4 Vesta

4 Vesta is the second most massive object in the asteroid belt, with a mean diameter of about 530 km (around 330 miles) and an estimated mass of 9% of the mass of the entire asteroid belt. Vesta lost some 1% of its mass in an impact less than one billion years ago. Many fragments of this impact have impacted Earth as HED meteorites, a rich source of evidence about the asteroid. Vesta is the brightest asteroid and its greatest distance from the Sun is only slightly more than the minimum distance of Ceres from the Sun.
See more at Wikipedia.org...