Abell 1656/Coma-cluster/Ngc4889 (Jens Andersen Dolmer)

Abell 1656/Coma-cluster/Ngc4889

The Coma Galaxy Cluster, listed as Abell 1656, is a regular cluster more than 350 million light years away from earth in the constellation of Coma Berenices, near the north galactic pole. It is estimated that over 1000 galaxies are part of the Coma Cluster, making it very rich. Coma is nearly spherical and is consisting mainly of elliptical and highly-flattened eliptical galaxies. These galaxies have been estimated to be approximately 15 billion years old. Along with the Leo Cluster (Abell 1367), it is one of the two major clusters comprising the Coma Supercluster.
Two giant elliptical galaxies, NGC 4889 and NGC 4874, dominate the foreground of Coma. Like other galaxy clusters, Coma's center consists of a diffuse cloud of hot gas which emits x-rays and is held by the cluster's gravity.
The central part of the Coma Berenices cluster covers a roughly circular area about 1 1/2 degrees across. That’s nine times the area of a full moon, which is about 1/2 a degree across. However, the full cluster may extend farther, and numerous other galaxy clusters are in the same area of the sky.

Please note: The following tables are updated every 24 hours.

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.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
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.

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