The Pinwheel Galaxy (also known as Messier 101, M101 or NGC 5457) is a face-on spiral galaxy distanced 21 million light-years (six megaparsecs) away from Earth in the constellation Ursa Major. Discovered by Pierre Méchain on March 27, 1781, it was communicated to Charles Messier who verified its position for inclusion in the Messier Catalogue as one of its final entries.
M101 is a large galaxy, with a diameter of 170,000 light-years. By comparison, the Milky Way has a diameter of 100,000 light years. It has around a trillion stars, twice the number in the Milky Way. It has a disk mass on the order of 100 billion solar masses, along with a small central bulge of about 3 billion solar masses. Wikipedia
Imaging Data: Redone on Sept 14,2023
Provo, Utah
Bortle 5 sky
Date: April 24, 26, 28 and May 9 2020, March 1,2021, June 8,2021
Exposure = 60,120,300 sec for a total integration time of 21 hours 2 minutes
Binning = 1×1
Camera Temperature = -10 deg C
Camera = ZWO ASI294MC PRO in Hyperstar postition
Mount = 10Micron GM100HPS0
Filters = STC Astro Duo-Narrowband Filter & Astronomik UV-IP Blocking Filter