Jupiter's Moon Callisto

More details below:
Size & Distance
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* Callisto is Jupiter’s second largest moon and the third largest moon in our solar system. 

* About the same size as Mercury.

* circumference at its equator is about 9,410 miles.

(click       below for greater depth 3D image - press escape to return)
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Geology
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* Galileo spacecraft indicate Callisto may have a subsurface ocean and scientists estimate it may be 155 miles below the surface.

 

* Callisto’s interior may have layers of ice mixed with rock and metal, possibly extending to its center.

 

* Callisto’s rocky, icy surface is the oldest and most heavily cratered in our solar system. 

 

* Looks like it’s sprinkled with bright white dots that scientists think are the peaks of the craters capped with water ice.

Atmosphere / Weather
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* Scientists announced in 1999 that the Galileo spacecraft detected a very thin carbon dioxide exosphere—an extremely thin atmosphere—on Callisto during its observations in 1997.

 

* More recent research indicates Callisto also has oxygen and hydrogen in its exosphere.

Orbit & Rotation
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* Callisto orbits about 1,170,000 miles from Jupiter and it takes about 17 Earth days for Callisto to complete one orbit of Jupiter.

 

* Callisto is tidally locked with Jupiter, which means that the same side of Callisto is always facing Jupiter.

* It takes the Jovian system—Jupiter and all of its moons—about 12 Earth years to complete one orbit of the Sun.

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For a yet more interactive and in-depth look at the moon click on this NASA link.... https://solarsystem.nasa.gov/moons/jupiter-moons/callisto/in-depth/
Credit NASA
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