This form calculates the Signal to Noise Ratio (SNR) for aperture photometry of a point source. The SNR is calculated for filtered or clear observations using the properties of the sensor (CCD), instrument (telescope and filter), and the observation. Use this calculator to plan observations by estimating the effect of exposure time and other parameters. You also can work backward to determine what combination of parameters gives a target SNR (also see the Optimizer tool). Click [Save] to save your parameters for next time. Click [Load] to fetch them. Comments
Enter your values into the form and click [Calculate].