Above: Planetoid (or asteroid) Ida with the newly discovered
moon. The moon was named Dactyl.
Ida is about 30 km and the moon 1 km in diameter. (NASA: Idamoon.gif)
Under: Gaspra is an irregular body with dimensions about 19 x 12
x 11 kilometers.
(NASA: Gaspra.gif)
The portion illuminated in this view is about 18 kilometers (11
miles) from lower left to upper right.
(Source: NASA.)