Evolution of the Spin of Mercury and its Capture Into the 3/2 Spin-Orbit Resonance

Details Evolution of the Spin of Mercury and its Capture Into the 3/2 Spin-Orbit Resonance Evolution of the Spin of Mercury and its Capture Into the 3/2 Spin-Orbit Resonance

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006pmpa.conf....1c&link_type=abstract

2005: PAST MEETS PRESENT IN ASTRONOMY AND ASTROPHYSICS. Proceedings of the 15th Portuguese National Meeting. Held 28-30 July 200

Astronomy and Astrophysics

Astrophysics

Scientific paper

The present spin of Mercury is very peculiar and was only discovered in 1965: the planet spins three times around its axis exactly in the same time as it completes two orbital revolutions1. The way the planet evolved into this configuration remained a mystery until very recently2. In order to understand this phenomena we must take into account the planetary perturbations over Mercury's orbit, that continuously change its eccentricity. As a result, for any initial rotation rate it was found that the chances of capture in the present configuration rise to about 55.4%.

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