Messier 1 The Crab Nebula in HOO.
"The Crab Nebula was the first astronomical object recognized as being connected to a supernova explosion.... Tracing the expansion back revealed that the nebula must have become visible on Earth about 900 years before. Historical records revealed that a new star bright enough to be seen in the daytime had been recorded in the same part of the sky by Chinese astronomers on 4 July 1054, and probably also by Japanese observers."
Skywatcher 300PDS 12" F5 Newtonian, modified NEQ6 Pro, ZWO ASI 183mm Pro, Svbony Ha and OIII 7nm filters, 206 minutes.
Full field at Astrobin --->
https://astrob.in/005dsw/0/
I'm really liking this 12", even though I've overloaded the NEQ6.