| 21. | An engineering report was ordered to assess the spacecraft's capabilities, its two good reaction wheels and its thrusters.
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| 22. | The JWST telescope still has spinning reaction wheels, which can be adjusted to point the telescope without using propellant.
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| 23. | Other navigation and orientation systems on board CXO include an aspect camera, Earth and Sun sensors, and reaction wheels.
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| 24. | On August 15, 2013, NASA announced that they had given up trying to fix the two failed reaction wheels.
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| 25. | The spacecraft bus has two star trackers, six reaction wheels, and the propulsion systems ( fuel tank and thrusters ).
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| 26. | Additionally, new software was uploaded which would allow " Rosetta " to function with only two active reaction wheels if necessary.
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| 27. | Four reaction wheels ( arranged so that any three can provide complete three-axis control ) were used for normal attitude control.
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| 28. | The thrusters were used to dump angular momentum from the reaction wheels, as well as for rapid slew and propulsive maneuvers.
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| 29. | It consists of a rate gyro, reaction wheels, a precision pointing payload, and a scanning and pointing payload that produces motion disturbances.
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| 30. | It was reactivated in December 2001 for evaluation of its imager and reaction wheels, after which it was placed back into storage.
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