Does WISE have some propellant to help position itself in a precise orbit?
No, WISE will have no propellant aboard. It is placed into orbit by the launch rocket and then will make all pointing adjustments using reaction wheels and torque rods, in combination with star trackers, sun sensors, a magnetometer, and gyroscopes. (Note: the reaction wheels and torque rods maneuver the spacecraft, the rest are sensing elements).
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