Orcus in 3D: live position and orbit

Sometimes nicknamed the "anti-Pluto" for an orbit that mirrors Pluto's own 2:3 resonance with Neptune, timed so the two are never close together. Its large moon Vanth may be tidally locked to it, much like Charon is to Pluto.

Orcus is shown at its real position, computed from NASA/JPL ephemeris data. The view opens on Orcus; you can travel in time, switch between the educational overview and the true-scale voyage, and compare it with every other body of the solar system.

Mass

6.32 × 10²⁰ kg¹

Mean distance from the Sun

39.280 AU² (derived value)

Orbital period

89 859 days² (derived value)

Synodic rotation

13.19 hours³

Known moons

1 (as of October 2026)³

Sources

1. Brown et al., The size, density, and formation of the Orcus-Vanth system in the Kuiper belt. The Astronomical Journal 139, 2700. 2010. read 2026-09-28. https://arxiv.org/abs/0910.4784
2. NASA JPL Solar System Dynamics, Horizons System (osculating orbital elements). read 2026-09-17. https://ssd.jpl.nasa.gov/horizons/
3. NASA JPL Solar System Dynamics, Small-Body Database. read 2026-09-17. https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html