136199 Eris
Slightly heavier than Pluto, and the discovery that forced the word 'planet' to be defined.
Where it is right now
136199 Eris is in Cetus, 95.2 AU away, magnitude 18.6.
Computed for 2 August 2026, 17:00 UTC, and recomputed at least hourly. This page is cached, so treat the line above as accurate to the hour rather than to the second. The map shows the live position.
Position from a Kepler propagation of the published elements below, accurate to about an arcminute.
Facts
Every line carries the source it came from.
- Diameter
- 2,326 kmSource: Published occultation and Herschel/Spitzer radiometry results
- Orbital period
- 559.9 yearsSource: NASA/JPL Small-Body Database
- Distance from the Sun
- 67.934 AU on averageSource: NASA/JPL Small-Body Database
- Orbit shape
- eccentricity 0.438, inclined 43.9 degrees to the eclipticSource: NASA/JPL Small-Body Database
- Class
- Trans-neptunian objectSource: NASA/JPL Small-Body Database
- Discovered
- 2003-Oct-21 by Brown, M. E., Trujillo, C. A., Rabinowitz, D.Source: NASA/JPL Small-Body Database
Physical size
- Mean radius
- 1,163 km
- Diameter
- 2,326 km across
- Absolute magnitude H
- -1.26
Orbit
Elements are heliocentric, referred to the J2000.0 ecliptic.
- Average distance from the Sun
- 67.934 AU (10,162.8 million km)
- Closest and furthest
- 38.163 AU (5,709.0 million km) to 97.705 AU (14,616.5 million km)
- Eccentricity
- 0.4382, strongly elliptical
- Inclination to the ecliptic
- 43.93 degrees
- Orbital period
- 560 years
- Longitude of ascending node
- 36.00 degrees
- Argument of periapsis
- 150.79 degrees
- Mean anomaly at J2000.0
- 194.78 degrees
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Catalog id eris. 3,172 objects on the map, of which 171 are hand-authored with sourced facts.