Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002acasn..43...84p&link_type=abstract
Acta Astronomica Sinica, vol.43, no.1, p. 84-89
Astronomy and Astrophysics
Astronomy
Natural Satellite, Reference System, Astrometry
Scientific paper
CCD images for two Galilean satellites: Europa, Callisto and a bright star in Hipparcos Catalogue (No.104297) are obtained on 1 meter telescope at the Yunnan Observatory on the night of Nov.14, 1997. After the two satellites were measured for the scale and orientation of CCD frames, the apparent positions for the star were determined with respect to Callisto. The theoretical positions for Europa and Callisto were calculated from JPL DE405 and Sampson-Lieske theory (G5). The mean differences for the star in R.A. and Dec. between observed apparent positions and calculated ones from Hipparcos Catalogue are 0.''029+/-0.''012 and 0.''005+/-0.''011, respectively (at the mean epoch: 1997 Nov.14, 13h43m50s(UT). The result is in a good agreement with that from Casas et al. Furthermore, it also means a good agreement between the dynamical reference system from DE405 and the optical one from the Hipparcos Catalogue at the observational epoch. Our standard errors for a single observation are 0.''052 and 0.''047 in R.A. and Dec., respectively. These are as good as the most accurate observation for Galilean satellite.
Li Zhao-Liang
Peng Qi-Yong
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