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Title:
Occultation detection of a Neptunian ring-like arc
Authors:
HUBBARD, W. B.; BRAHIC, A.; SICARDY, B.; ROQUES, F.; ELICER, L. -R.; VILAS, F.
Affiliation:
AA(Arizona, University, Tucson) AD(Paris, Observatoire, Meudon, France) AE(Observatorio Interamericano de Cerro Tololo, La Serena, Chile) AF(NASA, Johnson Space Center, Houston, TX; Arizona, University, Tucson)
Journal:
Nature (ISSN 0028-0836), vol. 319, Feb. 20, 1986, p. 636-640. Research supported by the European Southern Observatory, Universite de Paris VII, Observatoire de Paris, Institut National d'Astronomie et de Geophysique, FNRS and CNRS.
Publication Date:
02/1986
Category:
Astronomy
Origin:
STI
NASA/STI Keywords
NEPTUNE (PLANET), PLANETARY RINGS, STELLAR OCCULTATION, ASTROMETRY, IMAGING TECHNIQUES, SPACE OBSERVATIONS (FROM EARTH)
Bibliographic Code:
1986Natur.319..636H

Abstract

The apparent closest approach of the star SAO186001 to Neptune was observed photoelectrically on July 22, 1984 at Cerro Tololo Inter-American Observatory. A 32-percent signal drop, lasting about 1.2 s, was probably caused by a partially transparent arc of material at a distance of 67,000 km from Neptune. Neptune's arc(s) do not vary smoothly with azimuth, unlike the rings of other Jovian planets. 
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