I’ve been at this hobby for almost 20 years now, but tonight marks a milestone in data capture. Tonight, I combined all the data over the last 4 years of Messier 51 (the Whirlpool Galaxy) into a single image. This data was captured start in 2015, and consisted of 10 minute exposures. This year I started capturing 20 minute exposures with the same mount, telescope and camera.
In total this image has over 24 hours worth of “integration time” – the total time for all the exposures added together, which is 77,987 seconds or 1,299 minutes, or 21.66 hours.
Click here for the full capture details.

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