 "h:m:s" (i) R.A. , at epoch mEp (J2000) (Note 1)   (pos.eq.ra;meta.main)
DEJ2000+17 02 49.59 "d:m:s" (i) Decl. , at epoch mEp (Note)   (pos.eq.dec;meta.main)
Bmag 6.17 mag Observed B magnitude (Note 2)   (phot.mag;em.opt.B)
mEp1898.868 yr Mean epoch of position (time.epoch)
Num 3  Number of images used for astrometry (meta.number)
e_RAJ2000 0.068 arcsec Standard deviation of Right Ascension (Note 3)   (stat.error;pos.eq.ra)
e_DEJ2000 0.190 arcsec Standard deviation of Declination (Note 3)   (stat.error;pos.eq.dec)
ACnum 554124  (i) USNO generated identifier (meta.id;meta.main)
HIP 79043   Hipparcos number (Note 4)   (meta.id)
m_HIPA  Hipparcos component identifier (Note 4)   (meta.code.multip)
TYC2150800127301  Tycho-2 identifier (Note 5)   (meta.id)
Vmag 5.097 mag V magnitude (Note 2)   (phot.mag;em.opt.V)
magflg    [1,3] Magnitude warning flag (Note 6)   (meta.code)
verflg    [1] Verification flag (Note 7)   (meta.code)
  
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