NGC 6621 (astroeyes)

Celestial hemisphere: Northern · Constellation: Draco (Dra) · Contains: NGC 6621

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NGC 6621

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NGC 6621

From Bill Keel's web site:

'The larger galaxy is the very disturbed spiral NGC 6621. We view the pair about 100 million years past closest approach, in which NGC 6622 passed just at the edge of the disk of NGC 6621 in an orbit nearly parallel to the disk plane. In addition to the tidal distortion that has pulled the long tail out and wrapped it behind the main body from our vantage point, the encounter has triggered extensive star formation. It is especially interesting that the very compact collection of star clusters and emission nebulae between the two galaxy nuclei coincides with a region in which the dynamics of the disk are so profoundly disturbed that the slope of the velocity field changes sign, which may implicate gravitational instability within the disk (a result of tidal disturbance) as one cause of formation of such massive star clusters.'

which gives some very useful information on this interacting pair, otherwise known as Arp 81. ngc 6621 is the larger galaxy, type Sc, magnitude 13.6, surface brightness 13.9, size 2.1' x 0.8'. ngc 6622, a Sa spiral is as bright at magn. 13.6 but it has a significantly higher surface brightness of 12.4. It is about 0.8' x 0.5' in size. The tidal arm and loop are clearly seen in my image which was taken through my 10"Newt.

Halton Arp considered the companion, ngc 6622, to resemble the M51 companion.

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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
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	Image of the day	Top pick	Top pick nominations	Total submitted
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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.
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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
Started	...
Astrometry.net job	374079
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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