NGC 869/884, 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          TS Optics 76 EDPH - Aperture 76mm, focal lenght 342mm, f/4.5
Mount        Skywatcher EQ6R
Camera         ZWO ASI 294MM Pro with external filter wheel 7 positions
Filters         Antlia 36mm RGB
Guiding system    Artesky Ultraguide 32mm
Exposure details     R 20x120" bin2 -15C
                                    G 20x120" bin2 -15C
                                    B 20x120" bin2 -15C

          Gain 120, offset 30 

Total integration  2h
Acquisition      Voyager, PHD2
Processing      Pixinsight 1.8, Photoshop CS5
SQM-L       21.2    
Location       Promiod (Aosta Valley, Italy)
Date           7 November 2021

© Roberto Marinoni 2019 - All rights reserved