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J/MNRAS/397/1073
  UBVI photometry in NGC 2587 (Piatti+, 2009)
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2009MNRAS.397.1073P
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1 annotation(s) 		img(gal)
1.J/MNRAS/397/1073/table3CCD UBVI data of stars in the field of NGC 2587 (4406 rows)

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ShowSortColumn  Constraint Explain   (UCD)
  recno  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)
  Seq   [1/4406] Sequential number (meta.record)
  Xpos pix X position (Note 1)   (pos.cartesian.x;instr.det)
  Ypos pix Y position (Note 1)   (pos.cartesian.y;instr.det)
  Vmag mag V magnitude (phot.mag;em.opt.V)
  e_Vmag mag rms uncertainty on Vmag (stat.error;phot.mag;em.opt.V)
  o_Vmag  Number of measurements in V band (meta.number)
  U-B mag (n) U-B colour index (phot.color;em.opt.U;em.opt.B)
  e_U-B mag (n) rms uncertainty on U-B (stat.error;phot.color;em.opt.U)
  o_U-B  Number of measurements in U-B (meta.number)
  B-V mag (n) B-V colour index (phot.color;em.opt.B;em.opt.V)
  e_B-V mag (n) rms uncertainty on B-V (stat.error;phot.color;em.opt.B)
  o_B-V  Number of measurements in B-V (meta.number)
  V-I mag (n) V-I colour index (phot.color;em.opt.V;em.opt.I)
  e_V-I mag (n) rms uncertainty on V-I (stat.error;phot.color;em.opt.V)
  o_V-I  Number of measurements in V-I (meta.number)
  _RA deg (i) Position computed from a comparison with UCAC2 (cat. I/289) (σ=0.25'') (right ascension part) (pos.eq.ra;meta.main)
  _DE deg (i) Position computed from a comparison with UCAC2 (cat. I/289) (σ=0.25'') (declination part) (pos.eq.dec;meta.main)

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Annotations on J/MNRAS/397/1073
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Posted by bskiff (2011/08/12 19:18:35)
[J/MNRAS/397/1073/table3]
The main data table contains large numbers of pairs
of entries for the same stars. They are separated by ~1"
and have similar but not identical photometry, based on
different images in the dataset, which were obviously not
well linked astrometrically.
Analysis of the results should also take note of the
transformation equations 1 to 5 in the paper, notably the
large (~0.055 mag) zero-point uncertainties, and the
anomalously low V-band extinction coefficient. Such problems
are not uncommon with single-night photometry.

\Brian Skiff
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