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XMM operational overheads are:
- Slew time to move to the target coordinates: variable, depending
on the relative target position with respect to the starting
spacecraft attitude; the XMM slew rate (except for the first
slew after perigee passage and the last slew before perigee
passage) is /h.
- AOCS reference star acquisition time and fine trim to the actual
target position after a slew - about half an hour per observation.
European Space Agency - XMM Science Operations Centre