Dysnomia (moon)

? TBD

Moon of Eris

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Having one major moon that is large enough to move the barycenter outside the planet crops up pretty regularly among dwarf planets in the outer solar system:

en.wikipedia.org/wiki/Charon_...
en.wikipedia.org/wiki/Dysnomi...
en.wikipedia.org/wiki/Vanth_(...
en.wikipedia.org/wiki/...

Bluesky post by @cassinidivision.bsky.social

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Wikipedia

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...

Apparent mag. 23.1

Absolute mag. 5.6

Radius 257

Orbital period 15.772 days

Discovered 2005