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Contains:  Double cluster, NGC 869, NGC 884, The star 7Per, The star 8Per
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NGC 869 & NGC 884 - The Double Cluster, 


            Graeme Coates
NGC 869 & NGC 884 - The Double Cluster
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NGC 869 & NGC 884 - The Double Cluster

Technical card

Baader Planetarium B 36mm: 23x300" bin 1x1
Baader Planetarium G 36mm: 23x300" bin 1x1
Baader Planetarium R 36mm: 25x300" bin 1x1

Integration: 5.9 hours

Basic astrometry details job: 3053538

RA center: 2h 20' 35"

DEC center: +57° 9' 36"

Pixel scale: 2.709 arcsec/pixel

Orientation: 89.207 degrees

Field radius: 1.540 degrees

Resolution: 3276x2452

Locations: Entre Encinas y Estrellas, Fregenal de la Sierra, Extremadura, Spain

Data source: Own remote observatory

Remote source: e-EyE Extremadura


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 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).

Skywatcher Esprit ED80
SBIG STF8300M + Baader filters
MI-250 mount
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



Graeme Coates
License: None (All rights reserved)

Sky plot

Sky plot


NGC 869 & NGC 884 - The Double Cluster, 


            Graeme Coates

In these public groups

Entre Encinas y Estrellas (e-EyE)