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8 votes

Orbital resonance and the precession of the periapsis

The revolution period of a body is the time it takes to return to pericenter. So, for example, Io will return to its perijove after 1.769 days, and Europa to its own perijove after 3.551 days. But ...
Pierre Paquette's user avatar
4 votes

Could a planet or its moon be synchronously tidally locked with the sun, but still in orbit with its moon/planet?

The negative (decelerating) tidal torque of the star is trying to synchronise the planet's rotation with its mean motion $n_p$ about the star. (Rare exceptions are close-in planets with a high ...
Michael_1812's user avatar
  • 1,456

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