Signal-to-noise calculations in photometry
See this link.
In short,
In short,
![](http://spiff.rit.edu/classes/phys445/lectures/signal/eqn_ccd_signoise.png)
- N(star) is the number of electrons from the star which fall within the aperture
- N(backpp) is the number of electrons Per Pixel
- N(thermpp) is the number of electrons Per Pixel
- R is the readout noise per pixel, in electrons
- npix is the number of pixels in the aperture
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