CaltechAUTHORS
  A Caltech Library Service

The Uranus Occultation of 10 June 1979. I. The Rings

Nicholson, P. D. and Matthews, K. and Goldreich, P. (1981) The Uranus Occultation of 10 June 1979. I. The Rings. Astronomical Journal, 86 (4). pp. 596-606. ISSN 0004-6256. https://resolver.caltech.edu/CaltechAUTHORS:20130306-154922514

[img]
Preview
PDF - Published Version
See Usage Policy.

1335Kb

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20130306-154922514

Abstract

Observations and analysis of a stellar occultation by the rings of Uranus on 10 June 1979 are presented. Occultations by rings 4, ɑ, β, y, δ, and є are identified, and radii and azimuths of the occulting segments in the plane of the rings calculated. Results for rings y and δ are consistent with the hypothesis (Elliot et al. 1978; Nicholson et ɑl. 1978) that these two rings are circular and coplanar, and an approximate upper limit of 8 X 10^(-5) is placed on the eccentricity of either ring. Coplanar elliptical models are presented for rings ɑ and β, with eccentricities of (6.0±0.3) x 10^(-4) and (4.9±0.5) x 10^(-4), respectively. For ring 4 two possible elliptical models are obtained, with eccentricities of (1.2±0.4) x 10^(-3) and (6.0±0.3) x 10^(-4), the former being preferred. The width-radius relation established previously for the є ring is confirmed, and the elliptical model for this ring is slightly revised. An improved estimate for Uranus's J_2 of (3.390 ± 0.005) x 10^(-3), based on the apsidal precession of the є ring, and an upper limit for │J_4│ of ~1 x 10^(-4), based on the precession of rings 4 and β, are obtained.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1086/112921DOIArticle
http://adsabs.harvard.edu/abs/1981AJ.....86..596NADSArticle
ORCID:
AuthorORCID
Nicholson, P. D.0000-0003-2275-4463
Additional Information:© 1981 American Astronomical Society. Received 2 October 1980. The authors gratefully acknowledge the assistance of F. Peralta, W. Robinson, L. Papic, and J. Mould in making the observations at Las Campanas. J. L. Elliot kindly provided a preprint concerning the 20 March 1980 occultation. This work was supported in part by NASA.
Funders:
Funding AgencyGrant Number
NASAUNSPECIFIED
Subject Keywords:URANUS, RINGS, OCCULTATIONS, OBSERVATIONS, DATA, RADIUS, AZIMUTH, SHAPE, ECCENTRICITY, MODELS, GEOMETRY, PARAMETERS, HYPOTHESES, ELLIPTICITY, GRAVITATIONAL MOMENTS, COMPARISONS, PRECESSION, WIDTH
Issue or Number:4
Record Number:CaltechAUTHORS:20130306-154922514
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130306-154922514
Official Citation:The Uranus occultation of 10 June 1979. I. The rings Nicholson, P. D.; Matthews, K.; Goldreich, P. Astronomical Journal, vol. 86, Apr. 1981, p. 596-606.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37361
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:08 Mar 2013 22:14
Last Modified:11 Mar 2020 23:10

Repository Staff Only: item control page