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Mars Express
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=== Attitude control - avionics === Attitude control (3-axis stabilization) is achieved using two 3-axis inertial measurement units, a set of two [[star camera]]s and two [[Sun sensor]]s, [[gyroscope]]s, [[accelerometer]]s, and four 12 N·m·s [[reaction wheel]]s. Pointing accuracy is 0.04 degree with respect to the inertial reference frame and 0.8 degree with respect to the Mars orbital frame. Three on-board systems help ''Mars Express'' maintain a very precise pointing accuracy, which is essential to allow the spacecraft to use some of the science instruments.
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