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Charon: Facts & Figures
   Back to Pluto   Overview   Gallery   Facts & Figures   Education   News 
Discovered By
James Christie
Date of Discovery
June 22, 1978
Orbit Size Around Pluto (semi-major axis)
Metric: 17,536 km
English: 10,896 miles
Scientific Notation: 1.754E+04 km (1.172E-04 A.U.)
Periapsis (closest)
Metric: 17,497 km
Apoapsis (farthest)
Metric: 17,575 km
English: 10,920 miles
Scientific Notation: 1.757E+04 km
Sidereal Orbit Period (Length of Year)
0.017486653 Earth years
6.387 Earth days
Orbit Circumference
Metric: 110,181.80 km
English: 68,463.80 miles
Scientific Notation: 1.102E+05 km
Average Orbit Velocity
Metric: 718.8 km/h
English: 446.6 mph
Scientific Notation: 200 m/s
Orbit Eccentricity
Orbit Inclination
Mean Radius
Metric: 603.6 km
English: 375.1 miles
Scientific Notation: 6.036E+02 km
Equatorial Circumference
Metric: 3,792.5 km
English: 2,356.6 miles
Scientific Notation: 3.7925E+03 km
Metric: 921,162,612 km3
Scientific Notation: 9.212E+08 km3
Metric: 1,546,625,822,956,300,000,000 kg
English: 1.5466E+21 lbs
Scientific Notation: 0.0003 kg
Metric: 1.678 g/cm3
Surface Area
Metric: 4,578,343.00 km2
English: 1,767,708.12 square miles
Scientific Notation: 4.578343E+06 km2
Surface Gravity
Metric: 0.283 m/s2
English: 0.929 ft/s2
Scientific Notation: 2.833E-01 m/s2
Escape Velocity
Metric: 2,105 km/h
English: 1,308 mph
Scientific Notation: 585 m/s
Sidereal Rotation Period (Length of Day)
6.387 hours
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Last Updated: 17 Jul 2015