The Galileo space probe has found and photographed two asteroids on its long trip to Jupiter. The second asteroid he has photographed, Ida, has turned out to have a satellite, which appears in this photograph as a small dot to the right of Ida.
The small moon, called Dactyl, is about a kilometer and a half in size, while Ida, with its potato shape, is about 58 kilometers long and 23 kilometers wide.
Dactyl is the first moon that has been discovered to an asteroid. The names Ida and Dactyl are based on characters from Greek mythology. Now it is known that other asteroids have moons.
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