90482 Orcus given the designation S/2005 (90482) 1 before later being named "Vanth". It orbits Orcus in a nearly face-on circular orbit with an eccentricity of about 0.007, and an orbital period of 9.54 days. Vanth orbits only from Orcus and is too close to Orcus for ground-based spectroscopy to determine the surface composition of the satellite. Mike Brown suspects that like the Pluto–Charon system, Orcus and Vanth are tidally locked. Vanth does not resemble known collisional satellites because its spectrum is very different from that of its primary, and it may be a captured KBO. Vanth could also have originated as
Sinmara Orcus, a god of the underworld in Roman mythology, and that Hel is blue or half blue and half light, like the Roman goddess Proserpina, whom Saxo equates to Hel in his "Gesta Danorum". Falk further notes that Sinmara is referred to as "aurglasis Eirr", which he translates as "the goddess of the gold ring", and compares Hel's being called "Gjallar sunnu gátt" "wearer of the necklace" in stanza 9 of the poem "Forspjallsljóð". Björn Olsen associates the kenning with "veðurglasir", a name of Yggdrasill in stanza 24 of the same poem, and translates "aurglasir" as a name for the