The DS1
mission was
terminated at 1:00:09 pm
PST, December 18 2001. The
ion drive had been in use for 677 days, and had expended 90% of the
xenon it carried at launch. The mission had been been successfully extended to collect data from the comet
Borrelly, but plans to further extend the mission to rendezvous in
August 2002 with the
asteroid named 1999 KK1 were not pursued due to limits on resources and finances.
Sources: Adios In Deep Space, by Marc D. Rayman,Mission Manager DS1, Pasadena - SpaceDaily.com Dec 18, 2001