For other uses, see Eris.

Eris is a dwarf planet in the outer Sol system, designated 136199.

One of the first such bodies to be discovered by Humans, Eris' highly-inclined orbit meant that it spent part of its orbital period a significant distance from Sol and Earth. This remote location, along with Eris' relatively large size, proved to be perfect for the Federation Department of Temporal Investigations, which used the dwarf planet as the location of the Eridian Vault.

Eris has one moon, Dysnomia, and was named for the ancient goddess of discord. (DTI novel: Watching the Clock)

The Last Unicorn RPG module: A Cadet's Guide to Sector 001 Earth discusses a 10th planet in the Sol system named Prosperpine. The RPG was published years before the discovery of Eris.

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