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
Orc in a dark forest or garden and that might capture and eat humans, or be indifferent or even benevolent—all depending on the tale. Note that the Italian term "orco" is derived directly from the Latin Orcus, and is correctly translated into English as "ogre". In early Roman mythology, Orcus was a god of the underworld, and in medieval times, by association with death and the underworld, the term "orcus" also began to see use for other monstrous creatures and incorporated into the medieval bestiary. In particular, the Italian "orco" implies an anthropomorphic creature with bestial aspects, often demonic, suggestive of