The death throws of stars can be a beautiful process. Emission nebula NGC 6164 was created by a rare, hot, luminous O-type star, some 40 times as massive as the Sun. 4 light years across and 4200 light years away.
GSO 10" F4 Newtonian, ZWO ASI 183mm Pro at -10C, Bi-colour, Ha 256m, OIII 421m with Svbony 7nm narrow band filters, total 11.3 hours. Could have done with 50+ hours, but I don't have the patience.
Stretched to an inch of it's life but that's the way I am. If it isn't bleeding I haven't pushed it enough.
Bigger at Astrobin --->
https://astrob.in/qez3m4/B/