Dwarf Planet
A distant, icy dwarf planet whose discovery helped trigger Pluto's reclassification.
| Type | Dwarf Planet |
|---|---|
| Distance from the Sun | 67.86 AU |
| Diameter | 2,326 km |
| Mass | 1.66 × 10²² kg |
| Surface gravity | 0.82 m/s² |
| Temperature | -231°C |
| Moons | 1 |
| Rings | No |
| Orbital period | 203,830 days |
| Rotation period | 25.9 hours |
| Apparent magnitude | 18.6 |
| Redshift | 0 |
| Discovered | 2005 |
Dwarf planets are round for the same reason planets are, gravity, but share their orbit with other bodies a full planet would have swept aside or absorbed.
At 2,326 km across, Eris is 18 percent of the diameter of Earth.
Its mass is 0.3 percent of the mass of Earth.
It keeps an average distance of 67.86 AU from the Sun, so sunlight takes 9.4 hours to reach it.
A single orbit takes 558 years.
An average temperature of 42 K works out at -231 degrees Celsius, colder than the 15 degrees Earth averages.
One moon is known to orbit it.
It has been on record since 2005.
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