What is Asteroid moon?
[[Image:243 ida.jpg|thumb|right|The asteroid [[243 Ida]] and its moon Dactyl.]] An '''asteroid moon''' is an [[asteroid]] that [[orbits]] or goes around another asteroid. Asteroid moons are quite rare. Only 2% of asteroids are thought to have moons. To be an asteroid [[Satellite (natural)|moon]], an asteroid has to be smaller than the object it goes around. If they are roughly the same size they are called a [[Binary asteroid|binary pair]]. [[Dimorphos]] is an asteroid moon that is famous as the target of the [[Double Asteroid Redirection Test]]. == References == # <small>Chiang, E.; Lithwick, Y.; Buie, M.; Grundy, W.; Holman, M.; ''A Brief History of Trans-Neptunian Space'', to appear in ''Protostars and Planets V'' (August 2006) [[arxiv:astro-ph/0601654|Final preprint on arXiv]]</small> {{Solar System}} {{sci-stub}} [[Category:Asteroids]] [[Category:Moons]]