Physics
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.277...97g&link_type=abstract
Nature, vol. 277, Jan. 11, 1979, p. 97-99.
Physics
85
Particle Collisions, Planetary Evolution, Uranus Rings, Ellipses, Natural Satellites, Planetary Gravitation, Precession, Radial Distribution, Radiation Distribution, Ring Structures, Torque
Scientific paper
Interparticle collisions, radiation drag, and differential precession all tend to disrupt the rings of Uranus. The first two effects lead to radial spreading which would disrupt a free ring in less than or approximately 100,000,000 yr. It is proposed that the rings are confined in radius by gravitational torques from a series of small satellites that orbit with the ring system. Differential precession tends to destroy the apse alignment of the elliptical epsilon ring. It is suggested that apse alignment is maintained by the self-gravity of the ring. The resulting mass of the epsilon ring is approximately 5 times 10 to the 18th power g. Its radial confinement requires (for example) a pair of satellites of mass approximately 10 to the 19th power g, in circular orbits roughly 500 km away on either side of the ring
Goldreich Peter
Tremaine Scott
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