Hemisphere:  Northern  ·  Constellation: Perseus (Per)  ·  Contains:  Double cluster  ·  NGC 869  ·  NGC 884
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Double Cluster (NGC 869 and 884), 



    
        

            Scott Johnson
Double Cluster (NGC 869 and 884)
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Double Cluster (NGC 869 and 884)

Getting plate-solving status, please wait...
Double Cluster (NGC 869 and 884), 



    
        

            Scott Johnson
Double Cluster (NGC 869 and 884)
Powered byPixInsight

Double Cluster (NGC 869 and 884)

Acquisition details

Dates:
Oct. 26, 2017
Frames:
50×30(25′)
Integration:
25′
Avg. Moon age:
6.11 days
Avg. Moon phase:
36.59%

Basic astrometry details

Astrometry.net job: 1784989

RA center: 02h20m52s.6

DEC center: +57°0748

Pixel scale: 0.949 arcsec/pixel

Orientation: 179.402 degrees

Field radius: 0.490 degrees

Resolution: 3088x2072

File size: 5.0 MB

Locations: The Driveway, Acworth, GA, United States

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),[1] 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.[2] 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.[3] Based on their individual stars, the clusters are relatively young, both 12.8 million years old.[4] 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.

Comments

Revisions

  • Final
    Double Cluster (NGC 869 and 884), 



    
        

            Scott Johnson
    Original
  • Double Cluster (NGC 869 and 884), 



    
        

            Scott Johnson
    B

Sky plot

Sky plot

Histogram

Double Cluster (NGC 869 and 884), 



    
        

            Scott Johnson