Eris, discovered January 5, 2005, is the most massive dwarf planet in our solar system, but slightly smaller than Pluto. The team of Mike Brown, Chad Trujillo and David Rabinowitz discovered Eris from pictures taken in October 2003 and made the announcement in July 2005.
It has an orbit of 558 years and at its closest approach to the sun it is 37.91 astronomical units. At its maximum, it is almost three times that distance at 97.65 AU. Eris has one moon named Dysnomia, which, in Greek mythology, is the daughter of Eris.
Although more massive than Pluto, Eris is slightly smaller.
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