EDP Sciences
Free access
Volume 416, Number 2, March III 2004
Page(s) 799 - 800
Section Celestial mechanics and astrometry
DOI http://dx.doi.org/10.1051/0004-6361:20035710

A&A 416, 799-800 (2004)
DOI: 10.1051/0004-6361:20035710

A comment on "Accurate spin axes and solar system dynamics: Climatic variations for the Earth and Mars"

J. Laskar

Astronomie et Systèmes Dynamiques, IMCCE-CNRS UMR 8028, 77 Av. Denfert-Rochereau, 75014 Paris, France
(Received 19 November 2003 / Accepted 26 November 2003)

In a recent paper, Edvardsson et al. (2002) propose a new solution for the spin evolution of the Earth and Mars. Their results differ significantly with respect to previous studies, as they found a large contribution on the precession of the planet axis from the tidal effects of Phobos and Deimos. In fact, this probably results from the omission by the authors of the torques exerted on the satellites orbits by the planet's equatorial bulge, as otherwise the average torque exerted by the satellites on the planet is null.

Key words: celestial mechanics -- ephemerides -- planets and satellites: individual: Mars -- Earth

© ESO 2004