Cocoon Nebula IC 5146 (John R Carter, Sr.)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: B168 · Cocoon Nebula · IC 5146 · Sh2-125 · VdB147

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Cocoon Nebula IC 5146

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Cocoon Nebula IC 5146

From SkySafari:

The Cocoon Nebula, cataloged as IC 5146, is a strikingly beautiful emission nebula and star cluster located about 4,000 light years away in the constellation Cygnus. It is located near the star Pi Cygni, the open cluster NGC 7209 in Lacerta, and the bright open cluster M 39.

IC 5146 shines at magnitude 7.2, and has an apparent diameter of 12’ (less than half the size of the Moon), which is equivalent to a span of 15 light years.

Like other stellar nurseries, the Cocoon Nebula holds a bright red emission nebula, blue reflection nebulae, and dark absorption nebulae. Inside the Cocoon Nebula is a newly developing cluster of stars. The massive central star, which formed about 100,000 years ago, now provides the energy source for much of the emitted and reflected light from this nebula.

When viewing IC 5146, dark nebula Barnard 168 is an inseparable part of the experience. It forms a dark lane that surrounds the cluster and projects westward, forming the appearance of a trail behind the Cocoon.

Please note: The following tables are updated every 24 hours.

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
Artificial satellite

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.

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	...
PixInsight job	GLTPIX49SPDBSFWOR4HF2YJMQQJUW3RI
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	21h53m19s.83
RA (top/left)	21h50m48s.84
RA (top/right)	21h51m02s.66
RA (bottom/right)	21h55m53s.79
RA (bottom/left)	21h55m34s.27

Dec (center)	+47°14′57″.9
Dec (top/left)	+46°45′15″.6
Dec (top/right)	+47°46′44″.2
Dec (bottom/right)	+47°44′27″.10
Dec (bottom/left)	+46°43′03″.4

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Cocoon Nebula IC 5146

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Cocoon Nebula IC 5146

Cocoon Nebula IC 5146

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