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Dysnomia (moon) : ウィキペディア英語版 | Dysnomia (moon)
Dysnomia (Greek: ''Δυσνομία'')—officially (136199) Eris I Dysnomia—is the only known moon of the dwarf planet Eris (the most massive known dwarf planet in the Solar System). It was discovered in 2005 by Mike Brown and the laser guide star adaptive optics team at the W. M. Keck Observatory, and carried the provisional designation of until officially named ''Dysnomia''〔 (from the Ancient Greek word meaning "lawlessness") after the daughter of the Greek goddess Eris. == Discovery == During 2005, the adaptive optics team at the Keck telescopes in Hawaii carried out observations of the four brightest Kuiper belt objects (Pluto, , , and ), using the newly commissioned laser guide star adaptive optics system. Observations taken on 10 September revealed a moon in orbit around Eris, provisionally designated . In keeping with the ''Xena'' nickname that was already in use for Eris, the moon was nicknamed "Gabrielle" by its discoverers, after Xena's sidekick.〔〔
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