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Record Details

Record 9 of 22136
Towards a theory for Neptune's arc rings
External Online Source: doi:10.1086/114178
Author and Affiliation:
Goldreich, P.(California Institute of Technology, Pasadena, United States)
Tremaine, S.(Toronto, University, Canada)
Borderies, N.(Pic-du-Midi et Toulouse, Observatoires, Toulouse, France)
Abstract: It is proposed that the incomplete rings of Neptune consist of a number of short arcs centered on the corotation resonances of a single satellite. The satellite must have a radius of the order of 100 km or more and move on an inclined orbit. Corotation resonances are located at potential maxima. Thus, mechanical energy dissipated by interparticle collisions must be continually replenished to prevent the arcs from spreading. It is shown that each corotation resonance is associated with a nearby Lindblad resonance, which excites the ring particles' orbital eccentricity, thus supplying the energy required to maintain the arc. The ultimate energy reservoir is the satellite's orbital energy. Therefore, interaction with the arcs damps the satellite's orbital inclination. The self-gravity of the arcs limits their contraction and enforces a relation between arc length and mass. The estimated arc masses are so small, of the order of 10 to the 16th g, that the satellite's orbital inclination suffers negligible decay over the age of the solar system. The inferred surface mass densities are comparable to those found in the major rings of Saturn and Uranus.
Publication Date: Aug 01, 1986
Document ID:
19860064684
(Acquired Nov 28, 1995)
Accession Number: 86A49422
Subject Category: LUNAR AND PLANETARY EXPLORATION
Document Type: Journal Article
Publication Information: Astronomical Journal (ISSN 0004-6256); 92; 490-494
Publisher Information: United States
Contract/Grant/Task Num: NSF AST-84-12365; NSF AST-85-21033; NGL-05-002-003
Financial Sponsor: NASA; United States
Organization Source: California Inst. of Tech.; Pasadena, CA, United States
Toronto Univ. Ontario; Cambridge, MA, United States
Massachusetts Inst. of Tech.; Bagneres de Bigorre, France
Observatoire du Pic-du-Midi
Description: 5p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: CELESTIAL MECHANICS; NATURAL SATELLITES; NEPTUNE ATMOSPHERE; PERTURBATION THEORY; PLANETARY RINGS; ARCS; ECCENTRIC ORBITS; ENERGY DISSIPATION; MASS DISTRIBUTION; ORBITAL ELEMENTS; PARTICLE COLLISIONS
Imprint And Other Notes: Astronomical Journal (ISSN 0004-6256), vol. 92, Aug. 1986, p. 490-494. CNRS-supported research.
Miscellaneous Notes: CNRS-supported research
Availability Source: Other Sources
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