Celestial hemisphere:  Northern  ·  Constellation: Coma Berenices (Com)  ·  Contains:  IC 3946  ·  IC 3949  ·  IC 4051  ·  NGC 4854  ·  NGC 4860  ·  NGC 4865  ·  NGC 4874  ·  NGC 4881  ·  NGC 4889  ·  NGC 4895  ·  NGC 4907  ·  NGC 4908  ·  NGC 4911  ·  NGC 4919  ·  NGC 4921  ·  NGC 4926  ·  NGC 4927
Abell 1656, Peter Hannah
Abell 1656
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Abell 1656

Abell 1656, Peter Hannah
Abell 1656
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Abell 1656

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Description

Abell 1656 is a cluster of galaxies in Coma Berenices, a small constellation with no stars brighter than magnitude 4.The cluster contains over 1000 galaxies and lies at a distance of about 320 million light years.The most prominent members are two giant ellipticals (NGC4874 and NGC4889) and a face-on spiral, NGC4921.In 1933  astronomer Fritz Zwicky was the first to publish evidence of what would later be named dark matter, by demonstrating that the galaxies in the Coma cluster were moving too fast for gravity to hold them together, based on the amount of stars and galaxies visible. It is now believed that dark matter accounts for about 90% of the mass of the cluster.

Total exposure times were 20 hours Lum, 12 hours Red, 10 hours Green and 10 hours Blue.

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Abell 1656, Peter Hannah