Orcus

Orcus was discovered in February 2004 and known as 2004DW. The discovery images of this object were acquired on February 17, 2004. Precovery images as early as November 8, 1951 were later identified. Orcus's 247 year orbit is shaped similarly to Pluto's (both have perihelia above the ecliptic), but is differently oriented. Under the guidelines of the International Astronomical Union's naming conventions, objects with a similar size and orbit to that of Pluto are named after underworld deities. Accordingly, the discoverers suggested naming the object after Orcus, a god of the dead in Roman mythology. The name was approved and published on November 22, 2004.