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Contains:  NGC 884, Double cluster, NGC 869
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NGC 884_NGC 869  , 





    
        

            Mike Freeberg
NGC 884_NGC 869

NGC 884_NGC 869

Technical card

Resolution: 5346x3462

Dates:Oct. 6, 2016

Frames: 87x240" ISO800 bin 1x1

Integration: 5.8 hours

Darks: ~25

Flats: ~40

Bias: ~100

Avg. Moon age: 4.93 days

Avg. Moon phase: 25.11%

Astrometry.net job: 1271128

RA center: 35.218 degrees

DEC center: 57.121 degrees

Pixel scale: 0.552 arcsec/pixel

Orientation: 179.451 degrees

Field radius: 0.488 degrees

Description

NGC 884 is an open cluster located 7600 light years[2] away in the constellation of Perseus. It is the easternmost of the Double Cluster with NGC 869. NGC 869 and 884 are often designated h and χ Persei, respectively.[3] The cluster is most likely around 12.5[2] million years old. Located in the Perseus OB1 association, both clusters are located physically close to one another, only a few hundred light years apart. The clusters were first recorded by Hipparchus, but have likely been known since antiquity.
The Double Cluster is a favorite of amateur astronomers. These bright clusters are often photographed or observed with small telescopes. Easy to find, the clusters are visible with the unaided eye between the constellations of Perseus and Cassiopeia as a brighter patch in the winter Milky Way.
In small telescopes the cluster appears as a beautiful assemblage of bright stars located in a rich star field. Dominated by bright blue stars the cluster also hosts a few orange stars that add to the visual interest. Both clusters together offer a spectacular low magnification view

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Author

Mike17
Mike Freeberg
License: None (All rights reserved)
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NGC 884_NGC 869  , 





    
        

            Mike Freeberg

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