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NASA Comet Nucleus Tour ("CONTOUR") Probe Goes Missing

The CONTOUR probe was believed to have disintegrated during the rocket engine firing event that preceded loss of communications.
After the solid rocket motor intended to inject the spacecraft into solar orbit was ignited on August 15, 2002, contact with the probe could not be re-established. Ground-based telescopes later found three objects along the course of the satellite, leading to the speculation that it had disintegrated. Attempts to contact the probe were ended on December 20, 2002.
https://en.wikipedia.org/wiki/CONTOUR
 
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