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 NOMAD Catalog (Zacharias+ 2005)
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1.I/297/outThe NOMAD-1 Catalog (1117612732 rows)
The Naval Observatory Merged Astrometric Dataset (NOMAD) contains astrometric and photometric data for over 1 billion stars derived from the Hipparcos (I/239), Tycho-2 (I/259), UCAC2 (I/289), and USNO-B1.0 (I/284) catalogs for astrometry and optical photometry, supplemented by 2MASS (II/246) near-infrared photometry.
An efficient remote query program findnomad1 is available in the cdsclient package, for Unix/Linux platforms

Query by Constraints constraints help applied on Columns (Output Order: + - )
ShowSortColumn  Constraint Explain   (UCD)
  NOMAD1 (char) NOMAD-identifier (Note 1)   (;meta.main)
  USNO-B1 (char) Identifier in USNO-B1 (Cat. I/284) (Note 1)   (
  UCAC2  (n) Number in UCAC2 (Cat. I/289) (
  Tycho-2 (char) Identification in Tycho-2 or Hipparcos (Note 2)   (
  f_Tycho-2 (char) [*] when distance NOMAD1/Tycho-2 > 1arcsec (meta.code)
  YM (char) [YM.] Existence in YB6 or 2MASS (Cat. II/246) (meta.note)
  RAJ2000 deg Right ascension in ICRS, Ep=J2000 (pos.eq.ra;meta.main)
  DEJ2000 deg Declination in ICRS, Ep=J2000 (pos.eq.dec;meta.main)
  r (char) [BCMYTH] Source of position (Note 3)   (meta.ref;pos.frame)
  e_RAJ2000 mas Mean error on RAdeg (at epRA) (stat.error;pos.eq.ra)
  e_DEJ2000 mas Mean error on DEdeg (at epDE) (stat.error;pos.eq.dec)

ALL cols
(n) indicates a possible blank or NULL column  
  pmRA mas/yr Proper motion in RA (*cos(Dec)) (;pos.eq.ra)
  e_pmRA mas/yr Mean error on pmRA (stat.error;;pos.eq.ra)
  pmDE mas/yr Proper motion in Declination (;pos.eq.dec)
  e_pmDE mas/yr Mean error on pmDE (stat.error;;pos.eq.dec)
  Bmag mag (n)Blue magnitude (phot.mag;em.opt.B)
  r_Bmag (char) [BCMYTHo] Origin of Bmag (Note 3)   (meta.ref;pos.frame)
  Vmag mag (n)Visual magnitude (phot.mag;em.opt.V)
  r_Vmag (char) [BCMYTH] Origin of Vmag (Note 3)   (meta.ref;pos.frame)
  Rmag mag (n)Red magnitude (phot.mag;em.opt.R)
  r_Rmag (char) [BCMYTHe] Origin of Rmag (Note 3)   (meta.ref;pos.frame)
  Jmag mag (n)Infrared J magnitude (from 2MASS) (phot.mag;em.IR.J)
  Hmag mag (n)Infrared H magnitude (from 2MASS) (phot.mag;em.IR.H)
  Kmag mag (n)Infrared K magnitude (from 2MASS) (phot.mag;em.IR.K)
  Xflags (char) [0-9a-f] Hexadecimal flags (Note 4)   (meta.code)
  R (char) [R*] Recommended (R) or Problematic (*) (Note 4)   (meta.note)

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