Precise positions of Phoebe determined with CCD image-overlapping calibration

Abstract

This paper presents 210 positions of Phoebe, the ninth satellite of Saturn, observed with the 1-m telescope at the Yunnan Observatory during the years 2003-2005, using a CCD imageoverlapping calibration method proposed recently by Peng et al. After the observed positions of Phoebe are compared with its theoretical positions computed by the new JPL ephemerides DE405 and SAT199, the mean residuals (observed minus computed) are 0.21 and -0.05 arcsec in right ascension and declination, respectively, with a standard deviation of 0.06 arcsec.