I have fit images of binary systems and want a program that will help determine which ones are highest quality, the seeing. The simplest way is apparently to equate it to the FWHM of the Gaussian of the point spread function of one of the stars. But I'm at a loss as to how to do this. I've searched for any helpful tutorials online but can't find an understandable method.

  • $\begingroup$ Do you mean FITS images? Are you familiar with software enough to take image data and extract slices? BTW, You might find what you need built-in to ImageJ , which is freeware $\endgroup$ – Carl Witthoft Apr 29 '19 at 15:38

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