IC 5146 The Cocoon Nebula (Roland Schliessus)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: B168 · Cocoon Nebula · HD208362 · IC 5146 · LBN 424 · LDN 1055 · Sh2-125

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IC 5146 The Cocoon Nebula

Link: http://www.roland-schliessus-astro.de/

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IC 5146 The Cocoon Nebula

Link: http://www.roland-schliessus-astro.de/

IC 5146, also known as the Cocoon Nebula, is an astronomical nebula with an embedded open star cluster in the constellation Cygnus. The star cluster is called Collinder 470.

The nebula has an apparent extent of about 10 arc minutes and is about 3000 light-years from Earth; its physical extension is about 10 light years.

The nebula is a star-forming region of ionized atomic hydrogen and has emissive, reflective, and absorbing components.
IC 5146 is seen from Earth at the eastern end of the oblong dark cloud Barnard 168 and together with it is part of an extended molecular cloud. A little to the west lies the reflection nebula of vdB 147, which probably also belongs to the complex.

The brisk star formation going on inside the cloud is leading to the formation of a young open star cluster dubbed Collinder 470, with an apparent magnitude of 7.2 and an estimated age of a few hundred thousand years. This star cluster, and in particular the brightest star at its center, BD +46° 3474 (type B0 V, mag 10), is responsible for the nebula's ionization and hence its glow. They create a "cave" in the dust and gas of the molecular cloud, allowing us to see inside.

The nebula was discovered photographically by Edward Barnard on October 11, 1893, and later independently by Max Wolf (July 28, 1894).

======================= Source: Wikipedia ====================================

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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.
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	7425182
PixInsight job	F6C7K1Z5KIHGJX3XUXV9R42V2DZ23HZ6
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	21h53m28s.433
RA (top/left)	21h54m47s.624
RA (top/right)	21h53m48s.870
RA (bottom/right)	21h52m08s.783
RA (bottom/left)	21h53m08s.986

Dec (center)	+47°15′57″.37
Dec (top/left)	+47°06′25″.23
Dec (top/right)	+47°32′06″.53
Dec (bottom/right)	+47°25′26″.54
Dec (bottom/left)	+46°59′48″.16

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IC 5146 The Cocoon Nebula

IC 5146 The Cocoon Nebula

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IC 5146 The Cocoon Nebula

IC 5146 The Cocoon Nebula

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