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Contains:  NGC 884, Double cluster, NGC 869, The star 7Per
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Double Cluster NGC884, NGC869, 


            Thomas Richter
Double Cluster NGC884, NGC869

Double Cluster NGC884, NGC869

Technical card

Resolution: 5423x3599

Dates:Oct. 10, 2018

Baader B 1.25'' CCD Filter: 84x60" (gain: 53.00) -20C bin 1x1
Baader G 1.25'' CCD Filter: 84x60" (gain: 53.00) -20C bin 1x1
Baader R 1.25'' CCD Filter: 84x60" (gain: 53.00) -20C bin 1x1

Integration: 4.2 hours

Darks: ~31

Flats: ~27

Avg. Moon age: 1.43 days

Avg. Moon phase: 2.31% job: 2304993

RA center: 2h 20' 30"

DEC center: +57° 7' 44"

Pixel scale: 1.199 arcsec/pixel

Orientation: 3.160 degrees

Field radius: 1.084

Locations: Nürnberg, Nürnberg, Bayern, Germany

Data source: Backyard


Object description (

The Double Cluster (also known as Caldwell 14) is the common name for the open clusters NGC 869 and NGC 884 (often designated h Persei and χ Persei, respectively), which are close together in the constellation Perseus. Both visible with the naked eye, NGC 869 and NGC 884 lie at a distance of 7500 light years. NGC 869 has a mass of 3700 solar masses and NGC 884 weighs in at 2800 solar masses; however, later research has shown both clusters are surrounded with a very extensive halo of stars, with a total mass for the complex of at least 20,000 solar masses. Based on their individual stars, the clusters are relatively young, both 12.8 million years old. In comparison, the Pleiades have an estimated age ranging from 75 million years to 150 million years. There are more than 300 blue-white super-giant stars in each of the clusters. The clusters are also blueshifted, with NGC 869 approaching Earth at a speed of 39 km/s (24 mi/s) and NGC 884 approaching at a similar speed of 38 km/s (24 mi/s).[5] Their hottest main sequence stars are of spectral type B0.



Thomas Richter
License: None (All rights reserved)

Sky plot

Sky plot


Double Cluster NGC884, NGC869, 


            Thomas Richter