Landing early 2001 Launch autumn 2000 Flight acceptance review launch 3 months Testing and launch-vehicle integration launch 9 months (mid-1999) Spacecraft integration Jan. 1999 to mid-1999 Software development mid-1997 to end-1998 Equipment procurement mid-1997 to end-1998 Critical design approval mid-1998 Preliminary design approval mid-1997 (incl. go/no-go decision) Mechanical test beds mid-1997 to end-1998 Simulators Jan. 1997 to launch+mission System design 1997 Source search to mid-1998