Eris’s moons

1 confirmed moon in this source snapshot.

Snapshot 2026-09-09 · 0 with mass estimates · catalog 1.0.0

Eris’s confirmed moons, sorted by mean radius with unknown radii last.
Moon	Mean radius · km	Semimajor axis · km	Period · days
DysnomiaS/2005 (136199) 1	Mean radius · km—	Orbit axis · km—	Period · days—

Mean radii descend; missing radii follow. A dash means no value in these sources. Orbit summaries describe average shapes, and do not supply dated positions.

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