This form allows you to calculate the signal-to-noise ratio for a star observed with the WIYN 0.9-m telescope. You can vary the parameters and find out what sort of results to expect.
If you want to see the calculations themselves, try reading the Perl source code to the calculator. Or, if you just want to see the equations governing the calculations, try this article by Steve Howell.
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Last updated Jun 12, 2013 by Michael Richmond.