The dwarf planet Eris is the largest KBO. It was discovered in 2005 in images taken two years earlier at Palomar Observatory in California, U.S. Before it received its official name, Eris was known by the provisional designation 2003 UB313; it was nicknamed "Xena" by its discoverers and also briefly termed the "10th planet."

Eris's diameter of roughly 2,500 km (1,550 miles) makes Eris slightly larger than Pluto. Eris revolves once about every 560 Earth years in a highly tilted, elliptical orbit. From its spectrum its surface appears to be coated with white methane ice. Eris has at least one moon, Dysnomia, about one-eighth its size, with an orbital period about two weeks long.

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