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About Orcus
90482 Orcus is a Kuiper Belt Object and a possible dwarf planet, in a 2:3 mean-motion resonance with Neptune (like Pluto), but 180° out of phase with Pluto — earning it the nickname “anti-Pluto.” It has a large moon, Vanth (~475 km), making the Orcus system a mini-binary similar to Pluto-Charon.
Physical Properties
455 km
6.32e20 kg
13.188 h
0.231
Orbit
Sun
39.174 AU
0.2263
20.573°
245.18 yr
Notable Moons
Sources & Further Reading
Numerical values (radius, mass, orbital elements, temperatures) are drawn from NASA NSSDC Planetary Fact Sheets, JPL Horizons, and the JPL Small-Body Database. Last refreshed: 2026-06-08 19:13:21.