136199 Eris

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136199 Eris
Dwarf planet Eris. Sol can be seen in the lower-right corner of the image.
Planetary characteristics
Orbitsemi-major axis 67.781 AU, eccentricity 0.44068
Diameter1163±6 km
Surface Gravity0.083±0.002 g
Year203,830 days (558.04 Earth years)
Day25.9±0.5 hours (sidereal rotation period)
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136199 Eris is the most-massive known Sol-system dwarf planet.

It was discovered by Mike Brown, Chad Trujillo, and David Rabinowitz on January 5, 2005, and is named after the Greek personification of discord.

Eris has one known moon, Dysnomia.