M 81

Messier 81

M 81 what is there to say big, bright about 12 million light years away in Ursa Major. Several obvious Ha lines run through the spiral arms, several big dark dust lanes. Holmberg IX is a dwarf irregular galaxy and a satellite galaxy of M81. Holmberg IX is the bluish irregular at lower image. Harder to see but present on lower left is some IFN (dust illuminated by our galaxies light) Taken using an 8 inch RC telescope unguided at f/8 (1600 mm) using MyT mount and a QSI 683 mono CCD. Exposure times 7 hours on Luminance, 2 hrs each RGB channel and 6 hours on HA