Eris in 3D: live position and orbit

More massive than Pluto. Its discovery in 2005 forced astronomers to define what a planet is, and cost Pluto its status. It roams up to three times farther from the Sun than Pluto.

Eris is shown at its real position, computed from NASA/JPL ephemeris data. The view opens on Eris; 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.

Radius

1 163 km¹

Mass

1.66 × 10²² kg¹ (derived value)

Surface gravity

0.82 m/s²¹ (derived value)

Mean distance from the Sun

67.835 AU² (derived value)

Orbital period

203 933 days² (derived value)

Sidereal rotation

16 days³

Known moons

1 (as of October 2026)⁴

Sources

1. Sicardy et al., A Pluto-like radius and a high albedo for the dwarf planet Eris from an occultation. Nature 478, 493. 2011. read 2026-09-17. https://www.nature.com/articles/nature10550
2. NASA JPL Solar System Dynamics, Horizons System (osculating orbital elements). read 2026-09-17. https://ssd.jpl.nasa.gov/horizons/
3. Szakáts et al., Tidally locked rotation of the dwarf planet (136199) Eris discovered from long-term ground based and space photometry. Astronomy & Astrophysics 669, L3. 2023. read 2026-09-17. https://arxiv.org/abs/2211.07987
4. NASA JPL Solar System Dynamics, Small-Body Database. read 2026-09-17. https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html