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How does one find the extinction coefficient of a particular galaxy?

I am doing photometry on a number of objects in a number of different galaxies. I need the extinction coefficients for these galaxies for various filters passes. Is there some database that displays ...
0
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35 views

Tonight sky - deep sky objects

programmatically how can i get the list of Deep sky objects that will transit the meridian in my Latitude and longitude? Any online API?