Minor-planet moon

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243 Ida and its moon Dactyl as imaged by the Galileo spacecraft in 1993

A 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. , there are over 200 minor planets known to have moons.

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