3.3 HST Observing Efficiency
HST’s “observing efficiency” is defined as the fraction of the total time that is devoted to acquiring guide stars, acquiring astronomical targets, and exposing on them. The main factors that limit the observing efficiency are:
In recent cycles, the observing efficiency has been around 50%. Of the usable spacecraft time, about 80% is allocated to science observations, with the remainder devoted to calibration and engineering observations (10%), DD programs and repeats of failed observations (also 10%).
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