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Evolution of the Janus-Epimetheus Coorbital Resonance Due to Torques from Saturn's Rings

Lissauer, Jack J. and Goldreich, Peter and Tremaine, Scott (1985) Evolution of the Janus-Epimetheus Coorbital Resonance Due to Torques from Saturn's Rings. Icarus, 64 (3). pp. 425-434. ISSN 0019-1035. http://resolver.caltech.edu/CaltechAUTHORS:20130301-102826680

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Abstract

We analyze the interactions between Saturn's coorbital satellites, Janus and Epimetheus, and the outer edge of the A ring, which is presumably maintained by these moons at their 7:6 resonance. Using two distinct but conceptually related methods, we show that ring torques are driving these satellites into a tighter lock. Unless there is a counterbalancing force which we have neglected, their orbital configuration will evolve from the current horseshoe-type lock to one of tadpole orbits around a single Lagrange point in ∼20 myr. This finding adds an additional member to the list of short time scale problems associated with the interactions between Saturn's rings and its inner moons


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/0019-1035(85)90066-1DOIUNSPECIFIED
http://www.sciencedirect.com/science/article/pii/0019103585900661PublisherUNSPECIFIED
Additional Information:© 1985 Academic Press Inc. Received April 29, 1985; revised August 19, 1985. We are grateful to Nicole Borderies for her assistance in the early phases of this research. Useful data and comments were also provided by J. Cuzzi, L. Dones, S. Peale, F. Shu, S. Synnott, and C. Yoder. JJL was supported by an NAS-NRC resident research associateship at NASA-Ames and NASA consortium Grant NCA2-1R050-501 at UC Berkeley. PG acknowledges support from NASA Grant NGL-05-002-003 and NSF Grant AST-8313725. ST acknowledges support from NSF Grant AST-8412365.
Funders:
Funding AgencyGrant Number
NAS-NRC resident research associateshipUNSPECIFIED
NASA consortiumNCA2-1R050-501
NASANGL-05-002-003
NSFAST-8313725
NSFAST-8412365
Record Number:CaltechAUTHORS:20130301-102826680
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20130301-102826680
Official Citation:Jack J. Lissauer, Peter Goldreich, Scott Tremaine, Evolution of the Janus-Epimetheus coorbital resonance due to torques from Saturn's ring, Icarus, Volume 64, Issue 3, December 1985, Pages 425-434, ISSN 0019-1035, 10.1016/0019-1035(85)90066-1. (http://www.sciencedirect.com/science/article/pii/0019103585900661)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37235
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:01 Mar 2013 18:46
Last Modified:01 Mar 2013 18:46

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