Dwarf Planet
Pluto
The most famous dwarf planet of the Kuiper Belt. Known for the heart-shaped nitrogen-ice plain Sputnik Planitia, a blue layered atmosphere and a binary system with Charon.
| Type | Dwarf Planet |
|---|---|
| Radius | 1,188 km · 0.187 R⊕ |
| Mass | 1.303 × 10²² kg · 0.00218 M⊕ |
| Mean density | 1.85 g/cm³ |
| Surface gravity | 0.616 m/s² · 0.063 × Earth |
| Escape velocity | 1.21 km/s |
| Rotation period | 6.39 days (retrograde) |
| Orbital radius | 2,126 km |
| Eccentricity | 0.000 |
| Orbital period | 6.39 days |
| Temperature | 44 K (-229 °C) |
| Discovery | 1930, Clyde Tombaugh |
| Moons | 5 |
| Reclassification | 2006 (dwarf planet) |