Other
Scientific paper
Oct 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977lastr..91..405b&link_type=abstract
L'Astronomie, vol. 91, Oct. 1977, p. 405-412. In French.
Other
Ring Structures, Stellar Occultation, Uranus (Planet), Astronomical Models, Astronomical Observatories, Astronomical Photometry, Planetary Evolution, Planetary Structure, Saturn Rings
Scientific paper
The occultation of a star by the passage of Uranus March 10, 1977 led to the discovery of a ring around Uranus. It is possible that the ring is composed of five bands. By studying the extent to which a star's light is diminished just before and just after an occultation, information on the planet's atmosphere can be deduced. In this occultation, light was interrupted by secondary occultations in the intervals between 42,000 and 55,000 km from the center of Uranus. The pattern of radial distances for the four inner bands was found to be almost the same in pre-immersion and post-emersion occultation observations; the fifth band, which blocked light for 4-9 seconds, a longer time than did the inner bands, showed a slightly asymmetric pattern which might indicate an elliptical orbit. Two theories of ring structure are considered - one, that the bands are composed of small objects separated from each other, and two, that the bands are solid. The ring of Uranus is thought to differ in some ways from Saturn's rings.
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