Signal-to-noise calculations in photometry

See this link.

In short,



  • 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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