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  AAVSO Photometric All Sky Survey (APASS) DR9 (Henden+, 2016)
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1.II/336/apass9The APASS catalog (61176401 rows)

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)
  RAJ2000 deg (i) Right ascension in decimal degrees (J2000) (pos.eq.ra;meta.main)
  DEJ2000 deg (i) Declination in decimal degrees (J2000) (pos.eq.dec;meta.main)
  e_RAJ2000 arcsec [0/2.4] RA uncertainty (stat.error;pos.eq.ra)
  e_DEJ2000 arcsec [0/2.4] DEC uncertainty (stat.error;pos.eq.dec)
  Field   [20110001/9999988888] Field name (obs.field)
  nobs   [2/387] Number of observed nights (meta.number)
  mobs   [2/3476] Number of images for this field, usually nobs*5 (meta.number)
  B-V mag (n) [-7.5/13] B-V color index (phot.color;em.opt.B;em.opt.V)
  e_B-V mag (n) [0/10.1] B-V uncertainty (stat.error;phot.color;em.opt.B)
  Vmag mag (n) [5.5/27.4] Johnson V-band magnitude (phot.mag;em.opt.V)

ALL cols
(n) indicates a possible blank or NULL column(i)indexed column
  e_Vmag mag (n) [0/7] Vmag uncertainty (stat.error;phot.mag;em.opt.V)
  u_e_Vmag  (n) [0/1] Uncertainty flag on e_Vmag (Note 1)   (meta.code.error)
  Bmag mag (n) [5.4/27.3] Johnson B-band magnitude (phot.mag;em.opt.B)
  e_Bmag mag (n) [0/10] Bmag uncertainty (stat.error;phot.mag;em.opt.B)
  u_e_Bmag  (n) [0/1] Uncertainty flag on e_Bmag (Note 1)   (meta.code.error)
  g'mag mag (n) [5.9/24.2] g'-band AB magnitude, Sloan filter (phot.mag;em.opt.B)
  e_g'mag mag (n) [0/9.7] g'mag uncertainty (stat.error;phot.mag;em.opt.B)
  u_e_g'mag  (n) [0/1] Uncertainty flag on e_g'mag (Note 1)   (meta.code.error)
  r'mag mag (n) [5.1/23.9] r'-band AB magnitude, Sloan filter (phot.mag;em.opt.R)
  e_r'mag mag (n) [0/6.5] r'mag uncertainty (stat.error;phot.mag;em.opt.R)
  u_e_r'mag  (n) [0/1] Uncertainty flag on e_r'mag (Note 1)   (meta.code.error)
  i'mag mag (n) [4.2/29.1] i'-band AB magnitude, Sloan filter (phot.mag;em.opt.I)
  e_i'mag mag (n) [0/9.6] i'mag uncertainty (stat.error;phot.mag;em.opt.I)
  u_e_i'mag  (n) [0/1] Uncertainty flag on e_i'mag (Note 1)   (meta.code.error)

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