CTIO Infrared Imager Exposure Time Calculator

Note: ISPI throughput values updated 12 March 2005.


Filter Imager




Telescope Source flux 

Flux Units:  Magnitudes Flambda (ergs/s/cm²/um)  Jansky
Aperture (pixel radius for photometry aperture, integer)


Desired S/N ratio


Exposure Time (seconds)
Calculate S/N for specified Total Integration Time
Calculate Total Integration Time to reach Desired S/N

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