Signal to Noise Calculator for CCD Photometry

Allows you to calculate the signal-to-noise ratio for a star observed with a telescope and CCD over a range of magnitudes with a defined magnitude step.

This is an Flask app. The apps main code is signal_to_noise.py. The templates required as stored in the templates directory and the css file is stored in the static directory.

All the functions required to perform the calculations can be found in functions.py. This module can be imported and used with out creating the Flask app. E.g.

import functions
results = functions.signal_to_noise(filter_name='V', mag_start=8.0, mag_end=9.0, dmag=0.5,
                                    tel_diam=10, qe=0.5, readnoise=10, pixsize=3, skymag=17,
                                    airmass=1.2, exptime=20.0, fwhm=6, aper_rad=8, gain=1.0,
                                    obs_diam=5.0, sat_level=60000)
for r in results:
    print r

Magnitude=8.0  star_adu=256108.292  sky_adu=16255.446  read_adu=2234.021  signal_to_noise=488.737
    saturated=False
Magnitude=8.5  star_adu=161593.408  sky_adu=16255.446  read_adu=2234.021  signal_to_noise=380.792
    saturated=False
Magnitude=9.0  star_adu=101958.548  sky_adu=16255.446  read_adu=2234.021  signal_to_noise=293.781
    saturated=False