In the new attitude control system, accounting for torque authority and reaction wheel momentum management, what is the typical length of a target “visit”?
While the reaction wheel momentum management introduces hysteresis into the FUSE mission planning and hence makes the implementation of any observation dependent on its predecessors, our experience so far shows that a “typical” maximum duration for a target “visit” falls in the range of 6-12 hours (i.e. 3-7 orbits), with some extending to 24 hours. Depending on whether the target is observed in the CVZ or not, this corresponds to about 6-40 ksec (or possibly more). There are occasional transient disturbances during these periods, so some of this time might not be useful.
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