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50px-Crystal_Project_Documentinfo.png This file was made from APOD.

Astronomy Picture of the Day
2004 June 19
Ida and Dactyl: Asteroid and Moon
Credit: Galileo Project, JPL, NASA

Explanation: This asteroid has a moon! The robot spacecraft Galileo destined to explore the Jovian system, encountered and photographed two asteroids during its long interplanetary voyage 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 image from 1993. 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 from Greek mythology. Many other asteroids are now known to have moons.

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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
NASA Technical Rep.: Jay Norris. Specific rights apply.
A service of: LHEA at NASA/ GSFC
& Michigan Tech. U.

Licensing Edit

This file is copyrighted. The copyright holder has given permission for its use.

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current06:52, February 3, 2014Thumbnail for version as of 06:52, February 3, 2014618 × 399 (50 KB)Jcpag2010 (wall | contribs)replace color

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