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Eris (dwarf planet)
dwarf planet in the Solar System / From Wikipedia, the free encyclopedia
Eris (symbol )[1] is a dwarf planet and a trans-Neptunian object (TNO).[2] It is the second-largest known dwarf planet in the Solar System. Eris is slightly smaller than Pluto, but it has more mass than Pluto.
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It is a "scattered disc object" in the Kuiper belt, further out than Pluto. It is also called a plutoid because the IAU decided to rename all trans-Neptunian dwarf planets as plutoids.[3] Eris orbits the sun once every 557 Earth years.[4] It has an elliptical orbit, inclined at an angle of 44° between the plane of the orbit of the planet and the ecliptic, the plane containing Earth's orbital path.[5]