ACO 1656 - The Coma Galaxy Cluster (Martin Nischang)

Celestial hemisphere: Northern · Constellation: Coma Berenices (Com) · Contains: 41 Com · IC 3900 · IC 3913 · IC 3943 · IC 3946 · IC 3947 · IC 3949 · IC 3955 · IC 3957 · IC 3960 · IC 3963 · IC 3973 · IC 3976 · IC 3990 · IC 3991 · IC 3998 · IC 4011 · IC 4012 · IC 4026 · IC 4030 · IC 4032 · IC 4040 · IC 4042 · IC 4044 · IC 4045 · IC 4051 · IC 4088 · IC 4106 · IC 4111 · IC 4133 · And 68 more.

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ACO 1656 - The Coma Galaxy Cluster

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ACO 1656 - The Coma Galaxy Cluster

ACO 1656 (or Abell 1656) contains thousands of galaxies, and is visible nearly the galactic north pole, nearly unobscured by any dust, gas or stars of our milky way.

Dominated by two elliptical giants, NGC 4889 and NGC 4874, exceeding 250 thousand light years in diameter and much more massive than any other galaxy even in the Virgo supercluster, this cluster is located nearly 300 mio light years (Mly) away from our Milky way.

Even two much more distant galaxy clusters are clearly visible, ACO 1661 and ACO 1641.

I wanted to image this beautiful galaxy cluster in spring, before midnight twilights begin at our latitudes (52° north).

This telescopic view is just to show the usable field of the RASA8 (with imaging resolution of nearly 2"/pixel): a circle of around 3.3 degrees in diameter.

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
Artificial satellite

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.

Status	Advanced success
Started	...
PixInsight job	WTM5A0EZMW30W1T4BCBSNLT6YYGRGHQB
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	12h59m38s.83
RA (top/left)	13h06m53s.13
RA (top/right)	12h51m27s.42
RA (bottom/right)	12h52m38s.27
RA (bottom/left)	13h07m36s.27

Dec (center)	+28°00′10″.1
Dec (top/left)	+29°46′21″.5
Dec (top/right)	+29°33′29″.1
Dec (bottom/right)	+26°12′21″.2
Dec (bottom/left)	+26°24′56″.6

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ACO 1656 - The Coma Galaxy Cluster

ACO 1656 - The Coma Galaxy Cluster

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ACO 1656 - The Coma Galaxy Cluster

ACO 1656 - The Coma Galaxy Cluster

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