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CHARON is the largest and inner-most of Pluto's five moons. It was discovered by James W. Christy and Robert S. Harrington on June 22, 1978. Click here for the story of Charon's discovery.

Roughly 1/10 the mass of Pluto, Charon shares a common center of gravity with its primary. Due to the graviational interaction between Charon and Pluto, both bodies are tidally locked, meaning that Charon's orbital period is synchronized with Pluto's rotational period; and the moon always faces the same hemisphere of Pluto.

Distance from Pluto: 19,640 km (12,200 miles)

Diameter: 1,208 km (751 miles)

Orbital period: 6.3873 days

Rotational period: 6.3873 days

Surface temperature: -230C

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Charon

Image captured by New Horizons spacecraft on July 14, 2015. Image credit: NASA/JHUAPL/SwRI