Explanation: This asteroid has a moon. The robot spacecraft Galileo on route to Jupiter in 1993 encountered and photographed two asteroids during its long interplanetary voyage. The second minor planet it photographed, 243 Ida, was unexpectedly discovered to have a moon. The tiny moon, Dactyl, is only about 1.6 kilometers across and seen as a small dot on the right of the sharpened featured image. In contrast, the 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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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.

Publikacii s klyuchevymi slovami: Ida - Dactyl - asteroid - Ida - asteroidy Publikacii so slovami: Ida - Dactyl - asteroid - Ida - asteroidy
Sm. takzhe: Faeton i ego potomstvo Voshod sputnika Dinkinesha Vozvrashenie s Bennu Prikosnuvshis' k Bennu Orbity potencial'no opasnyh asteroidov Stereo-Bennu Kosmicheskii apparat DART protiv Dimorfa Vse publikacii na tu zhe temu >>