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File: 1995_S9_jones_nsdc.data.txt
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       Contents:
   - 7 observations of S-9 Phoebe made from 1995 Aug. 31 to 1997 Oct. 22

       References:
  Observations communicated to NSDC by :
   |    Derek Jones                  |  Work: +44 (0)1223 766661    |
   |    Institute of Astronomy       |  Fax:  +44 (0)1223 337523    |
   |    Madingley Road,              |  Home: +44 (0)1954 210314    |
   |    Cambridge CB3 0HA            |  email: dhpj@ast.cam.ac.uk   |
   |    United Kingdom               |                              |

       Comments:
    The observations were taken by David Harper and Kevin Beurle with the
 1-metre Jacobus Kapteyn Telescope on La Palma.   The pixels were 0.33
 arcsec and the CCD chip size 330 arcsec on the side.  A red (R) filter
 was used and the exposure was 64 sec.   It is straightforward to measure
 the position of Phoebe and about ten reference stars on each exposure.
 The positions of the reference stars were measured on the Digital Sky
 Survey (DSS-II with 1 arcsec pixels) together with about ten stars from
 the USNO ACT catalogue, all within 0.7 degrees of the CCD fields.   The
 goodness of fit was 0.12 arcsec, rms in one co-ordinate.
    The goodness of fit of the reference stars to the positions measured
 on the CCD was smaller.  Phoebe was measured relative to the same
 reference stars within each night but relative to a different set of
 reference stars on different nights.   The scatter of the residuals
 relative to the JPL Horizons ephemeris within nights was much smaller
 than from night to night.   This indicates that the accuracy is simply
 the accuracy of the star positions, i.e. 0.12 arcsec.
    The observations have been combined into one normal place for each
 of the seven nights with an rms scatter of 0.04 arcsec within nights.

     Format:
The data are: 
       julian date in MJD (JD - 2400000.5) UTC  F14.5
       hours      R.A. J2000                    I3
       minutes    "                             I3
       seconds    "                             F7.3
       degrees    Declination J2000             I5
       minutes    "                             I3
       seconds    "                             F6.2
                                                4X
       Obs                                      F3.2
       Hor                                      F5.2
       n                                        I6

 `Obs - Hor' are the residuals in arcsec from the JPL Horizons ephemeris.
 `n' is the number of CCD exposures.
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