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=337479
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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)
_RAJ200004 18 14.15600 "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+50 17 50.1500 "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)
_RAB195004 14 28.20535 "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+50 10 32.4103 "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)
_Glon153.01901454 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 -0.08858287 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)
337479recno 337479  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)

RAJ200004 18 14.156 "h:m:s" (i) R.A. , at epoch mEp (J2000) (Note 1)   (pos.eq.ra;meta.main)
DEJ2000+50 17 50.15 "d:m:s" (i) Decl. , at epoch mEp (Note)   (pos.eq.dec;meta.main)
Bmag 4.66 mag Observed B magnitude (Note 2)   (phot.mag;em.opt.B)
mEp1903.914 yr Mean epoch of position (time.epoch)
Num 3  Number of images used for astrometry (meta.number)
e_RAJ2000 0.723 arcsec Standard deviation of Right Ascension (Note 3)   (stat.error;pos.eq.ra)
e_DEJ2000 0.483 arcsec Standard deviation of Declination (Note 3)   (stat.error;pos.eq.dec)
ACnum 1582228  (i) USNO generated identifier (meta.id;meta.main)
HIP 20070   Hipparcos number (Note 4)   (meta.id)
m_HIP   Hipparcos component identifier (Note 4)   (meta.code.multip)
TYC2333600243501  Tycho-2 identifier (Note 5)   (meta.id)
Vmag 4.600 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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