NGC 869 and NGC 884, the Double Cluster

About image

The Double Cluster of Perseus is a pair of very bright open clusters, visible in the homonymous constellation of Perseus; they are also known as h and χ Persei or NGC 869 and NGC 884.
Both clusters are found in the Arm of Perseus, the spiral arm of the Milky Way immediately outermost from ours, the Arm of Orion.
In the image shown here, NGC 869 is the cluster in the upper part, while NGC 884 is the one in the lower part; their distance is 6800 light years and 7600 light years respectively.

Technical data
Optic         Tecnosky Apo refractor LT 130-910 with Riccardi reducer 0.75x (focal lenght 692mm, f/5.3)
Mount       Skywatcher EQ8
Camera                      Moravian G3-16200 with external filter wheel 7 positions
Filters                         Baader 50mm unmounted RGB  
Guiding system         Artesky Ultraguide 70mm 
Exposure details    R 26x120" bin1 -20C

         G 26x120" bin1 -20C
            B 26x120" bin1 -20C
Total integration       2h36'
Acquisition                Voyager, PHD2
Processing                Pixinsight 1.8, Photoshop CS5, NoiseXTerminator
SQM-L                       18.5    
Location                    Rescaldina (Italy), home terrace
Date                          26 November 2022

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