[R] How do I find the apparent magnitude of a galaxy from a FITS file?

[andrej]

Greetings!
I am still new to R but have been asked to look at doing astronomy with R.
I have a FITS file which contains an optical telescope image (it can be
viewed in SAOimageDS9).
I need to estimate the magnitude of a galaxy... and eventually other optical
sources.

How do I find the apparent magnitude of a galaxy from a FITS file?



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