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I/247/ac2000 The AC2000 Catalogue (Urban+ 1997)
full AC J2000 catalog, split here into 14 files. (4621836 rows)
  recno=298468
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Note: Detailed information 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)
_RAJ200001 46 11.70000 "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+56 30 45.4900 "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)
_RAB195001 42 53.67289 "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+56 15 46.1695 "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)
_Glon130.47039726 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 -5.55553981 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)
298468recno 298468  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)

RA(ICRS)01 46 11.700 "h:m:s" (i) Right Ascension (ICRS) at Epoch (hours) (pos.eq.ra;meta.main)
DE(ICRS)+56 30 45.49 "d:m:s" (i) Declination (ICRS) at Epoch (degrees) (pos.eq.dec;meta.main)
Bmag11.82 mag Magnitude from image diameters (phot.mag;em.opt.B)
Epoch1917.928 yr Mean epoch of position (time.epoch)
Num 1  Number of images used (meta.number)
e_RAs  arcsec Standard deviation of mean, RA (stat.error)
e_DEs  arcsec Standard deviation of mean, Dec (stat.error)
AC2000 1736145  (i) AC 2000 Number (meta.id;meta.main)
HIP   (i) Hipparcos Number (Cat. I/239) (meta.id)
TYC   Tycho ID (Cat. I/239) (Note)   (meta.id)
ACRS   ACRS number (Cat. I/171) (meta.id)
Vflag    [1] Verification Flag (Note)   (meta.note)
  
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