Another nice project made with Olivier Désormières from the SADR Team (acquisition Arnaud Peel and Olivier Désormières, processing Arnaud Peel): a complete new version with new RGB in bin 1x1 this time: I tried to keep as much as possible the faint details in the Hapha globules and enhanced the spiralSo thanks a lot to Olivier for the acquisition of a great Luminance and RGB with the Sadr association setup , Newton 14'' in Chile.I select the best FWHM subs for the luminance.60s subs were made not to burn the center of the galaxy.Red 20 subs@300s -20°C bin 1 gain highBlue 20 subs@300s -20°C bin 1 gain highGreen 20 subs@300s -20°C bin 1 gain highLight 30 subs@60s -20°C, gain highLight 39 subs@300s -20°C, gain highLight 81 subs@600s -20°C, gain highHalpha 45 subs@300s -20°C, gain highTotal exposure : 26h05

Copyright: Arnaud Peel

Image Description and Details :

Taken in the South of France , near Ventoux mountain, Newton 300mm F4 with the ZWO ASI6200, mix SHO and RGB starsMosaic of 2 panels in SHO and RGB stars:178 Halpha subs @300s gain 100 and -15°C99 OIII subs @300s gain 100 and -15°C20 Blue subs @60s gain 100 and -15°C20 Green subs @60s gain 100 and -15°C20 Red subs @60s gain 100 and -15°CTotal exposure 24h05



Copyright: Arnaud Peel

Messier 81 (also known as NGC 3031 or Bode's Galaxy) is a grand design spiral galaxy about 12 million light-years away, with a diameter of 90,000 light years, about half the size of the Milky Way, in the constellation Ursa Major. Due to its proximity to Earth, large size, and active galactic nucleus (which harbors a 70 million M☉[5] supermassive black hole), Messier 81 has been studied extensively by professional astronomers. The galaxy's large size and relatively high brightness also makes it a popular target for amateur astronomers.