The Dawn Spacecraft Launch ( 2007 )

September 27, 2007

Dawn, launched on September 27, 2007, is a robotic spacecraft being sent by NASA on a space exploration mission to the two most massive members of the asteroid belt: the asteroid Vesta and the dwarf planet Ceres. Dawn is scheduled to explore Vesta between 2011 and 2012, and Ceres in 2015. It will be the first spacecraft to visit either body.

Dawn is innovative in that it will be the first spacecraft to enter into orbit around a celestial body, study it, and then re-embark under powered flight to proceed to a second target. All previous multi-target study missions—such as the Voyager program—have involved rapid planetary flybys.

http://en.wikipedia.org/wiki/Dawn_(spacecraft)