NASA spacecraft is orbiting massive asteroid

The space agency’s Jet Propulsion Laboratory said Monday the capture was estimated to have occurred at 10 p.m. PDT (0500 GMT) Friday when Dawn was 9,900 miles (15,930 kilometers) from Vesta and 117 million miles (188 million kilometers) from Earth in the main asteroid belt between Mars and Jupiter.
Mission principal investigator Christopher Russell says it’s the beginning of a study of what is arguably the oldest existing primordial surface in the solar system.
The spacecraft will study Vesta for a year and then continue on to the most massive object in the main asteroid belt, the “dwarf planet” Ceres. That encounter is scheduled to occur in February 2015.