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Jupiter Moon: Adrastea!

An image of Adrastea was taken by Galileo's solid state imaging system between November 1996 and June 1997.

Because of its closeness to Jupiter, very little is known about this moon. Adrastea is extremely small and irregular in shape. Like its inner neighbor, Metis, it orbits faster than Jupiter spins on its axis, a situation that results in orbital instability and will eventually cause Adrastea to spiral into Jupiter's atmosphere. Adrastea is 20 kilometers (12 miles) in diameter and orbits 129,000 kilometers (80,000 miles) from Jupiter. Adrastea is a sheperd moon of Jupiter's main ring and, together with Metis, appears to be the source of the material making up this ring. In Greek mythology, Adrastea is the daughter of Jupiter and nanke who is responsible for distributing rewards and punishments. It was discovered by D. Jewitt and E. Danielson in 1979 (Voyager 2).


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