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Moon of Neptune

Triton

Mean radius1,352.6 km
Orbit (semi-major axis)354,800 km
Orbital period5.879 days
Discovered10 Oct 1846, 17 days after Neptune

Its orbit is inclined 157° (JPL): it circles Neptune backwards, against the planet's spin.

Voyager 2 found active geysers in 1989 and a surface at −235 °C.

Sources

  1. NASA Science, Triton
  2. JPL Solar System Dynamics, Planetary Satellite Physical Parameters
  3. JPL Solar System Dynamics, Planetary Satellite Mean Elements
See it in 3D →
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