90482 Orcus This means that Orcus is currently viewed pole-on, which could explain the near absence of any rotational modulation of its brightness. If, however, the primary is tidally locked with the satellite, the rotational period will coincide with the 9.7-day orbital period of Vanth. This minor planet was named after one of the Roman gods of the underworld, Orcus. While Pluto was the ruler of the underworld, Orcus was a punisher of the damned. The approved naming citation was published by the Minor Planet Center on 26 November 2004 (). Under the guidelines of the International Astronomical Union's (IAU) naming conventions,
Tomb of Orcus belonged to the Murina family, an offshoot of the Etruscan Spurinnae. The foundation is inscribed with the following enigmatic phrase: Orcus I was built between 470 and 450 BC (perhaps by a man named Leive; see below); a separate hypogeum, Orcus II, was built c. 325 BC. At some point in antiquity the wall between the two was removed, creating a large tomb with two dromes (entrances). The tomb was excavated in 1868 by an officer of the French Army. Upon its discovery, the excavator mistook the painting of a cyclops for the Roman god Orcus (see below), hence the