NASA's Dawn spacecraft has returned the first close-up images after beginning its orbit around the giant asteroid Vesta. On Friday, July 15, 2011, Dawn became the first probe to enter orbit around an object in the main asteroid belt between Mars and Jupiter. Vesta is 330 miles (530 kilometers) in diameter and the second most massive object in the asteroid belt. Ground- and space-based telescopes have obtained images of Vesta for about two centuries, but they have not been able to see much detail on its surface until now. Dawn will spend one year orbiting Vesta, then travel to a second destination, the dwarf planet Ceres, arriving in February 2015.