potato-shaped Ida is much larger, measuring about 60 kilometers long and 25 km wide. Dactyl is the first moon of an asteroid ever discovered -- now many asteroids are known to have moons. The names Ida and Dactyl are from Greek mythology.
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& Michigan Tech. U.
Based on Astronomy Picture Of the Day
Publications with keywords: Ida - Dactyl - asteroid
Publications with words: Ida - Dactyl - asteroid