Dīs Pater Dīs Pater Dīs Pater (pronounced ) was a Roman god of the underworld. Dis was originally associated with fertile agricultural land and mineral wealth, and since those minerals came from underground, he was later equated with the chthonic deities Pluto (Hades) and Orcus. "Dīs Pater" was commonly shortened to simply Dīs and this name has since become an alternative name for the underworld or a part of the underworld, such as the City of Dis of Dante's "The Divine Comedy", which comprises Lower Hell. It is often thought that Dīs Pater was also a Celtic god. This confusion arises from
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