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ida
An "S-type", main belt asteroid of silicaceous chemical composition. 251 Ida exhibits an irregular, heavily cratered surface and measures 55 x 24 x 20 km making it the largest member of a compositionally similar group called the Koronis Family. Ida rotates every 4.6 hours on its axis and was first photographed by the Galileo spacecraft in 1993. At about 100 km from its center, Ida is orbited by the small satellite, Dactyl, which measures 1.6 x 1.4 x 1.2 km. Dactyl is the first evidence that asteroids may have tiny moons. Crater density on Ida is 5 times that of Gaspra from which it is inferred that Ida is the older of the two.
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