A Note on the Instantaneous Rotational Velocity of Mercury

Details A Note on the Instantaneous Rotational Velocity of Mercury A Note on the Instantaneous Rotational Velocity of Mercury

Mar 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970cemec...2..123l&link_type=abstract

Celestial Mechanics, Volume 2, Issue 1, pp.123-126

Physics

1

Scientific paper

The fluctuation in the angular velocity of the present rotation of Mercury is investigated. The instantaneous rotational rate in terms of orbital mean motion at different positions along Mercury's orbit is given. At aphelion the rotational velocity decreases substantially because the solar gravitational torque on the two thermal bulges on Mercury's surface tends to retard the rotation of Mercury before aphelion passage. It is found that the difference between the rotational periods derived from the motions at perihelion and aphelion is 4.68 min and that the maximum rate of rotation occurs atf=π/4 andf=7π/4, wheref is the true anomaly.

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