How Big Are Asteroids?

Answer

The biggest asteroid known is 1 Ceres. It has a diameter of about 600 miles, which is almost 1/3 the size of the moon. 1 Ceres was discovered by Giuseppe Piazzi on, January 1, 1801. 2 Pallas, the 2nd largest, 3 Juno, the 3rd discovered, and 4 Vesta, the 3rd largest, were discovered in the next few years. The top 4 asteroids size wise would be, Ceres, Pallas, Vesta and 10 Hygiea.
2 Additional Answers
The largest known Asteroid is 1,003 kilometers across, but many of them are not even one km across. They are larger that boulders, but smaller than planets. You can find more information here: http://www.associatedcontent.com/article/2254687/how_big_are_asteroids.html?cat=58
Asteroids vary in size. One of the smallest asteroid, named 1991 BA, is 20 feet across. The largest asteroid, Ceres (discovered in 1801) is 580 miles in diameter. The asteroid 1991 BA was discovered in 1991. You can find more information here: http://www.optcorp.com/edu/articleDetailEDU.aspx?aid=1064
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The asteroid apophis is 2.3 times bigger than the Earth. Thanks for asking ChaCha!
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The asteroid belt is about 111 million miles wide, and lies between the orbits of the planets Mars and Jupiter. At some points, it's as close as 387 million km ...
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