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 with the normal object naming procedures. Vanth was found at 0.25 arcsec from Orcus with magnitude difference of . Estimates made in 2009 by Mike Brown show that the apparent magnitude of Vanth is which is magnitudes fainter than Orcus. Assuming equal albedos this would mean a diameter of 280 km, or 2.9 times smaller than the primary. However, the dissimilar colors of Orcus (neutral) and Vanth (red) suggest that Vanth could have an albedo a factor of two lower than Orcus. Should Vanth have an albedo of only 0.12, Vanth could be as large as 380 km with Orcus