Five stellar occultations by Neptune - Further observations of ring arcs

Details Five stellar occultations by Neptune - Further observations of ring arcs Five stellar occultations by Neptune - Further observations of ring arcs

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990icar...87....1n&link_type=abstract

Icarus (ISSN 0019-1035), vol. 87, Sept. 1990, p. 1-39.

Astronomy and Astrophysics

Astronomy

22

Light Curve, Neptune (Planet), Planetary Rings, Stellar Occultation, Astrometry, Optical Thickness, Voyager 2 Spacecraft

Scientific paper

Diffraction model fits to the light curves obtained during April 18, 1984 and August 20, 1985 stellar occultations that revealed incomplete rings, or 'arcs' around Neptune, are found to indicate arc radial widths of 8-26 km, and normal optical depths of 0.07-0.14. On the basis of the Neptune pole direction ascertained from Voyager navigation analyses, it is confirmed that the arc observed on August 20, 1985, together with the Hubbard et al. (1986) and Covault et al. (1986) arcs, seem to match the radius of the outermost ring found in Voyager images analyzed by Smith et al. (1989).

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