Dysnomia (moon)

Dysnomia^[1] is the only known moon of the dwarf planet Eris. It was found on September 10, 2005 by Michael E. Brown and his team at the W. M. Keck Observatory.^[2] It is probably about 600 km in diameter (across),^[2] although it may be up to 800 km in diameter.^[2] The moon was named Dysnomia^[3] (from the Ancient Greek word Δυσνομία that means "lawlessness") after the daughter of the Greek goddess Eris.^[4]

Dysnomia shown in its orbit around Eris. Eris is not as big as it appears: the image was over-exposed for Dysnomia to be visible