• Key Information

  • Eris

  • Type
    Dwarf Planet (in the Scattered Disk)
  • Diameter
    1,445 miles
  • Distance from Sun
    3,557,511,689 to 9,059,194,082 miles
  • Orbit Time
    559.07 years
  • Length of Day
    15.786 days
  • Temperature
    -405 °F to -358 °F
  • Atmosphere
    Possible
  • Date of Discovery
    January 5, 2005
  • Moons
    1
  • Learning Point
  • When discovered, Eris helped push the idea of some of the "planets" should be called something different, leading to the new term "dwarf planet", of which Eris is the most massive (heavy) and the second largest (in size) after Pluto.
  • Project
  • Create a list of the biggest minor planets.
  • Location
  • Located in
    Solar System, orbiting the Sun
  • Fun Facts
  • It has been possible to find images of Eris on photographs taken as early as 1954.
  • Eris moves very slowly across the sky, which made it hard to find, even though it is possible to see with amateur telescopes.
  • The moon Dysomnia seems to have locked Eris' rotation so that the moon and dwarf planet face each other as they rotate.
  • At the moment Eris is one of the furthest objects in our Solar System that we can see.
  • The dwarf planet has a very high angle of orbit, which made it harder to find.