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Loading contentA catalogue of 12,921 galaxies north of declination −02°30′, compiled by Peter Nilson at Uppsala from the Palomar Sky Survey. Selected mainly by apparent size, it was for decades the most complete catalogue of nearby northern galaxies and remains a common cross-reference; objects carry a 'UGC' number.
Facts on this topic will be cited from these primary and reference sources.
Official naming, definitions, constellation boundaries, and astronomical nomenclature.