Arp 172 (Abell 2151) (Gary Imm)

Celestial hemisphere: Northern · Constellation: Hercules (Her) · Contains: IC 1173 · IC 1178 · IC 1179 · IC 1181 · IC 1182 · IC 1183 · IC 1184 · IC 1185 · IC 1186 · IC 1188 · NGC 6043 · NGC 6045 · NGC 6047 · NGC 6050 · NGC 6054 · PGC 140568 · PGC 1530158 · PGC 1530762 · PGC 1531216 · PGC 1531267 · PGC 1532072 · PGC 1532291 · PGC 1536659 · PGC 1536670 · PGC 1536800 · PGC 1538912 · PGC 1539367 · PGC 1540022 · PGC 1540143 · PGC 1540468 · And 43 more.

Arp 172 (Abell 2151)

This object is the magnificent Hercules Galaxy Cluster. The cluster consists of 200 galaxies located 500 million light-years away in the constellation of Hercules. The image is best seen in the full resolution view. The image is about one degree across, which encompasses a span of almost 10 million light years.

The Hercules Cluster is one of the few galaxy clusters without a huge elliptical galaxy at its center, at least not yet. At the very center of the image is Arp 272, a trio of interacting galaxies. Many other merging and interacting galaxies are seen throughout the image.

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Description: Comparison to Original Arp Image

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Distribution of astrophotographers

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	Distinct awarded users	Total awarded images
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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
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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
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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	...
Astrometry.net job	4192411
PixInsight job	0XIXV7ODVUIT1KJJ0PPFD26IQWV98PD1
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	16h05m33s.750
RA (top/left)	16h04m46s.240
RA (top/right)	16h04m49s.176
RA (bottom/right)	16h06m19s.790
RA (bottom/left)	16h06m17s.118

Dec (center)	+17°35′53″.71
Dec (top/left)	+17°51′51″.52
Dec (top/right)	+17°19′28″.41
Dec (bottom/right)	+17°19′55″.40
Dec (bottom/left)	+17°52′18″.38

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Arp 172 (Abell 2151)

Arp 172 (Abell 2151)

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Arp 172 (Abell 2151)

Arp 172 (Abell 2151)

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