NGC 5455

NGC 5455 is an emission nebula (HII region) located in Messier 101 (the Pinwheel Galaxy) towards the constellation Ursa Major. Eight other regions of Messier 101 are listed in the New General Catalogue, namely NGC 5447, NGC 5449, NGC 5450, NGC 5451, NGC 5453, NGC 5458, NGC 5461 and NGC 5462. Three of these regions were discovered by William Herschel (NGC 5447, NGC 5461 and NGC 5462) and the other six by Bindon Stoney.