An accurate theory of Mercury's rotation and centrifugal librations

Details An accurate theory of Mercury's rotation and centrifugal librations An accurate theory of Mercury's rotation and centrifugal librations

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sf2a.conf...79r&link_type=abstract

SF2A-2005: Semaine de l'Astrophysique Francaise, meeting held in Strasbourg, France, June 27 - July 1, 2005, Edited by F. Casoli

Astronomy and Astrophysics

Astrophysics

Scientific paper

The internal structure of Mercury is the most puzzling among the terrestrial planets. MESSENGER and the upcoming Bepi-Colombo space missions as well as ground-based radar measurements will play an important role in furthering our understanding of the structure, formation, and evolution of Mercury. A complete theory of the coupled spin-orbit motion of Mercury within the Solar System is an essential complement to observational data and will improve significantly our knowledge of the planet. Here, core-mantle interactions are studied in a realistic model of the orbital and rotational motions of Mercury. We use the SONYR model of the Solar System including Mercury's spin-orbit motion (SONYR is the acronym of Spin-Orbit N-bodY Relativistic model) and investigate the dynamical behavior of the rotational motion of Mercury considered as a solid body including either a solid core or a liquid core. The liquid core and the solid mantle are assumed to be coupled through an inertial torque on the ellipsoidal core-mantle boundary. We determine Mercury's rotation for a large set of interior structure models of Mercury in order to identify and to clarify the impact of core motions on the librations.

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