Jisho

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小惑星衛星
Wikipedia definition
1. Minor-planet moonA minor-planet moon is an astronomical body that orbits a minor planet as its natural satellite. It is thought that many asteroids and Kuiper belt objects may possess moons, in some cases quite substantial in size. Discoveries of minor-planet moons (and binary objects, in general) are important because the determination of their orbits provides estimates on the mass and density of the primary, allowing insights of their physical properties that is generally not otherwise possible.
Read “Minor-planet moon” on English Wikipedia
Read “小惑星の衛星” on Japanese Wikipedia
Read “Minor-planet moon” on DBpedia

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