The dwarf planet Ceres is by far the largest asteroid, a diameter of 940km (580 mi). The next largest are 4 Vesta and 2 Pallas, both with diameters of just over 500 km (300 mi).
An asteroid is a minor planet of the inner Solar System. Sizes and shapes of asteroids vary significantly, ranging from 1-meter rocks to dwarf planets almost 1000 km in diameter, they are metallic or rocky bodies with no atmosphere. Of the roughly one million known asteroids the greatest number of them are located between the orbits of Mars and Jupiter, approximately 2 to 4 AU from the Sun, in the main asteroid belt.
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