But the Dawn mission has a risen-from-the-dead story to tell as well. Little more than a year ago, the program was canceled outright by Mary Cleave, then NASA's associate administrator for science. The project was over budget and had a slew of unresolved technical issues, but the hardware was 98% complete. Cleave's decision angered the planetary-science community and its Congressional allies so much that the space agency soon rescinded the cancellation. Cleave has since retired from NASA.
Monday's liftoff is scheduled for 3:56 p.m. EDT. Project managers have avoided saying just how many more days remain in this particular launch "window," though if Dawn doesn't launch soon it'll need to vacate the pad until September to make way for Phoenix. (The launch, originally slated for June 30th, has already been delayed three times.)
If everything goes well, a souped-up Delta rocket will boost the craft to escape velocity. After that a high-performance xenon-ion engine will push it onward toward a rendezvous with the asteroid Vesta in 2011 and then with Ceres in 2015.