Stephan's Quintet (Robert.S)

Celestial hemisphere: Northern · Constellation: Pegasus (Peg) · Contains: NGC 7317 · NGC 7318 · NGC 7319 · NGC 7320

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Stephan's Quintet

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Stephan's Quintet

The interacting galaxies in Stephan’s Quintet lie at an approximate distance of 300 million light years and will eventually merge into a single large elliptical galaxy. The member of Stephan’s Quintet that is not physically associated with the compact group, NGC 7320, is considerably closer to us, at a distance of 39 million light years.

The galaxies in the middle of the group, NGC 7318A and NGC 7318B (mag. 14.4 and 13.9), have already begun to merge with each other. The collision has drawn out long tails of stars from each galaxy and triggered massive bursts of star forming activity.

NGC 7318B is falling into the centre of the group at a speed of several millions of kilometres per hour, causing an enormous intergalactic shock wave, one bigger than our galaxy. This was first detected in radio observations in the 1970s, when a filament of emission between the galaxies was discovered, but its nature was uncertain at the time. In visible light, the same region shows a green arc, a faint glow of ionized atomic hydrogen.

Hickson Galaxy Clusters
Short exposures DSO
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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
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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
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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	Basic success
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Astrometry.net job	4388432
PixInsight job	n/a
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Stephan's Quintet

Stephan's Quintet

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Image Index:

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Stephan's Quintet

Stephan's Quintet

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Description

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