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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 the first moon of an asteroid ever discovered. The names Ida and Dactyl are based on characters in Greek mythology. Do other asteroids have moons?
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NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
Based on Astronomy Picture
Of the Day
Publications with keywords: Ida - Dactyl - Moon - asteroid
Publications with words: Ida - Dactyl - Moon - asteroid
See also:
- APOD: 2025 August 23 Á Fishing for the Moon
- APOD: 2025 July 20 Á Lunar Nearside
- APOD: 2025 June 28 Á Lunar Farside
- APOD: 2025 June 20 Á Major Lunar Standstill 2024 2025
- APOD: 2025 June 18 Á Space Station Silhouette on the Moon
- Asteroid Donaldjohanson
- APOD: 2025 April 22 Á Terminator Moon: A Moonscape of Shadows