CCD observations of planetary satellites at the U.S. Naval Observatory.

Astronomy and Astrophysics – Astronomy

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Planetary Satellites: Astrometry, Planetary Satellites: Ccd Observations

Scientific paper

A program of astrometric CCD observations of faint satellites of the planets was initiated at the U.S. Naval Observatory (USNO) to complement their photographic program for the bright satellites (Pascu 1979, Pascu et al. 1983). The program emphasizes the faint inner satellites for which the CCD is better adapted. Included in this group are Amalthea (JV), Thebe (JXIV), Helene (SXII), Telesto (SXIII), Calypso (SXIV), Miranda (UV), and Nereid (NII). Almost all of the faint outer satellites are also being observed with a CCD. In addition, an experimental program for high precision observations of the Galilean satellites was begun two years ago in support of the GALILEO Project. At present, 25 satellites cannot be observed from the ground at all, or with great difficulty. Of these, about 15 can be detected with the CCDs in the Wide Field Planetary Camera II of the Hubble Space Telescope. The USNO participates on a team which is analyzing HST astrometric observations of the inner Uranian system and is making plans to obtain similar observations of the inner Neptunian system.

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