Planetary spin and satellite formation

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Gas Giant Planets, Natural Satellites, Planetary Rotation, Protoplanets, Angular Momentum, Eccentric Orbits, Planetary Orbits, Solar Orbits, Solar System, Spin

Scientific paper

Some theories of Solar System formation postulate an initial state with giant gaseous protoplanets in highly eccentric orbits. It is shown that this could lead to considerable spin angular momentum being imparted to tidal bulge material during a perihelion passage. The distorted collapsing protoplanet would leave behind a filamentary tail, rotating about the central mass, within which protosatellite condensations could form. The characteristics of the regular satellite families of Jupiter and Saturn seem to be quite well explained by the model. The relationship of the satellite system of Uranus to the planet suggests a tidal origin but not due to the Sun alone. This supports a suggestion previously made that the spin axis and satellite family of Uranus could be due to a close interaction with another protoplanet in the early Solar System.

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