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Galileo became the first spacecraft to visit an asteroid when it made a flyby of 951 Gaspra.
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Galileo (spacecraft)
First NASA mission to orbit Jupiter (1989–2003)
Galileo was an American robotic space probe that studied the planet Jupiter and its moons, as well as the asteroids Gaspra and Ida. Named after the Italian astronomer Galileo Galilei, it consisted of an orbiter and an entry probe. It was delivered into Earth orbit on October 18,…Source: Wikipedia (CC BY-SA)
Asteroid
Minor planets found within the inner Solar System
An asteroid is a minor planet—an object larger than a meteoroid that is neither a planet nor an identified comet—that orbits within the inner Solar System or is co-orbital with Jupiter. Asteroids are rocky, metallic, or icy bodies with no atmosphere, and are broadly classified…Source: Wikipedia (CC BY-SA)
951 Gaspra
S-type asteroid in the inner asteroid belt
951 Gaspra is an S-type asteroid that orbits very close to the inner edge of the asteroid belt. Gaspra was discovered by Russian astronomer G. N. Neujmin in 1916. Neujmin named it after Gaspra, a Black Sea retreat that was visited by his contemporaries, such as Gorky and Tolstoy.Source: Wikipedia (CC BY-SA)