90482 Orcus Etruscan equivalent of the Roman Pluto, and later became an alternate name for Pluto. The surface of Orcus is relatively bright with albedo reaching 23%, grey in color and water-rich. The ice is predominantly in crystalline form, which may be related to past cryovolcanic activity. Other compounds like methane or ammonia may also be present. The existence of a satellite allowed astronomers to determine the mass of the system, which is approximately equal to that of the Saturnian moon Tethys. The ratio of masses of Orcus and Vanth is uncertain, possibly anywhere from 1:33 to 1:12. The diameter of Orcus
Orcus (Dungeons & Dragons) includes some details about his realm and his return. Orcus was used as the driving force for the adventure "Headless", which appears on pages 47–66 of "Dungeon" #89 (November 2001). Although the adventure recommends not having Orcus fight the player characters directly, third edition game statistics are provided for Orcus on page 64 if he is to be used as a recurring villain. He only appears personally at the end of the adventure to reclaim one of his possessions and warn the characters to cease meddling in his affairs. Orcus is featured as one of the demon lords appearing in