✦ LIBER ✦

Resonant forcing of Mercury's libration in longitude

✍ Scribed by S.J. Peale; J.L. Margot; M. Yseboodt

Publisher: Elsevier Science
Year: 2009
Tongue: English
Weight: 453 KB
Volume: 199
Category: Article
ISSN: 0019-1035
DOI: 10.1016/j.icarus.2008.09.002

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✦ Synopsis

The period of free libration of Mercury's longitude about the position it would have had if it were rotating uniformly at 1.5 times its orbital mean motion is close to resonance with Jupiter's orbital period. The Jupiter perturbations of Mercury's orbit thereby lead to amplitudes of libration at the 11.86 year period that may exceed the amplitude of the 88 day forced libration determined by radar. Mercury's libration in longitude may be thus dominated by only two periods of 88 days and 11.86 years, where other periods from the planetary perturbations of the orbit have much smaller amplitudes.

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