Another way to find out sizes, positions, magnitude etc is to use a star chart programme. I use Cartes du Ciel, which is a freebie. It's a bit messy and clunky, but can produce a nice clear accurate star chart that can be printed off and used outside. Good enough for me. When you click on an object's name, a dialogue box appears with all the info on it. A lot of observers use and recommend Stellarium and apparently the latest version is pretty good. It may have the same features.
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