Jisho

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不規則衛星
Wikipedia definition
1. Irregular moonIn astronomy, an irregular moon is a natural satellite following a distant, inclined, and often eccentric and retrograde orbit. They are believed to have been captured by their parent planet, unlike regular satellites, which form in situ. Ninety-three irregular satellites have been discovered since 1997, orbiting all four of the giant planets. Before 1997, only ten were known, including Phoebe, the largest irregular satellite of Saturn, and Himalia, the largest irregular satellite of Jupiter.
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