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J/A+AS/133/387      NGC 1817 and NGC 1807 proper motions (Balaguer-Nunnez+ 1998)
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Determination of proper motions and membership of the
open clusters NGC 1817 and NGC 1807
       Balaguer-Nunnez L., Tian K.P., Zhao J.L.
      <Astron. Astrophys. Suppl. Ser. 133, 387 (1998)>
      =1998A&AS..133..387B      (SIMBAD/NED BibCode)
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ADC_Keywords: Clusters, open ; Proper motions
Keywords: open clusters and associations: individual: NGC 1817, NGC 1807 -
          astrometry

Description:
    Relative proper motions, their corresponding errors and membership
    probabilities of 722 stars in the open cluster NGC 1817 region are
    given. Equatorial coordinates were computed using Tycho Catalog
    (Cat. <I/239>) as reference stars. Forty stars from this catalog are
    in the region under study. The cross-identification of this 40 stars
    are given as notes. Only 15 stars were found in this region from the
    PPM Catalog (Cat. <I/146>), and their respective identification is
    also included in the note5.dat file.

File Summary:
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  FileName  Lrecl  Records  Explanations
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ReadMe         80        .  This file
table5.dat    112      722  Relative proper motions and membership probabilities
                             of 722 stars of NGC 1817 and NGC 1807
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See also:
   I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
   I/146 : Positions and Proper Motions - North (Roeser+, 1988)

Byte-by-byte Description of file: table5.dat
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   Bytes Format Units     Label     Explanations
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   1-  5  I5    ---       Seq       Sequential identification number
   6- 12  F7.3  cm        xpos      x-plate coordinate (towards East)
  13- 19  F7.3  cm        ypos      y-plate coordinate (towards North)
  21- 22  I2    h         RAh       Right ascension (J2000)
  24- 25  I2    min       RAm       Right ascension (J2000)
  27- 32  F6.3  s         RAs       Right ascension (J2000)
      34  A1    ---       DE-       Declination sign
  35- 36  I2    deg       DEd       Declination (J2000)
  38- 39  I2    arcmin    DEm       Declination (J2000)
  40- 45  F6.2  arcsec    DEs       Declination (J2000)
  47- 54  F8.3  mas/yr    pmx       Proper motion in x
  56- 63  F8.3  mas/yr    pmy       Proper motion in y
  65- 69  F5.3  mas/yr  e_pmx       error in PMx
  71- 75  F5.3  mas/yr  e_pmy       error in PMy
  78- 81  F4.2  ---       Pngc1817  [0,1] Probability NGC 1817 cluster star
  83- 86  F4.2  ---       Pngc1807  [0,1] Probability NGC 1807 cluster star
  88- 91  F4.2  ---       Pfield    [0,1] Probability Field star
  93- 94  I2    ---       W         Number of plate pairs used
  96-104  A9    ---       TYC       Tycho (Cat. <I/239>) number
 107-112  I6    ---       PPM       ? PPM (Cat. <I/146>) number
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Acknowledgements: Lola Balaguer-Nunnez <lbalague@pchpc3.am.ub.es>
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(End)                                         Patricia Bauer [CDS]   02-Jul-1998