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 The ACT Reference Catalog (Urban+ 1997)
Post annotation
1.I/246/act Full ACT catalog, originally split into 48 files, each 30min wide (Note) (988758 rows)
Direct links to the Hipparcos and Tycho data (catalog I/239) are provided when relevant

Query by Constraints constraints help applied on Columns (Output Order: + - )
ShowSortColumn  Constraint Explain   (UCD)
  recno  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)
  RA(ICRS) "h:m:s" Right Ascension ICRS, Epoch=J2000.0 (hours) (pos.eq.ra;meta.main)
  DE(ICRS) "d:m:s" Declination ICRS, Epoch=J2000.0 (sign) (pos.eq.dec;meta.main)
  pmRA s/yr Proper Motion in RA, (sec of time/yr) (;pos.eq.ra)
  pmDE arcsec/yrProper Motion in Dec, arcsec/yr) (;pos.eq.dec)
  e_RAs mas (n)Stand. dev. of RA at Epoch 1991.25 from Tycho (T14) (stat.error)
  e_DEs mas (n)Stand. dev. of Dec at Epoch 1991.25 from Tycho (T15) (stat.error)
  e_pmRA mas/yr (n)Stand. dev. of Proper motion (RA), (stat.error)
  e_pmDE mas/yr (n)Stand. dev. of Proper motion (DE), (stat.error)
  BTmag mag (n)Blue magnitude from Tycho (T32) (phot.mag;em.opt.B)
  VTmag mag (n)Visual magnitude from Tycho (T34) (phot.mag;em.opt.V)

ALL cols
(n) indicates a possible blank or NULL column  
  B-V mag (n)Johnson B-V from Tycho (T37) (phot.color;em.opt.B;em.opt.V)
  flag1 (char) [X] Astrometric Quality flag (T10) (Note)   (meta.note)
  flag2 (char) [1-8] Quality flag (T40) (Note)   (meta.note)
  flag3 (char) [GN] Known variability flag (T47) (Note)   (meta.code;src.var)
  flag4 (char) [UVW] Variability from Tycho (T48) (Note)   (meta.code;src.var)
  flag5 (char) [YZ] Duplicity from Tycho (T49) (Note)   (meta.note)
  TYC (char) Tycho ID, embedded zeros for blanks (;meta.main)
  AC2000  AC 2000 Number (
  BD (char) BD identifier (T54) (
  CD (char) CD identifier (T55) (
  CPD (char) CPD identifier (T56) (
  HD  (n)Henry Draper Number (T53) (
  HIP  (n)Hipparcos Number (T31) (

ALL cols
(n) indicates a possible blank or NULL column  
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