Observing time calculator
Please go to this page for the new observing time calculator: http://www.apex-telescope.org/heterodyne/calculator/RMS calculator
Integration time calculator
By entering
the atmospheric temperature (some 10 degrees below the ground temperature at Chajnantor),
the (average) elevation of the source, the receiver temperature, an on-source integration time,
and the spectral resolution, the σ (in K) can be estimated. See the
observing time calculation page for details. The APEX-2a receiver
temperature is about 70 K for the entire tuning range.
By entering the
atmospheric temperature (some 10 degrees below the ground temperature at Chajnantor), the
(average) elevation of the source, the receiver temperature, required σ (in K), and
the spectral resolution, the on-source integration time can be estimated. Also the total
time is calculated assuming toff=ton and a system observing
efficiency of 0.625, i.e. ttotal=(ton + toff)/0.625. The
system efficiency takes into account time for telescope movements and calibrations.
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