M-51 " The Whirlpool Galaxy "(37 million lys)
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Equipment :

    - Losmandy HGM TITAN / Gemini Goto mount
    - Astro Systeme Austria 12" N f/3.8 Astrograph
    - SBIG ST-10XME at -25°C
    - SBIG CFW-8A
 

Accessories :

   - Astrodon™ 1:1:1 Tru-Balance™ LRGB Filters

Conditions :

    - Second Quarter and New Moon

Exposures : (Total : 17h29min. for the Luminance only on 6 nights)

    Luminance :

L=  (196exp. x 5 min) + (69exp. x 1min.)  all in binning 1x1
 

Color information :

R= G = B = 12 exp. x 5 min. (binning 1x1)