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5.3.3 Observing Mode: Bright Object
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For very bright objects, where the estimated on-source exposure time per map position is 10 s or less, the total observing time is dominated by telescope moves. The efficiency of mapping such bright objects can be improved by observing two map positions and one off-position per nod-cycle using an asymmetric chop. In this mode, the total overhead is 5 N ton + 300 s assuming an on-source exposure times per map position of about 5 s.