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Encyclopedia > Jupiter > Satellites> Callisto II

CHARACTERISTICS OF CALLISTO (J-4)



Characteristics Values
Semi-major axis in km  1 883 000 
Revolution period  16.689 days 
Rotation period  16.689 days
Orbital velocity 8 km/s
Inclination of the orbit on the equator of Jupiter 0.74°
Eccentricity of the orbit 0.007
Equatorial diameter (Earth=1)  0.38
Equatorial diameter 4800 km
Visual magnitude at opposition 5.65
Flattening  0 
Mass (Jupiter=1)  5.7/100 000 
Density (Water=1)  1.85 
Gravity at surface (Earth=1) 0.37
Escape velocity 2450 m/s
Reflectivity (geometric albedo) 0.2
The highest peak  ? 
Deepest pit  ? 
Atmosphere no
Composition ice 
carbonate silicates

Origin of the name : click here.

 
Image from Voyager
Credit : NASA

Here, the concentric circles are due to a former impact. The recent impacts show white spots indicating water bebeath the surface under the form of ice.