Vanth, officially named Orcus l, is the single known natural satellite of the plutino and likely dwarf planetOrcus. It was discovered by Mike Brown and T.A. Suer using discovery images taken by the Hubble Space Telescope on November 13, 2005. The discovery was announced on 22 February 2007 in IAUC 8812. "Vanth orbits Orcus in a tight precise circle", with a period of approximately 10 days. Brown suspects that, like Pluto and Charon, Orcus and Vanth are tidally locked. Vanth was issued a provisional designation, S/2005 (90482) 1. On March 23, 2009, Brown asked readers of his weekly column to suggest possible names for the satellite, with the best one to be submitted to the International Astronomical Union (IAU) on April 5. The name Vanth, the winged Etruscan psychopomp who guides the souls of the dead to the underworld, was chosen from among a large pool of submissions. Vanth was the only suggestion that was purely Etruscan in origin. It was the most popular submission, first suggested by Sonya Taaffe. This submission was assessed and approved by the IAU's Committee for Small Body Nomenclature in their March 30, 2010 circular.
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