Dysnomia (moon)
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Dysnomia, formal designation 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 b
Low-resolution image of Eris and Dysnomia as imaged by the Hubble Space Telescope, August 2006
Discovery image of Dysnomia
Artist's conception of Dysnomia's dark surface, with dwarf planet Eris in the background
Eris and Dysnomia (lower left) imaged by the James Webb Space Telescope NIRCam in August 2024
Orcus (dwarf planet)
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Orcus is a dwarf planet candidate located in the Kuiper belt, with one large moon, Vanth. It has an estimated diameter of 870 to 960 km, comparable to the Inner Solar System dwarf planet Ceres. The su
Dysnomia (moon)
…physical properties indicate Dysnomia likely formed from a large impact on Eris, in a similar manner to other binary dwarf planet systems like Pluto and Orcus, and the Earth–Moon system. Mike Brown, the moon's discoverer, chose the name Dysnomia for the moon. As the daughter of Eris, the mythological Dysnomia…
Discovery image of Orcus taken in 2004
Long-exposure photograph of Orcus at visual magnitude 19.2
Ceres RC3 Haulani Crater
Pluto in True Color High Res