The Pinwheel Galaxy (also known as Messier 101 or NGC 5457) is a face-on spiral galaxy 21 million light-years away from Earth in the constellation Ursa Major. It was discovered by Pierre Méchain in 1781 and was communicated that year to Charles Messier, who verified its position for inclusion in the Messier Catalogue as one of its final entries.
Details
2022-08-16 and 17
2.5" OGS scope on Paramount ME mount. QHY 600ph camera with Optical flattener. QHY guide camera.
Exposures - 240s for 8 L, 9 G, 6 B and 7 R subs. Dark, flat and bias frames for calibration. Processing in Pixinsite and Photoshop.