RGB 72 66 72 min. ASA 16" RC f/8 ASA DDM 100 ZWO ASI 6200MM Pro
The Pinwheel Galaxy is a face-on spiral galaxy 21 million light years away from earth. It was discovered by Pierre Mechain in 1781. M 101 has a diameter of 170.000 light years and has around a trillion of stars, twice the number of our Milky Way. Its characteristic can be compared to the Andromeda Galaxy. M 101 has also a high population of HII regions.