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VI/31       Plate Centers, Epochs Lick/Mt. John Sky Survey (Lick Obs. 1965)
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Plate Centers and Epochs of the Lick Observatory/Mount John Observatory Sky
Survey
    Lick Observatory
    < (1965) >
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ADC_Keywords: Surveys; Plate data

Description:
  The "Lick Observatory Sky Atlas" (Lick Observatory, 1965) is a set
  of plates for 166 fields of 18 by 18 degrees, covering the sky from
  the north pole down to -30 degrees of declination. "The Mount John
  University Observatory Photographic Sky Survey" (Doughty et al.,
  1972) covers 142 similar fields from -15 degrees of declination down
  to the south pole.  In the region of overlap, the fields are the
  same for the two surveys.  Fields 1-46 of the Mount John survey
  cover the part of the sky (-45 degrees of declination to the south
  pole) not in the Lick survey; in a special limited edition published
  in 1972, this part is called the "Canterbury Sky Atlas" (Australia).
  The overlap between fields is 3 degrees. The plate scale is
  approximately 232 arc seconds per millimeter. The limiting magnitude
  is approximately 16. Neither survey is intended for astrometry or
  photometry; the Lick survey was originally done to obtain galaxy
  statistics (Shane and Wirtanen 1967). An excellent summary of
  several photographic sky surveys is given by Ingrao and Kasparian
  (1967). T. A. Nagy (1980) generated the dataset described, and also
  gathered most of the material used in the writing of this document. 

File Summary:
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 FileName     Lrecl  Records   Explanations
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ReadMe           80        .   This file
data.dat         80      212   Data
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Byte-by-byte Description of file: data.dat
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   Bytes  Format   Units   Label     Explanations
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   8- 10   I3      ---     Fnum     *? Field number  
  14- 16   I3      ---     Fnum2     Field number 2
  18- 21   I4      ---     CSInum    ? The number of CSI stars in the field
  24- 33   F10.8   rad     RArad     Right ascension of the field center,
                                     equinox 1950, in radians.
  37- 47   F11.8   rad     DErad     Declination of the field center,
                                     equinox 1950, in radians.
  53- 61   F9.4    yr      Epoch    *Epoch of the plate
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Note on Fnum:
  There are 212 fields, and one record in this file for each field. The south
  pole is number 1, and the north pole is number 212. The other fields are
  arranged in fifteen-degree declination bands; within each band, the fields
  are numbered with increasing right ascension. The records in this file are
  in ascending order of field number. 

Note on Epoch:
  Epoch of the plate,  given as a year with a decimal fraction.  This fraction
  is the length of time from January 0.0 UT to the exposure date, given as a
  fraction of the tropical year of 365.2422 mean solar days. For fields in
  common between the two surveys (nos. 47-142), the Mount John epoch is
  used. 

References:
 Doughty, N. A., Shane, C. D., and Wood, F. B. 1972, The Mount John University
    Photographic Sky Survey and the Canterbury Sky Atlas (Australia)
    (Christchurch, New Zealand:  University of Canterbury).
 Ingrao, H. C., and Kasparian, E. 1967, Sky and Telescope (November), p. 284.
 Lick Observatory Sky Atlas, 1965 (Mount Hamilton, California: Lick Observatory)
 Nagy, T. A. 1980, Astron. Data Center Bull. 1, 28.
 Shane, C. D. 1958, Publ. Astron. Pacific 7O, 609.
 Shane, C. D., and Wirtanen, C. A. 1967, The Distribution of Galaxies (Lick Obs.
    Publications, XXII Part I).
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(End)                        C.-H. Joseph Lyu [Hughes STX/NASA]  16-Aug-1995