NCG 7331 (Paul Porto)

Celestial hemisphere: Northern · Constellation: Pegasus (Peg) · Contains: NGC 7317 · NGC 7318 · NGC 7319 · NGC 7320 · NGC 7331 · NGC 7333 · NGC 7335 · NGC 7336 · NGC 7337 · NGC 7338 · NGC 7340 · NGC 7343 · Stephan's Quintet

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NCG 7331

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NCG 7331

This is heavily cropped and zoomed to show detail of NCG 7331, and also Stephan's Quintet (NGCs 7317-7320) to the left of it. I used different PixInsight GAME script masks for NGC 7331 and the quintet, then brought out the detail with the HDRMultiscale process (# of Layers 5 and 4, Small Scale 32 scaling function).

The galaxy is estimated to be about 100,000 light-years in diameter, making it slightly larger than our Milky Way galaxy.
NGC 7331 is about 40M light years from Earth.

The other members of the group, NGC 7335, 7336, 7337 and 7340, lie far in the background at distances of approximately 300-350 million light years.
Stephan's Quintet is about 290M light years away.

In 2014, astronomers discovered a spiral arm in NGC 7331 that appears to be rotating in the opposite direction to the other spiral arms, which is a rare phenomenon in galaxies.

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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
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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
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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
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Amateur hosting facility
Public amaeteur data
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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	7700993
PixInsight job	HNE932MUDZPXF2AOOK33FFMAT6O2V4BA
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	22h36m26s.97
RA (top/left)	22h35m55s.60
RA (top/right)	22h40m27s.49
RA (bottom/right)	22h36m59s.99
RA (bottom/left)	22h32m28s.30

Dec (center)	+34°12′58″.8
Dec (top/left)	+33°22′38″.7
Dec (top/right)	+34°24′08″.2
Dec (bottom/right)	+35°03′26″.6
Dec (bottom/left)	+34°01′22″.6

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NCG 7331

NCG 7331

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NCG 7331

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