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Moon of Pluto

Charon

Mean radius606 km
Orbit (semi-major axis)19,600 km
Orbital period6.387 days

Charon's orbit and Pluto's day both last 6.4 Earth days, so each always shows the other the same face.

Discovered in June 1978 by James Christy and Robert Harrington.

Sources

  1. NASA Science, Charon
  2. JPL Solar System Dynamics, Planetary Satellite Physical Parameters
  3. JPL Solar System Dynamics, Planetary Satellite Mean Elements
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