The Uranus occultation of 10 June 1979. I - The rings

Details The Uranus occultation of 10 June 1979. I - The rings The Uranus occultation of 10 June 1979. I - The rings

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981aj.....86..596n&link_type=abstract

Astronomical Journal, vol. 86, Apr. 1981, p. 596-606. NASA-supported research.

Astronomy and Astrophysics

Astronomy

17

Astronomical Models, Planetary Gravitation, Stellar Occultation, Uranus Rings, Concentricity, Eccentricity, Ellipticity, Gravitational Effects, Infrared Spectrophotometers, Signal To Noise Ratios, Uranus, Rings, Occultations, Observations, Data, Radius, Azimuth, Shape, Eccentricity, Models, Geometry, Parameters, Hypotheses, Ellipticity, Gravitational Moments, Comparisons, Precession, Width

Scientific paper

Observations and analysis of a stellar occultation by the rings of Uranus on 10 June 1979 are presented. Occultations by rings 4, α, β, γ, δ, and ɛ are identified, and radii and azimuths of the occulting segments in the plane of the rings calculated. Results for rings γ and δ are consistent with the hypothesis (Elliot et al. 1978; Nicholson et al. 1978) that these two rings are circular and coplanar, and an approximate upper limit of 8 × 10-5 is placed on the eccentricity of either ring. Coplanar elliptical models are presented for rings α and β with eccentricities of (6.0±0.3) × l0-4 and (4.9±0.5) × 10-4, respectively. For ring 4 two possible elliptical models are obtained, with eccentricities of (1.2±0.4) × 10-3 and (6.0±0.3) × 10-4, the former being preferred. The width-radius relation established previously for the E ring is confirmed, and the elliptical model for this ring is slightly revised. An improved estimate for Uranus's J2 of (3.390±0.005) × l0-4, based on the apsidal precession of the ɛ ring, and an upper limit for |J4| of ˜1 × 10-4, based on the precession of rings 4 and β are obtained.

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