New Photos From NASA's Dawn Spacecraft of Asteroid Vesta

Rheasilvia impact basin is 310 miles in diameter.

NASA's Dawn spacecraft continues to do spectacular science on it's mission to first off, study asteroid Vesta.

From the Daily Galaxy Blog

• Vesta is one of the brightest objects in the solar system and the only asteroid in the ... main (asteroid) belt between Mars and Jupiter visible to the naked eye from Earth.

From NASA:

• Dawn has found that some areas on Vesta can be nearly twice as bright as others, revealing clues about the asteroid's history.

From Wikipedia

• Vesta, is one of the largest asteroids, with a mean diameter of about 330 miles is the second-most-massive asteroid after the dwarf planet Ceres, and comprises an estimated 9% of the mass of the asteroid belt. Vesta is thought to be a remnant protoplanet.   It lost some 1% of its mass less than a billion years ago in a collision that left an enormous crater occupying much of its southern hemisphere. Debris from this event has (even) fallen to Earth . 

Lots of great info and pics on all the sites.  enjoy