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I/247/ac2000 The AC2000 Catalogue (Urban+ 1997)
full AC J2000 catalog, split here into 14 files. (4621836 rows)
  recno=1867039
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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)
_RAJ200007 27 21.00600 "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+05 19 09.2800 "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)
_RAB195007 24 41.41875 "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+05 25 16.5720 "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)
_Glon212.25302977 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+10.40248679 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)
1867039recno 1867039  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)

RA(ICRS)07 27 21.006 "h:m:s" (i) Right Ascension (ICRS) at Epoch (hours) (pos.eq.ra;meta.main)
DE(ICRS)+05 19 09.28 "d:m:s" (i) Declination (ICRS) at Epoch (degrees) (pos.eq.dec;meta.main)
Bmag11.22 mag Magnitude from image diameters (phot.mag;em.opt.B)
Epoch1908.859 yr Mean epoch of position (time.epoch)
Num 2  Number of images used (meta.number)
e_RAs 5.274 arcsec Standard deviation of mean, RA (stat.error)
e_DEs35.443 arcsec Standard deviation of mean, Dec (stat.error)
AC2000 282902  (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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