Eris, also 136199 Eris, is the most massive and second-largest dwarf planet known in the Sol System. Eris is a trans-Neptunian object in that its orbit is outside that of the planet Neptune.
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Eris is the ninth-most-massive known body directly orbiting the Sun. It is 27% more massive than Pluto, though Pluto is slightly larger by volume.
Moons[]
Eris has one known moon named Dysnomia with an estimated diameter of 700 (± 115) km and an almost circular orbit at a distance of about 37,430 km. It orbits Eris in ~15 days and 18 hours. Dysnomia was discovered in September 2005. Its initial name was S/2005 (2003 UB313) 1.
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- Eris was discovered in January 2005 by a team of the Palomar Observatory in California.[1]
- Eris is named by the Greek goddess of strife and discord, Eris.[1]
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