The influence of orbital dynamics, shape and tides on the obliquity of Mercury
作者： Benoît Noyelles , Christoph Lhotka
DOI: 10.1016/J.ASR.2013.09.024
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摘要: Abstract Earth-based radar observations of the rotational dynamics Mercury (Margot et al., 2012) combined with determination its gravity field by MESSENGER (Smith give clues on internal structure Mercury, in particular polar moment inertia C , deduced from obliquity ( 2.04 ± 0.08 ) arcmin. The is a very-long term motion (a few hundreds kyrs), based regressional Mercury’s orbital ascending node. This paper, following study Noyelles and D’Hoedt (2012), aims at first giving initial conditions any time for values parameters numerical simulations, using them to estimate influence usually neglected obliquity, like J 3 Love number k 2 secular variations elements. We use, that, averaged representations motions suitable long-term studies. find that should alter 250 milli-arcsec, tides 30 milli-arcsec, elements 10 milli-arcsec over 20 years. resulting value could be most changed 0.346 mR 0.345 .
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