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J/A+AS/118/105      Pluto 1991-1994 observations (Ryl'kov+, 1996)
Photographic observations of Pluto 1991-1994 with the Baldone Schmidt telescope.
       Ryl'kov V.P., Dement'eva A.A., Alksnis A., Straume J.I.
      <Astron. Astrophys. Suppl. Ser. 118, 105 (1996)>
      =1996A&AS..118..105R      (SIMBAD/NED BibCode)
ADC_Keywords: Planets ; Positional data

Keywords: astrometry - planets and satellites: individual: Pluto


Description:
    55 equatorial geocentric coordinates of Pluto from the photographic
    observations for 1991-1994 are presented in the table. The
    observations were carried out by Latvian astronomers using the
    80/120/240 cm Schmidt telescope at Baldone near Riga. 34 plates were
    measured and the positions of Pluto were reduced by using the 12-21
    reference stars from catalogue of southern stars FOCAT-S, created at
    Pulkovo. The mean reduction errors vary from 0.23" to 0.34" for both
    coordinates. The obtained Pluto positions were compared with the
    ephemeris JPL DE200 (the residuals (O-C) were calculated). The
    increase of the average annual (O-C) residuals in RA, already noticed
    in previous works by the Pulkovo authors, is confirmed. From
    observations, represented in 1994 the (O-C) residuals with respect to
    DE200 have reached in RA +2.32±0.07" and in Dec. -0.74±0.07". More
    detailed information on obtaining the Pluto positions is given in
    Ryl'kov (1993) and Ryl'kov et.al. (1993).

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2            75       55   Equatorial geocentric coordinates of Pluto from
                              the observations 1991-1994 with the
                              Baldone Schmidt telescope.


Byte-by-byte Description of file: table2

   Bytes Format     Units   Label     Explanations

   1-  5  I5        ---     No        Plate number, photographed with
                                       Schmidt telescope
   8- 15  A8     "DD/MM/YY" Date      Observation date
  18- 31  F14.6     d       JD        Julian day
  34- 35  I2        h       RAh       Right ascension J2000.0
  37- 38  I2        min     RAm       Right ascension J2000.0
  40- 45  F6.3      s       RAs       Right ascension J2000.0
      47  A1        ---     DE-       Declination sign
      48  I1        deg     DEd       Declination J2000.0
  50- 51  I2        arcmin  DEm       Declination J2000.0
  53- 57  F5.2      arcsec  DEs       Declination J2000.0
  60- 64  F5.3      s       DRA       Residuals (O-C) in RA
  66- 70  F5.2      arcsec  DDE       Residuals (O-C) in DE
  73- 75  A3        ---     Obs       Abbreviations of observer names (1)

Note (1): Observers with the Baldone Schmidt telescope:
           Al. - A.Alksnis,  Eg. - I.Eglitis, Jr. - I.Jurgitis,
           Pu. - I.Pundure,  St. - J.I.Straume.

(End)                                         Patricia Bauer [CDS]   01-Apr-1996