Asteroid Vesta Meteorite

Vesta is the second-most-massive and probably the second-largest asteroid, after the dwarf planet Ceres, and contributes an estimated 9% of the mass of the asteroid belt.
It is probably slightly larger than Pallas, but is about 25% more massive. Vesta is the only known remaining rocky protoplanet (with a differentiated interior) of the kind that formed the terrestrial planets. Numerous fragments of Vesta were ejected by collisions one and two billion years ago that left two enormous craters occupying much of Vesta’s southern hemisphere. Debris from these events has fallen to Earth as howardite–eucrite–diogenite (HED) meteorites, which have been a rich source of information about Vesta.