Moon
Dysnomia
Moon of Eris
Dysnomia, formal designation (136199) Eris I, is the only known moon of the dwarf planet Eris and is the second-largest known moon of a dwarf planet, after Pluto I Charon. It was discovered in September 2005 by Mike Brown and the Laser Guide Star Adaptive Optics (LGSAO) team at the W. M. Keck Observatory. It carried the provisional designation of S/2005 (2003 UB313) 1 until it was officially named Dysnomia (from the Ancient Greek word Δυσνομία (Dysnomía) meaning lawlessness) in September 2006, after the daughter of the Greek goddess Eris.
Description from Wikipedia (CC BY-SA 4.0).
Key facts
Distance
Orbits Eris
Orbits
Eris
Mean radius
257 km
Orbital period
15.8 days
Discovered
2005 · Michael E. Brown
Orbits
Eris
