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Contains:  NGC 957, NGC 884, Double cluster, NGC 869, The star 7Per, The star 8Per
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Double Cluster, 





    
        

            John Corban
Double Cluster

Double Cluster

Technical card

Resolution: 5626x3731

Dates:Dec. 1, 2016

Frames: 12x60" ISO800

Integration: 0.2 hours

Avg. Moon age: 1.79 days

Avg. Moon phase: 3.57%

Astrometry.net job: 3087022

RA center: 2h 20' 53"

DEC center: +57° 6' 7"

Pixel scale: 2.166 arcsec/pixel

Orientation: 355.507 degrees

Field radius: 2.031

Data source: Backyard

Description

The open star clusters NGC 869 and NGC 884 form the famous Double Cluster in Perseus. It was first cataloged by the Greek astronomer Hipparcos in 130 B.C. For unknown reasons, Messier did not include the Double Cluster in his famous catalogue.
Both clusters are also blue-shifted, with NGC 869 approaching Earth at a speed of 22 km/s and NGC 884 approaching at a similar speed of 21 km/s.
~ from SkySafari

Comments

Author

JohnPDX
John Corban
License: None (All rights reserved)
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Double Cluster, 





    
        

            John Corban