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Messier 51 - Whirlpool galaxy

Technical card

Resolution: 1587x1151

Dates: March 7, 2018

Frames: ZWO LRGB Filters: 750x3" (gain: 0.88) -20C bin 1x1

Integration: 0.6 hours

Darks: ~100

Avg. Moon age: 20.33 days

Avg. Moon phase: 68.83%

Bortle Dark-Sky Scale: 4.00

Temperature: 2.00 job: 1961807

Locations: Home Observatory, Budy Dłutowskie , Pabianice, Poland


M51 is a spiral galaxy in Canes Venatici constellation.

One of the most beautiful galaxies in our sky. It's orientated in front to us so we can observe its beautiful spiral arms and structure details.
It is accompanied by a smaller lenticular galaxy NGC 5195 and has gravity connection with it. In the future,it will be absorbed by her greater companion.

M51 sizes in the sky is quite big 11' x 6'. Brightness around 9 mag makes it easily visible even in smaller telescopes (10 cm lens or 15 cm mirror).
Under a good sky, It should be visible with small binoculars 10x50

I've always wanted to make nice picture of this galaxy. Finally, I'm satisfied with the effect.

Seeing was medium - I'll try again in the future to hunt better detail :)

Exposure data:

L- 750 x 3,5 seconds
RGB- 100 x 5 seconds per channel
Composition LRGB
Newton 250/1250 on NEQ-6 + ASI 178 MM-C + Baader LRGB

Two versions - full and crop on the galaxy (photo is resize to 80 %)



Łukasz Sujka



Stars corrected - size and shape adjustment


stars adjustment - black circles around stars removal


more contrast and color


Messier 51 - Whirlpool galaxy, 


        Łukasz Sujka