Stephan's Quintet (Stefano Quaresima)

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 "Stephan Quintet" ... One of the most difficult and at the same time spectacular astronomical objects in the sky, one of those that, for their beauty and above all for the theory that describes their origin, conquers and kidnaps you ...
Stephan's Quintet is a visual group of five galaxies located in the constellation of Pegasus. According to some studies, not all of these galaxies would be really close to each other, in fact, NGC 7320 is in random overlap due to our line of observation, while the rest seem to be relatively close. NGC 7320 could be about 32 million light years from our galaxy while the other four are at distances between 280 and 340 million light years.
These galaxies are interesting for their violent interactions. There are huge intergalactic shock waves, visible in the image as arcs that come out of one galaxy to enter another. During the collision between the NCG 7318b and the NCG 7318a, the gases escape from the clusters of stars and the superheated hydrogen atoms emit radiation.
The faint galaxy located above, NGC 7320c, crossed the central group hundreds of millions of years ago; this interaction ripped part of its gas from the galaxy NGC 7319, giving rise to a violent episode of star formation, indicated in the diagram as "Starburst region". This distant interaction event could be responsible for the formation of the long tidal tails that extend east of the galaxy.
Shooting details:
Meade LX200 16 ”ACF telescope
Optec Lepus 0.63 reducer
Atik 383L + mono CCD camera at -15 degrees in bin 2
Luminance: Baader UV / IR CUT filter 240x300 sec. - total exposure 20 hours
Baader RGB Filters: 40X300 sec. each - total exposure 10 hours
Filming from August 23 to September 2
Olevano Romano (Rome), Italy

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	Distinct awarded users	Total awarded images
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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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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
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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.

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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	6255672
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Stephan's Quintet

Stephan's Quintet

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Stephan's Quintet

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