What makes this world interesting
The discovery of Eris contributed to clarifying the definition of planets in 2006. Its very elongated orbit is a reminder that the regions beyond Neptune are more than a collection of regular circles.
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Dwarf planet
Eris
A discovery that changed the categories
A distant world close to Pluto in size, accompanied by the moon Dysnomia.
- Family
- Trans-Neptunian object
- Main moon
- Dysnomia
- Discovery announcement
- 2005
Observe or explore it
An extremely faint target. Its distance varies greatly throughout its orbit; a stated distance is never a permanent position.
Connect the discoveries
Sources and reference information
Rounded educational data, sources consulted on 18 October 2026. Orbital distances are mean reference distances from the Sun, not current distances from Earth. Periods are expressed in Earth time. The planner provides date-specific positions for supported targets.