Astronomy and Astrophysics – Astronomy
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...200.1906b&link_type=abstract
American Astronomical Society, 200th AAS Meeting, #19.06; Bulletin of the American Astronomical Society, Vol. 34, p.672
Astronomy and Astrophysics
Astronomy
Scientific paper
In late January, 2002, the Far Ultraviolet Spectroscopic Explorer (FUSE) satellite resumed scientific operations under slewing and guiding control with its two remaining reaction wheels and three magnetic torquer bars. This new control scheme requires the development of algorithms in the scheduling system that take into account the orientation of the geomagnetic field during observations and the effects of the gravity gradient torque with time. Both gravity gradient disturbances and magnetic torque authority vary on orbital, diurnal, and precessional cycle time scales, yielding complex and constantly changing constraints for scheduling. New software tools have been developed to determine stable areas of the sky, define the optimum direction and time for slewing, and assist in long-range planning and short-term scheduling of scientific observations. We present an overview of some of these tools and procedures. This work is supported by NASA Contract NAS5-32985 to the Johns Hopkins University.
Ake Thomas B.
Berman Alice F.
Blair William Patrick
Calvani Humberto M.
FUSE Operations Team
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