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I/247/ac2000 The AC2000 Catalogue (Urban+ 1997)
full AC J2000 catalog, split here into 14 files. (4621836 rows)
  recno=27256
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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 36 37.99300 "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+61 16 36.6200 "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 33 15.42560 "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+61 01 19.6243 "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)
_Glon128.33579747 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 -1.11981847 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)
27256recno 27256  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)

RA(ICRS)01 36 37.993 "h:m:s" (i) Right Ascension (ICRS) at Epoch (hours) (pos.eq.ra;meta.main)
DE(ICRS)+61 16 36.62 "d:m:s" (i) Declination (ICRS) at Epoch (degrees) (pos.eq.dec;meta.main)
Bmag 9.02 mag Magnitude from image diameters (phot.mag;em.opt.B)
Epoch1901.971 yr Mean epoch of position (time.epoch)
Num 2  Number of images used (meta.number)
e_RAs 0.158 arcsec Standard deviation of mean, RA (stat.error)
e_DEs 0.032 arcsec Standard deviation of mean, Dec (stat.error)
AC2000 1731407  (i) AC 2000 Number (meta.id;meta.main)
HIP 7497  (i) Hipparcos Number (Cat. I/239) (meta.id)
TYC403100185301  Tycho ID (Cat. I/239) (Note)   (meta.id)
ACRS2504566  ACRS number (Cat. I/171) (meta.id)
Vflag    [1] Verification Flag (Note)   (meta.note)
  
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