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