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J/AJ/146/131
  UBVRI standard stars at +50° declination (Landolt, 2013)
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1.J/AJ/146/131/standards(c)UBVRI photometry of standard stars at Northern Declinations (Table2), and at the Celestial Equator (Table3), completed with accurate astrometry (Table5) (349 rows)
2.J/AJ/146/131/table6(c)Field centers for the standard star sequences (87 rows)
3.J/AJ/146/131/notesNotes (95 rows)

 
Query by Constraints constraints help applied on Columns (Output Order: + - )
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Column  Constraint Explain   (UCD)
  (ALL)recno  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)
  (1)R (char) Sky region: Northern declinations (table2), or celestial Equator (table3) (obs.field)
   (1+3)Name (char) (i) Standard star name (Note G1)   (meta.id;meta.main)
  (1)N (char) N indicates a note on this star (meta.ref.url)
  (1)<Vmag> mag Mean V band magnitude (phot.mag;em.opt.V)
  (1)e_<Vmag> mag (n) Mean error in <Vmag> (stat.error;phot.mag;em.opt.V)
  (1)<B-V> mag Mean B-V color index (phot.color;em.opt.B;em.opt.V)
  (1)e_<B-V> mag (n) Mean error in <B-V> (stat.error;phot.color;em.opt.B)
  (1)<U-B> mag Mean U-B color index (phot.color;em.opt.U;em.opt.B)
  (1)e_<U-B> mag (n) Mean error in <U-B> (stat.error;phot.color;em.opt.U)
  (1)<V-R> mag Mean V-R color index (phot.color;em.opt.V;em.opt.R)

ALL cols
    
(n) indicates a possible blank or NULL column(i)indexed column
  (1)e_<V-R> mag (n) Mean error in <V-R> (stat.error;phot.color;em.opt.V)
  (1)<R-I> mag (n) Mean R-I color index (phot.color;em.opt.R;em.opt.I)
  (1)e_<R-I> mag (n) Mean error in <R-I> (stat.error;phot.color;em.opt.R)
  (1)<V-I> mag (n) Mean V-I color index (phot.color;em.opt.V;em.opt.I)
  (1)e_<V-I> mag (n) Mean error in <V-I> (stat.error;phot.color;em.opt.V)
  (1)No  Number of times that each star was observed (meta.number)
  (1)Nn  Number of nights during which a star was observed (meta.number)
  (1+2)RAJ2000 "h:m:s" (i) Hour of Right Ascension (J2000) (Note 1)   (pos.eq.ra;meta.main)
  (1+2)DEJ2000 "d:m:s" (i) Degree of Declination (J2000) (Note 1)   (pos.eq.dec;meta.main)
  (1)UCAC4a (char) Identifier from UCAC4 catalog (cat. I/322) (meta.id)
  (1)UCAC4b (char) Second UCAC4 identifier for UCAC4 641-047816 (meta.id)
  (1)2MASS (char) 2MASS name (cat. II/246) (JHHMMSSss+DDMMSSs) (meta.id)
  (1)pmRA mas/yr Proper motion in Right Ascension (Note 1)   (pos.pm;pos.eq.ra)

ALL cols
    
(n) indicates a possible blank or NULL column(i)indexed column
  (1)e_pmRA mas/yr 1σ uncertainty in pmRA (stat.error;pos.pm;pos.eq.ra)
  (1)pmDE mas/yr Proper motion in Declination (Note 1)   (pos.pm;pos.eq.dec)
  (1)e_pmDE mas/yr 1σ uncertainty in pmDE (stat.error;pos.pm;pos.eq.dec)
  (1)SimbadName (char) Designation understandable by the Simbad data-base (meta.id)
  (2)Field (char) Field name (Note 1)   (obs.field)
  (2)FOV (char) arcmin Field of view (field size) (phys.angSize;instr.fov)
  (2)Ns  Number of stars in each field (meta.number)
  (2)Vmin mag Lower range in V magnitude (Note 3)   (phot.mag;em.opt.V)
  (2)Vmax mag (n) Upper range in V magnitude (Note 3)   (phot.mag;em.opt.V)
  (2)B-Vmin mag Lower range in (B-V) color index (Note 3)   (phot.color;em.opt.B;em.opt.V)
  (2)B-Vmax mag (n) Upper range in (B-V) color index (Note 3)   (phot.color;em.opt.B;em.opt.V)
  (2)U-Bmin mag Lower range in (U-B) color index (Note 3)   (phot.color;em.opt.U;em.opt.B)
  (2)U-Bmax mag (n) Upper range in (U-B) color index (Note 3)   (phot.color;em.opt.U;em.opt.B)
  (2)Standard (char) Which stars within a field are recommended as standard stars (meta.id;meta.main)
  (3)Text (char) Comments (object type and/or alternate name) (meta.id;src.class)

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