951 Gaspra

951 Gaspra ( /ˈɡæsprə/) is an S-type asteroid that orbits very close to the inner edge of the asteroid belt. Gaspra was the first asteroid ever to be closely approached when it was visited by the Galileo spacecraft, which flew by on its way to Jupiter on 29 October 1991.

Read more about 951 Gaspra:  Characteristics, Exploration