NGC 2158

About image
NGC 2158 is an open cluster in the constellation Gemini, half a degree away from the better known M 35. Its components are rather weak, around the twelfth magnitude.
The low luminosity of this cluster is justified by the great distance at which it is located, over 16,000 light years, that is on the outskirts of the Milky Way, on the Cygnus arm; therefore it also appears strongly obscured by interstellar dust which stands in the line of sight.

Technical data
Optic          Celestron C9.25 Edge HD f/10
Mount        Losmandy G11 with Ovision worm and FS2
Camera         Atik 4000 with Starlight Xpress filter wheel 5 positions
Filters         Baader RGB 50.8 unmounted
Guiding system    OAG LB Astro Proxima with Lodestar
Exposure details  R 10x300" bin1 -20C
           G 10x300" bin1 -20C
           B 10x300" bin1 -20C
Total integration   2.5h
Acquisition      Maxim, PHD2
Processing      Maxim, Photoshop CS5
SQM-L        21.0     
Location       Pian dell'Armà (Pavia, Italy)
Date           24 October 2014

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