Due to Eris discovery, all pluto-like objects are called plutiod or dwarf planet. Eris recieved her name from a greek goddes, who is of discord and strife. "Eris caused strife and discord by causing quarrels among people and that's what this one has done too," said Mike Brown "| quote cited She was discovered by Michael Brown of the California Institute of Technology, Chad Trujillo of Gemini Observatory, and David Rabinowitz of Yale University.

Eris can be located at R.A. 01h 39m 24s.34 and Dec. -05° 10' 11".0. Eris is a member of the | Kuiper Belt, a swam of icy bodies beyond Neptune in orbit around the sun. It is the fourth brightest kuiper belt object. The KBO orbit 2.8 to 4.6 billion miles (30-50 AU) from the sun. There are different kinds of KBO. Plutinos (mini-Plutos) are those that has similar orbits like Pluto's. Cubewanos are those with orbits that are more like circles. Not only is Eris is a member of the KBO but it is also considered a Scattered Disk Objects (SDO), which is bodies that orbit out of the main plane of the solar system and form part of the population of trans-Neptunian objects (TNOs) that exist at the outer edge of the solar system beyond Neptune. SDO orbit is very eccentric and the distance to the sun varies enomously and can reach billions of km.

Eris is 27% more massive, and 5% larger than Pluto. It is 10 billion miles away from the sun, making it the most distant object ever seen in oribit around the sun. It takes 557 yers to orbit around the sun, which takes more than twice as long than Pluto. Just like Pluto, it is made of half rock and half ice. However, Eris's methane is more yellowish compare to Pluto's reddish methane, and it reflects about 86% of the sunlight compare to 60% for Pluto. Eris like other planets also has a moon name Dysnomia.

Dysnomia is the daughter of Eris who is a mythological demon spirit of lawlessness. Dysnomia is about 60x fainter than Eris with a diameter estimated to be approximately 8x smaller. The moon orbital period is thought to be about two weeks, half of Earth's moon. Dysnomia appears to be similar to the moon of 2003 EL61, code name Santa, with satellite name Rudolph.with nothing but frozen water. Eris's moon possibaly may has a darker surface than Eris's very frosty highly reflictive surface.