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Astronomy Picture of Day: Asteroid and Moon
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Astronomy Picture of Day: Asteroid and Moon# Astronomy - 天文
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Ida and Dactyl: Asteroid and Moon
Explanation: This asteroid has a moon! The robot spacecraft Galileo currently exploring
the Jovian system, encountered and photographed two asteroids during its long journey to
Jupiter. The second asteroid it photographed, Ida, was discovered to have a moon which
appears as a small dot to the right of Ida in this picture. The tiny moon, named Dactyl, is
about one mile across, while the potato shaped Ida measures about 36 miles long and 14
miles wide. Dactyl is t
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