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regular moon
In astronomy, a regular moon is a natural satellite following a relatively close and prograde orbit with little orbital inclination or eccentricity. They are believed to have formed in orbit about their primary, as opposed to irregular moons, which were captured.
There are at least 55 regular satellites of the eight planets: one at Earth, eight at Jupiter, 22 named regular moons at Saturn (not counting hundreds or thousands of moonlets), 18 known at Uranus, and 6 small regular moons at Neptune. (Large Triton appears to have been captured.) It is thought that Pluto's five moons and Haumea's two were formed in orbit about those dwarf planets out of debris created in giant collisions.
==See also==
*Irregular moon
*Inner moon
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「regular moon」の詳細全文を読む
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