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Description
90482 Orcus, provisional designation 2004 DW, is a trans-Neptunian object with a large moon , Vanth . With a diameter of 910 km (570 mi), it is a possible dwarf planet .[10] The surface of Orcus is relatively bright with albedo reaching 23 percent, neutral in color and rich in water ice. 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 on its surface. It was discovered by American astronomers Michael Brown , Chad Trujillo , and David Rabinowitz on 17 February 2004.

Description
90482 Orcus, provisional designation 2004 DW, is a trans-Neptunian object with a large moon , Vanth . With a diameter of 910 km (570 mi), it is a possible dwarf planet .[10] The surface of Orcus is relatively bright with albedo reaching 23 percent, neutral in color and rich in water ice. 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 on its surface. It was discovered by American astronomers Michael Brown , Chad Trujillo , and David Rabinowitz on 17 February 2004.