NASA’s Clementine lunar orbiter, its moon mapping mission complete, is directed to fire its engines to put it on a trajectory for asteroid 1620 Geographos, a near-Earth asteroid named for the National Geographic Society (which sponsored a sky survey that led to its discovery). But one of Clementine’s thrusters stays on too long, firing for 11 minutes and revving the vehicle up to an unrecoverable spin of 80 revolutions per minute, exhausting its entire fuel supply in the process. Clementine’s secondary mission to Geographos is abandoned, and its batteries are exhausted a month later.
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