Operational Challenges for FUSE Cycle 4 Science Planning

Details Operational Challenges for FUSE Cycle 4 Science Planning Operational Challenges for FUSE Cycle 4 Science Planning

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.4108c&link_type=abstract

American Astronomical Society, 201st AAS Meeting, #41.08; Bulletin of the American Astronomical Society, Vol. 34, p.1165

Astronomy and Astrophysics

Astronomy

Scientific paper

In late January 2002, three-axis control of the Far Ultraviolet Spectroscopic Explorer (FUSE) was regained after the failure of the second of its four momentum wheels almost two months earlier. The new attitude control system uses the two remaining wheels in combination with on-board magnetic torquer bars. Operations with this new system initially placed significant constraints on science observing, due to the complex interaction between geomagnetic and gravitationally-induced torques on the satellite structure. Over the following months, new and modified science planning software, improved guidance control software, and increased experience in spacecraft operations allowed us to reduce the effects of the majority of these constraints. We present the science mission planning aspects of observing with FUSE under these new conditions. Our emphases are what we have learned during the preceding year, and how we will apply those lessons to our long-range planning and short-term observation scheduling processes for Cycle 4 observations starting in early 2003. This work is supported by NASA Contract NAS5-32985 to The Johns Hopkins University.

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