Galaxyman,
Quote:
I note that many amateur images of various HII regions were used in "Handbook of Star Forming Regions", a superheavyweight "professionals" guide to nebulae and gas/dust clouds in our Galaxy. Obviously, the amateur images were the best available for the objects in question!
(this book is characterized in my recent post in the "Science" forum entitled "Our Galaxy - Some recent Resources)
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I doubt that those deep sky surveys put in the number of subframes & time -
including processing that
many amateurs do for one target. i.e.
Ha RGB= 150 50 50 50min RGB
It's a great wide field photo.