Deep Space 1, launched October 24, 1998, encountered asteroid 9969 Braille and comet 19P/Borrelly. It was intended to fly by Comet 79P/West-Kohoutek-Ikemura and asteroid 3352 McAuliffe, but a delayed launch and a brief engine failure forced NASA to change Deep Space 1's objectives.
It encountered Comet 9969 Braille on July 29, 1999 and flew by Comet 19P/Borrelly on September 22, 2001.
NASA shut its engines down in December 2001. Attempts to resume contact in March 2002 were unsuccessful. Deep Space 1 remains in a heliocentric orbit.
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