NGC 2158

About image 

NGC 2158 is an open cluster in the constellation Gemini with size 6' and magnitude 8.6.
It is easily identifiable because it is less than half a degree from the better known and brighter M 35.
Its scarce luminosity is justified by the great distance at which it is located, equal to over 16,000 light years, in a peripheral position in the Milky Way, on the arm of the Swan: therefore it also appears strongly obscured by the interstellar dust that interposes itself along the line of sight.
It is a very ancient cluster, with an estimated age of more than 1 billion years.

Technical data
Optic         GSO RC12 Truss - Aperture 304mm, focal lenght 2432mm, f/8
Mount       10Micron GM2000 HPSII
Camera        ZWO ASI 2600 MM Pro with filter wheel 7 positions
Filters        Astrodon Gen2 E-Serie Tru-Balance 50mm unmounted RGB  
Guiding system   ZWO OAG-L with guide camera ASI 174MM Mini
Exposure details    R 12x300" bin3 -15C
            G 12x300" bin3 -15C
          B 12x300" bin3 -15C
Total integration  3h
Acquisition      Voyager, PHD2
Processing      Pixinsight 1.8, Photoshop CS5, NoiseXTerminator, BlurXTerminator
SQM-L       20.2    
Location       Promiod (Aosta Valley, Italy), own remote observatory
Date           10 February 2023


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