M51 The Whirlpool

Distance: 31 million light-years

                                                                                                                

ASA Astrograph Reflector 12" f/3.62 / Losmandy HGM TITAN Gemini Go-To / SBIG ST-10XME / Astrodon LRGB & Hα
Exposures : Luminance (6 nights with Clear filter) = 17h29min.
RGB = 3 HR (1 hr for each frame)