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, M. J. Northcott

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32 Scopus citations


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 discovered by stellar occultations in 1984, they appear to have persisted, perhaps through a gravitational resonance effect involving the satellite Galatea. 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 paper), indicate that the ring arcs are near, but not within the resonance with Galatea, in contrast to what is predicted by some models.

Original languageEnglish (US)
Pages (from-to)731-733
Number of pages3
Issue number6746
StatePublished - Aug 19 1999
Externally publishedYes


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Cite this

Sicardy, B., Roddier, F., Roddier, C., Perozzi, E., Graves, J. E., Guyon, O., & Northcott, M. J. (1999). Images of Neptune's ring arcs obtained by a ground-based telescope. Nature, 400(6746), 731-733.