Charon by New Horizons on 13 July 2015
Adjective(s) Unknown
Orbital properties
Aphelion/apoapsis Unknown
Perihelion/periapsis Unknown
Semi-major axis 17536±4 km to system barycenter,19571±4 km to the center of Pluto
Orbital eccentricity 0.00
Orbital period 6.3872304±0.0000011 d(6 d, 9 h, 17 m, 36.7 ± 0.1 s)
Average orbital speed 0.21 km/s
Physical properties
Radius 603.5±1.5 km(0.095 Earths)
Mass (1.52±0.06)×1021 kg(2.54×10−4 Earths)(11.6% of Pluto)
Mean density 1.65±0.06 g/cm3
Escape velocity 0.580 km/s
0.36 mi/s
Rotation period synchronous
Average surface temperature −220 °C (53 K)
Apparent magnitude 16.8
Moons 0

Charon is the largest moon of the planet Pluto.


  • It is the largest moon in the solar system compared to the body it orbits.
  • Charon was discovered in 1978 by James W. Christy.
  • Because its gravitational effects on Pluto, some scientists say Pluto and Charon are a binary system. It has been debated whether it should be considered a Moon or a binary planet.

Moons of Pluto