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Asteroids can reach as large as Ceres, which is 940 km (about 583 miles) across. On the other hand, one of the smallest, discovered in 1991 and named 1991 BA, is only about 20 feet (6 meters) across. Nearly all asteroids are irregularly shaped, although a few are nearly spherical, such as Ceres.
Ceres is the largest asteroid by far. It is 590 miles in diameter, about one-fourth the size of the moon, and is composed of rock and ice. The orbit of Ceres is nearly circular at an average distance of 257 million miles from the sun, giving it a 4.6-year orbital period.