Eris
CategoryDwarf Planet
SystemKuiper Belt
Diameter2326 km
Orbital Period559 years
About Eris
Slightly smaller than Pluto but 27 percent more massive. Its discovery in 2005 triggered the debate that led to Pluto being reclassified. Has one known moon, Dysnomia. Extremely distant, currently about 96 AU from the Sun. Surface temperature is about -243C. Takes 559 years to orbit the Sun. The most massive known dwarf planet.
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