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Also known as h and χ Persei, the Double Cluster (comprising NGC 869 and NGC 884) is a "line of sight" pairing in the constellation in Perseus, though actually they are only a few hundred light years apart. The clusters have a combined visual magnitude of 3.7 and 3.8 and are visible to the naked eye as a fuzzy patch between Perseus and Cassiopeia.
NGC 869 (top) has a mass of 3700 solar masses and NGC 884 weighs in at 2800 solar masses; the total mass for the complex is estimated in excess of 20,000 solar masses when including an extensive halo of stars. Based on their individual stars, the clusters are relatively young, both 12.8 million years old, with the hottest stars having spectral class B0; NGC884 also has 5 prominent red supergiants including variable RS Per (closest to the centre of the lower cluster). North is to the left in this view.
Skywatcher Esprit ED80
SBIG STF8300M + Baader filters
RGB (125m:115m:115m - all in 300s subs., with additional 25x15sec in each channel for bright star cores)
Taken remotely from E-EYE in Spain:
* Image capture: Graeme Coates & Paul Tribe
* Processing: Graeme Coates
Bonus points for spotting the small fuzz of a galaxy in the field 😉
Location: Eversley, United Kingdom
Date: 17 November 2018
TS Optics 60ED refractor, with 0.79x reducer on Celestron AVX mount
Imaging camera: ZWO 1600mm camera with ZWO LRGB filters
Guide camera: ZWO 120mc-s on ZWO mini guidescope
Image details: Image is constituted of the under:
18 no, Luminance x 5 min
10 no. Red x 5 min
10 no. Green x 5 min
3 no. Blue x 5 min (Target went behind trees)
Processed in Pixinsight