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How we refer to objects is probably more a function of the list we used to find them in the first place. I personally don't know many of the NGC numbers of the Messier Objects because I started my Deep Sky observing with the Messier list. Fortuneately the Caldwell List is well known and if somebody uses C56 for example, you can readily find out what it is. But something like K30, "K" for Ed's Southern Gems Deep Sky Objects between -34 and -45 Dec visible from Texas List, is definitely NOT a good choice of catalogs to quote.
Clear, dark skies
Ed K (Author of the extremely obscure K Catalog!)
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