Overview: Helps you understand what these catalogs are, how they came about, how to use them effectively, and why it is a good idea to compare them to each other..Allows for the creation of a personalized obser.Every amateur astronomer has at least heard of the many different catalogs of deep-sky objects; the most well known are the Messier, the Caldwell, the Herschel, and the NGC. All of these catalogs are, in general, readily available, but very few amateur observers are in a position to choose the best catalog for their particular deep-sky observing program, know how to use the catalog, or
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