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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.
Asteroid Belt. The asteroid belt is situated between the orbits of Mars and Jupiter around 280 million miles (450 million km) from the sun. There are millions of asteroids residing in this area ranging from 600 miles (950 km) in diameter, all the way down to particles of dust.steroid Belt Facts. 1  There are 200 objects in the asteroid belt larger than 60 miles (100 km) in diameter and almost 1 million objects over 1 km in diameter. 2  The average surface temperature of an asteroid is -73C (-100F).