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VizieR

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I/247/ac2000 The AC2000 Catalogue (Urban+ 1997)
full AC J2000 catalog, split here into 14 files. (4621836 rows)
  recno=1487837
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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)
_RAJ200005 45 01.40200 "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+12 53 18.9600 "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)
_RAB195005 42 12.42266 "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+12 52 07.3718 "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)
_Glon193.71974903 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 -8.40655127 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)
1487837recno 1487837  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)

RA(ICRS)05 45 01.402 "h:m:s" (i) Right Ascension (ICRS) at Epoch (hours) (pos.eq.ra;meta.main)
DE(ICRS)+12 53 18.96 "d:m:s" (i) Declination (ICRS) at Epoch (degrees) (pos.eq.dec;meta.main)
Bmag 8.96 mag Magnitude from image diameters (phot.mag;em.opt.B)
Epoch1910.821 yr Mean epoch of position (time.epoch)
Num 2  Number of images used (meta.number)
e_RAs 0.018 arcsec Standard deviation of mean, RA (stat.error)
e_DEs 0.077 arcsec Standard deviation of mean, Dec (stat.error)
AC2000 475728  (i) AC 2000 Number (meta.id;meta.main)
HIP 27116  (i) Hipparcos Number (Cat. I/239) (meta.id)
TYC 72300051901  Tycho ID (Cat. I/239) (Note)   (meta.id)
ACRS1052561  ACRS number (Cat. I/171) (meta.id)
Vflag    [1] Verification Flag (Note)   (meta.note)
  
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