Tags: Planet.
Dysnomia officially (136199) Eris I Dysnomia (Greek: Δυσνομία) 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 S/2005 (2003 UB313) 1 until officially named Dysnomia (from the Ancient Greek word Δυσνομία meaning lawlessness) after the daughter of the Greek goddess Eris.
