Contents. planet: 6 - Saturn satellites: S9-Phoebe : 7 (1995-1995 : 6, 1997-1997 : 1 ) total number: 7 type: absolute dates: 1995-1997 observatory: 950 - La Palma Reference. Observations communicated to NSDC by : Derek Jones Institute of Astronomy Madingley Road, Cambridge CB3 0HA United Kingdom Work: +44 (0)1223 766661 Fax: +44 (0)1223 337523 Home: +44 (0)1954 210314 email: dhpj@ast.cam.ac.uk Informations. relative to: absolute reference frame: astrometric centre of frame: topocentre epoch of equinox: J2000 time scale: UTC reduction: DSS-II, USNO ACT coordinates: absolute diff. refraction: no information receptor: CCD telescope: Jacobus Kapteyn Telescope, D = 1 m. observers: Harper D., Beurle K. data included in standard data file: no Comments. 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. 1. Julian date in MJD (JD - 2400000.5) UTC 2. Hour of right ascension (alpha, h) 3. Minute of right ascension (alpha, m) 4. Second of right ascension (alpha, s) 5. Degree of declination (delta, deg) 6. Minute of declination (delta, ' ) 7. Second of declination (delta, '' ) 8. The residuals in right ascension (arcsec) from the JPL Horizons ephemeris 9. The residuals in declination (arcsec) from the JPL Horizons ephemeris 10. The number of CCD exposures (n). -------------------------------------------------------------- Date in MJD alpha delta residuals(arcsec) h m s deg ' '' alpha delta n --------------------------------------------------------------