Cocoon Nebula (Luca Dinoi)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Cocoon Nebula · IC 5146

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Cocoon Nebula

Link: https://flic.kr/p/2ouGw7s

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Cocoon Nebula

Link: https://flic.kr/p/2ouGw7s

IC 5146 Cocoon Nebula
IC 5146, (also known as C 19), is an open cluster attached to a diffuse nebula visible in the constellation Cygnus.
The nebula is an agglomeration of gas and dust containing young stars that have excavated its interior, as happens in M 42. The nebula is rich in hydrogen, it is an HII region, which emits light by emission and is the one that it is referred to as a "star factory". It has an overall magnitude of 7.2 and is about half as wide as the lunar disk. It has an irregular shape, even if roughly rounded, with a real diameter of about 15 light years and is found inside an open cluster, in which there are several stars suspected of being variable, which illuminate part of it also by reflection.
The brightest star of the open cluster has a magnitude of 9.74, an age of about one hundred thousand years, but probably it is not part of it (it overlaps the cluster prospectively), as its distance seems different from that of the cluster is equal to only 3,300 light years.
Steve Coe's commentary reports that the nebula and cluster are about one degree distant from a dark matter filament Barnard 168 (B 168), which extends about two degrees and projects onto the disk of the Milky Way. The dark nebula is clearly visible in Ligustri's image: it is the dark filament that surrounds the nebula and moves away to the right.

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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
Solar system
Extremely wide field
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
Own remote observatory
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.

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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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Status	Basic success
Started	...
Astrometry.net job	7589765
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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