Abell 1656 Galaxy Cluster (Jeff Weiss)

Celestial hemisphere: Northern · Constellation: Coma Berenices (Com) · Contains: NGC 4839 · NGC 4848 · NGC 4874 · NGC 4889 · NGC 4895 · NGC 4908 · NGC 4921 · NGC 4926

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Abell 1656 Galaxy Cluster

Link: https://www.astrobin.com/341219/

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Abell 1656 Galaxy Cluster

Link: https://www.astrobin.com/341219/

4.2hr LRGB

Also known as the Coma Cluster, Abell 1656 is a large galaxy cluster of over 1000 identified galaxies, 450 of which are identified by PI image solver in this image. It's mean distance is 320 MLY and the central region is dominated by two giant ellipticals, NGC 4874 and NGC 4889. Predominantly elliptical (old) galaxies, this galaxy cluster produces large amounts of hot X-ray emitting gas and dark matter. This object is very interesting because it is the cluster from which Fritz Zwicky concluded in the 1930's that the galaxies' rotational fall off was far too slow for the observed matter distribution and inferred the existence of dark matter, inventing the term 50 years ahead of his time. This cluster is now accepted to have 90% of its mass in dark matter.

CORRECTION: Actually Zwicky's 1930's conjecture (and naming of "dark matter") was NOT based on flattening rotational velocity but on an insufficient stellar luminance calculation. (12/12/14)

North is up. There is actually a quasar QSO [HB89] 1256+280 that is 11.3 +- 1.0 billion light years away in this image, far beyond the Abel 1656 galaxies. Follow the link above to see it.

D.A.R.C. Observatory, Mercey Hot Springs , CA May-June 2014

Original
C
D
Final
E

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Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

Distribution of data sources

This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Advanced failed
Started	...
Astrometry.net job	6027728
PixInsight job	VUQ9BMLFR6W9R9ZGRKKB5PGSKB2YV58M
PixInsight queue size	n/a
PixInsight stage	PLATE_SOLVING_IMAGE

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Abell 1656 Galaxy Cluster

Abell 1656 Galaxy Cluster

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Abell 1656 Galaxy Cluster

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