Home Today Years Ago August 28, 1993: First Known Asteroid Moon Discovered
August 28, 1993: First Known Asteroid Moon Discovered

August 28, 1993: First Known Asteroid Moon Discovered

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Today in 1993, the first asteroid moon was discovered from pictures taken by the unmanned spacecraft Galileo while en route to Jupiter. The moon was discovered orbiting the 243 Ida asteroid. Ida (discovered in 1884) was named after a nymph from Greek mythology, Idaea, which also inspired the name of Mount Ida. Fittingly, the moon was named Dactyl after the creatures that supposedly inhabited Mount Ida. Dactyl is less than a mile in diameter and about 1/20 the diameter of Ida.