#
Signal-to-noise calculator for CCD photometry at WIYN 0.9m

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Michael Richmond

Aug 13, 2014

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.

Assumptions:

- WIYN 0.9-m telescope at Kitt Peak
- reflectivity of primary from 2012 measurements,
assumes reflectivity of secondary is the same
- standard Johnson-Cousins filters
- the star has the same spectrum as Vega, so it will give
inaccurate results for very cool, red stars.
- sky values for Kitt Peak, assuming 3-day moon
- extinction coefficients for Kitt Peak, from Direct Imaging manual

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.

Visitor number .

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Last updated Jun 12, 2013 by Michael Richmond.
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