Cassini Swaps Thrusters

March 12, 2009
Artist concept of Cassini spacecraft. Image credit: NASA/JPL

( -- Early this morning the Cassini spacecraft relayed information that it had successfully swapped to a backup set of propulsion thrusters late Wednesday.

The swap was performed because of degradation in the performance of the primary , which had been in use since Cassini's in 1997. This is only the second time in Cassini's 11 years of flight that the engineering teams have gone to a .

The thrusters are used for making small corrections to the spacecraft's course, for some attitude , and for making angular momentum adjustments in the reaction wheels, which also are used for attitude control. The redundant set is an identical set of eight thrusters. Almost all Cassini engineering subsystems have redundant .

Cassini has successfully completed its original four-year planned tour of Saturn and is now in extended mission operations.

Provided by NASA

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