![]() ![]() ![]() ![]() The flux that arrives at the telescope depends on the transparency of the sky.Absolute flux calibration requires that all the flux of both the object and the standard star has been collected. The fraction of the total flux of an object that is contained in the slit depends on the shape of the object, the width and orientation of the slit, and the seeing.In order to have a true absolute flux calibration several requirements need to be fulfilled:
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