Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-10-23
Astronomy and Astrophysics
Astrophysics
8 pages, 3 figures, 1 table, To appear in A&A, for comments : charnoz@discovery.saclay.cea.fr
Scientific paper
10.1051/0004-6361:20000183
Observations of the November 1995 Sun crossing of the Saturn's ring-plane made with the 3.6m CFH telescope, using the UHAO adaptive optics system, are presented here. We report the detection of four arcs located in the vicinity of the F ring. They can be seen one day later in HST images. The combination of both data sets gives accurate determinations of their orbits. Semi-major axes range from 140020 km to 140080 km, with a mean of 140060 +- 60 km. This is about 150 km smaller than previous estimates of the F ring radius from Voyager 1 and 2 data, but close to the orbit of another arc observed at the same epoch in HST images.
Brahic Andre
Charnoz Sebastien
Ferrari Cecile
Grenier Isabelle
Roddier Francois
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