Images of Neptune's ring arcs obtained by a ground-based telescope

B. Sicardy (), F. Roddier, C. Roddier, E. Perozzi, J. E. Graves, O. Guyon and M. J. Northcott
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B. Sicardy: Observatoire de Paris, Institut Universitaire de France, DESPA
F. Roddier: Institute for Astronomy, University of Hawaii
C. Roddier: Institute for Astronomy, University of Hawaii
E. Perozzi: Observatoire de Paris, Institut Universitaire de France, DESPA
J. E. Graves: Institute for Astronomy, University of Hawaii
O. Guyon: Institute for Astronomy, University of Hawaii
M. J. Northcott: Institute for Astronomy, University of Hawaii

Nature, 1999, vol. 400, issue 6746, 731-733

Abstract: Abstract Neptune has a collection of incomplete narrow rings, known as ring arcs, which should in isolation be destroyed by differential motion in a matter of months. Yet since first discovered1 by stellar occultations in 1984, they appear to have persisted2,3,4,5,6, perhaps through a gravitational resonance effect involving the satellite Galatea6,7,8. Here we report ground-based observations of the ring arcs, obtained using an adaptive optics system. Our data, and those obtained using the Hubble Space Telescope (reported in a companion paper9), indicate that the ring arcs are near, but not within the resonance with Galatea, in contrast to what is predicted by some models.

Date: 1999
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DOI: 10.1038/23410

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