Orc in common to them. A monster called "Orcus" is mentioned in Edmund Spenser's "Faerie Queene" (Book II, Canto XII, line xlvii). The word ultimately comes from Latin "Orcus", the demonic Roman god of death, who should not be confused with Pluto, the god of the underworld, and has transformed by several stages from the meanings "underworld", "hell", "devil", "evil creature" to "ogre". Tolkien and the lexicons he used attributed the origin of the doubtful Old English "orc" to "Orcus" and in one of his invented languages, the word for orc also had the form "orco". Words derived from or related
90482 Orcus relatively large satellite (Vanth, see below) may change them considerably. The absolute magnitude of Vanth is estimated at 4.88, which means that it is about 11 times fainter than Orcus itself. If the albedos of both bodies are the same at 0.23 then the size of Orcus is about , and the size of Vanth is about . The ALMA submillimeter measurements taken in 2016 showed that Vanth has a relatively large size of with albedo of about 8% while Orcus' has a slightly smaller size of 910 km. Using a stellar occultation by Vanth in 2017, Vanth's diameter has