M-91 (NGC-4548) is a face-on barred spiral galaxy located in the constellation of Coma Berenices. It is part of the Virgo cluster of galaxies. It lies 63 million light years from Earth and is 100,000 light years in diameter. It was discovered by Charles Messier in March of 1781, and added to his catalog as number 91.
This image, acquired on May 5, 2021, is a 40 minute integration of 4 minute exposures taken through the Celestron C-11 at f/2, using the HyperStar III imaging system and the ZWO ASI 071MC color CMOS camera operating at -10 degees below ambient temperature and binned 1 X 1. Guided, captured and combined using Maxim DL5 Pro. Post processed using PhotoShop CS2, Gradient XTerminator, StarShrink, Carboni's Astro Tools and NoiseWare.