35th Meeting of the AAS Division on Dynamical Astronomy, April 2004
Session 5 Planets
Oral, Thursday, April 22, 2004, 9:30am-12:45pm,

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[5.04] Long Term Evolution of the Terrestrial Planets' Spin Axes

J. Laskar (Observatoire de Paris)

The long term evolution of the spin axis of the terrestrial planets strongly depends on the gravitational perturbations from all the planets of the Solar System that create a large chaotic zone for their obliquity. Over the age of the Solar System, it is also necessary to take into account various dissipative effects that are usually not very well known (body and atmospheric tides, core-mantle friction), and that can change in a large amount the spin rate and orientation of the planet. In this talk, I will review the recent studies that we conducted on all Terrestrial planets (Mercury, Venus, Earth, and Mars), in order to better understand their spin evolution over the age of the Solar System.

Acknowledgement: This study benefited from support from PNP-CNRS, IDRIS-CNRS, and CS, Paris Observatory.

The author(s) of this abstract have provided an email address for comments about the abstract: laskar@imcce.fr

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Bulletin of the American Astronomical Society, 36 #2
© 2004. The American Astronomical Soceity.