Moon
Triton
The only large moon orbiting Neptune retrograde — probably a captured Kuiper Belt object. Known for its nitrogen geysers and "cantaloupe" terrain.
| Type | Moon |
|---|---|
| Parent body | Neptune |
| Radius | 1,353 km · 0.212 R⊕ |
| Mass | 2.139 × 10²² kg · 0.00358 M⊕ |
| Mean density | 2.06 g/cm³ |
| Surface gravity | 0.779 m/s² · 0.079 × Earth |
| Escape velocity | 1.45 km/s |
| Rotation period | Tidally locked (always shows the same face) |
| Orbital radius | 354,760 km (Neptune) |
| Eccentricity | 0.000 |
| Orbital period | 5.88 days |
| Temperature | 38 K (-235 °C) |