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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.
Most known asteroids are found in the Main Belt between Mars and Jupiter, or in the Kuiper Belt past the orbit of Neptune. But there are thousands that orbit at least as close to the Sun as Earth.The vast majority of asteroids are smaller than 1 kilometer in diameter. The largest asteroid in the Main Belt is Ceres, which has been designated a dwarf planet. simple way which works for orbits with a small eccentricity, like most of the planets, is to find the maximum and minimum distance from the sun. If we call the distances Dma â¦ x and Dmin, the eccentricity is given by this formula: e = (Dmax-Dmin) / (Dmax + Dmin).