Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p53b1511c&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #P53B-1511
Physics
[5450] Planetary Sciences: Solid Surface Planets / Orbital And Rotational Dynamics, [6295] Planetary Sciences: Solar System Objects / Venus
Scientific paper
Although Venus and the Earth are the most similar planets in the Solar system, the rotation of these two planets has quite different characteristics. Of the very slow retrograde rotation of Venus, due to a balance between atmospheric and solid body tidal torques, emerge many differences on the evolution of the rotational state of Venus with respect to the Earth one. A complete study of the rotation of Venus on short time scale is presented and compared to the results obtained for the Earth. Applying the theoretical models of Kinoshita (1972, 1977) already used for the Earth, the polhody and the nutation of the figure axis of a rigid Venus is determined. Then evaluating the deformations produced by the zonal part of the tidal potential on the principal moment of inertia, the periodic variations of the speed of rotation of Venus is presented. At last the differences between the results obtained for Venus and for the Earth are explained. Preliminary results on the effect of the atmosphere and the interior of the planet on its rotation state will also be discussed.
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