The Moon of Eris

The only confirmed natural satellite orbiting Eris is small without the mass/self-gravity necessary to assume a spherical shape:

Dysnomia [1] was discovered by Mike Brown and the Adaptive Optics team at the Keck Observatory in Hawaii on September 10, 2005. It was named after the demon of lawlessness, daughter of the Greek goddess Eris and is estimated to be between 100 and 250 km in diameter. Its physical composition and its atmosphere if any are unknowns, though it's possible that the moon formed from the coalescing of impactor debris the result of another large body striking its primary (impacts between large KBOs are suspected to have been fairly frequent during the Solar System's early history). [2]

[1] Originally nicknamed Gabrielle (the television sidekick of Xena) because of its affiliation with Eris.

[2] Both Eris and Dysnomia represent chaos, fitting when one considers the role they played in redefining the old familiar nine planet Solar System, after all Eris was larger than Pluto and Pluto was a planet. [3]

[3] Actually it's now known (thanks to New Horizons) that Pluto is the larger.

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