Vesta
Vesta is the second most massive body in the asteroid belt, surpassed only by Ceres, which is classified as a dwarf planet.
Vesta, goddess of the hearth, and sister to Ceres. NASA link
NASA's Dawn spacecraft, which visited the asteroid in 2012, discovered that the rocky body had a surprising amount of hydrogen on its surface.
Diameter: 329 miles (530 kilometers)
Mass: 5.886 X 1020 lbs. (2.67 x 1020 kilograms)
Temperature: 85 to 255 K (minus 306 to 0 degrees Fahrenheit / minus 188 to minus 18 degrees Celsius)
Albedo: 0.4322
Rotation period: 5.342 hours
Orbital period: 3.63 years
Eccentricity: .0886
Aphelion: 2.57 AU
Perihelion: 2.15 AU
Closest approach to Earth: 1.14 AU
A massive mountain towers over Vesta's southern pole. The enormous mountain reaches up over 65,000 feet (20 kilometers) in height, making it nearly as tall as Olympus Mons, the largest mountain (and volcano) in the solar system. Olympus Mons soars about 15 miles (24 kilometers) above the surface of Mars.