Zwicky's Triplet (Arp 103) is a group of three galaxies visible in the constellation Hercules. None of the galaxies is listed in the New General Catalogue (NGC) or Index Catalogue (IC), but all three are identified in the Catalogue of Principal Galaxies (PGC) published in 1989.
Zwicky's Triplet (Arp 103) is a group of three galaxies visible in the constellation Hercules. None of the galaxies is listed in the New General Catalogue (NGC) or Index Catalogue (IC), but all three are identified in the Catalogue of Principal Galaxies (PGC) published in 1989.
Source: Wikipedia "Zwicky's Triplet" · CC BY-SA 4.0
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