M 81 in Ursa Major 13th April 2020 @ 21:22 UT
A large impressive spiral with sweeping long arms. An amazing sight as the image built up.
Image: 15 seconds x 192 frames (2880 seconds total), gain 6579, bin 1x1, Raw 14, black level 99, camera temperature 9.5 deg C, 1 dark. Stacked in SharpCap Pro 3.2.6248.0. The image was stacked and adjusted in SharpCap. The image was scaled down and cropped in GIMP.
Equipment: Celestron CPC-800 at F5.9, Alt-Az mount, Altair Astro Hypercam 294C Pro Cooled (fan), Celestron Focuser, CPWI controlled remotely via Microsoft RDP and ASCOM.
Over processed in GIMP to bring out the detail.
Astrometry: M 81, 12 million light years distance.
First recorded by Charles Messier in 1781.