Re: [APML] Sky fog

[Aplanatic@aol.com]

Hi Rick:

Your procedure is correct, but it's better if you find and measure a sequence of stars of increasing lower brightness and plot the sequence of measured values against their accepted magnitudes.  This will allow you to plot a (hopefully) straight line through the data for extrapolation to the sky background.

The problem with unfiltered exposures is that you will have to correct for star color, I think, based on the QE curve of your detector (if you want to do this as accurately as possible).  I don't know how to do this without some research, perhaps Tom Krajci does.

Dave Rowe

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