Rotation of the Planet Mercury

  title={Rotation of the Planet Mercury},
  author={Stanton J. Peale and Thomas Gold},
SOLAR tidal friction must be an intense effect for Mercury, and it must be expected that the planet's spin would have relaxed from any original value to one that is under the control of this effect in a time short compared with the age of the solar system. The retarding torque exerted by the Sun on a planet is proportional to 1/r6 (where r is the distance Sun-planet), a factor which is some 300 times greater for Mercury than for the Earth. For a planet on a circular orbit the final condition… Expand
Rotational Period of the Planet Mercury
IN a recent communication by S. J. Peale and T. Gold1 the rotational period of Mercury, determined from radar Doppler-spread measurements to be 59 ± 5 days2, has been explained in terms of a solarExpand
On the rotation of Mercury
A planar, fixed-orbit model of the rotation of the planet Mercury is analyzed. The model includes only the solar torques on the planet's permanent asymmetry and its solar tidal bulge. For this model,Expand
Tidal De-spin of Planets and Satellites
RECENTLY, Peale and Gold1 have shown that the non-synchronous rotation of Mercury is likely to be a consequence of tidal friction. They point out that in an eccentric orbit the spin of an axiallyExpand
Mercury: the planet and its orbit
The planet closest to the Sun, Mercury, is the subject of renewed attention among planetary scientists, as two major space missions will visit it within the next decade. These will be the first toExpand
Q in the solar system
Abstract Secular changes brought about by tidal friction in the solar system are reviewed. The presence or absence of specific changes is used to bound the values of Q (the specific dissipationExpand
Tidal Evolution of Exoplanets
Tidal effects arise from differential and inelastic deformation of a planet by a perturbing body. The continuous action of tides modify the rotation of the planet together with its orbit until anExpand
Rotation of Mercury: Theoretical Analysis of the Dynamics of a Rigid Ellipsoidal Planet
The second-order nonlinear differential equation for the rotation of Mercury implies locked-in motion when the period is within the range where e is the eccentricity and T is the period of Mercury'sExpand
Thermal and tidal effect on the rotation of Mercury
It is shown that the influences of the thermal and tidal effects on Mercury's libration are in equilibrium with the periods of rotation and revolution of Mercury locked in the 3∶2 resonant state. TheExpand
Rotation Period of the Planet Mercury
THE recent radar measurements of Mercury indicate that the period of rotation of the planet is 59 ± 5 days1. This result is in complete disagreement with the previously quoted value of 88 days basedExpand
An Overview of the Rotations of Planets in the Solar System
This chapter can be divided into three sections. The ?rst one presents two alternative theoretical ways for calculating the rotation of any celestial body, insisting on the di?erence between the freeExpand