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H.M. Hart, T.B. Ake (JHU/CSC), D.J. Christian, B.A. Roberts, J.W. Kruk, W.P. Blair, H.W. Moos (JHU), the FUSE Operations Team
Since late-January 2002, the Far Ultraviolet Spectroscopic Explorer (FUSE) satellite has employed two non-orthogonal reaction wheels and a set of magnetic torquer bars for attitude control. The change in control method has modified the execution of slews and static pointing, which in turn affects target acquisitions and maintenance of pointing control during science exposures. Motions around two axes are well-controlled, but large maneuvers around the axis controlled by the geomagnetic field can have larger errors and can take longer to complete. Once a slew has settled, however, the positional accuracy is as good as with the previous four wheel control law. For static pointing, the variations are small enough that full spectrograph resolution can be achieved. Routine monitoring of the in-orbit performance of slews and static pointing is providing the data necessary to develop and improve attitude control algorithms and mission planning.
This work is supported by NASA Contract NAS5-32985 to the Johns Hopkins University.
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Bulletin of the American Astronomical Society, 34
© 2002. The American Astronomical Soceity.