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Eris, the largest dwarf planet. Eris is a dwarf planet that lies at the outer reaches of our solar system. It was discovered in 2005 by professional astronomers who were examining images taken at California's Palomar Observatory two years previously.
This was announced as the IAU's Definition of a Planet in the Solar System, adopted on August 24, 2006. At this time both Eris and Pluto were classified as dwarf planets, a category distinct from the new definition of planet. Brown has since stated his approval of the dwarf planet label. The IAU subsequently added Eris to its Minor Planet Catalogue, designating it (136199) Eris.