Story of Callisto
Orbit - Rotation
He is the outermost of the four Galilean Moons, and has a semi-major axis of about 1,880,000 km, which is significantly larger than Ganymedeball's SMA. Because he is so distant, he is not locked in the laplace resonance that the other three Galilean Moons are in. His orbit also is slightly eccentric and relatively inclined to Jupiterball's equatorial plane. Like many other Jovian moons, he is tidally locked to Jupiterball, rotating every 16.7 days. Such isolation means that Callistoball does not enjor significant tidal heating the other three Galilean Moons experience, and also means the charged-particle flux from Jupiterball's large magnetosphere is also significantly lower.
A real life photo of Callisto for reference