4 Vesta

4 Vesta is the second most massive object in the asteroid belt, with a mean diameter of about 530 km and an estimated mass of 9% of the mass of the entire asteroid belt. It was discovered by the German astronomer Heinrich Wilhelm Olbers on March 29, 1807, and named after the Roman virgin goddess of home and hearth, Vesta. Vesta lost some 1% of its mass in a collision less than one billion years ago. Many fragments of this event have fallen to Ear... more
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