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Ceres
Diameter: 590 miles (950 km)
Discovered in 1801, 1 Ceres is the largest and most massive of the asteroids in our Solar System, with an estimated diameter of 590 miles (950 km) and a mass of 9.5 x 10^20 kg. It is the only dwarf planet in the asteroid belt and is the only object in the belt that is known to be round due to its own gravity. 1 Ceres is composed mostly of rock and ice, with an outer layer of dark material that may be organic compounds. Its surface is heavily cratered, with some areas of bright material, likely due to ice or salts. It is believed to have an icy mantle and possibly an internal ocean beneath its surface.
