Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dda....38.1310m&link_type=abstract
American Astronomical Society, DDA meeting #38, #13.10
Astronomy and Astrophysics
Astronomy
Scientific paper
The tidal evolution through several resonances involving Enceladus is studied numerically with an averaged resonance model. We find, in the 2:1 Enceladus-Dione e-Enceladus type resonance, Enceladus evolves chaotically in the future for some values of k2/Q. We find that the current anomalously large eccentricity of Mimas can be explained by passage through the 3:2 Mimas-Enceladus resonance. In both cases, escape from the resonance occurs by unstable growth of the libration angle. Explanation of the current eccentricity of Mimas through this mechanism implies that the Q of Saturn is below 70,000. Though the eccentricity of Enceladus can be excited to moderate values by capture in the 3:2 Mimas-Enceladus e-Enceladus resonance, the libration amplitude damps and the system does not escape. Thus past occupancy of this resonance and consequent tidal heating of Enceladus is excluded.
Meyer Jennifer
Wisdom Jeffrey
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