IC5146: The Cocoon Nebula (Denis Janky)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: B168 · Cocoon Nebula · HD208362 · IC 5146 · LBN 424 · LDN 1055 · PGC 167582 · PGC 167590 · PGC 167593 · PGC 167597 · Sh2-125 · VdB147

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IC5146: The Cocoon Nebula

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IC5146: The Cocoon Nebula

The Cocoon Nebula is a reflection/emission nebula of about 15 light-years across that surrounds a young, open star cluster catalogued as Collinder 470. It is located about 4,000 light-years away in the constellation Cygnus. It is both a reflection and an emission nebula; a reflection nebula reflects the light of nearby stars, while an emission nebula emits light when nearby stars ionize the gas. The reflected component (the bluish area along the perimeter) is largely due to the light from the star located near the center of the nebula, which is a hot, young star known as BD +46°3474. In fact, it may actually be a binary system. The nebula is located on the edge of a large molecular cloud, and there is active star formation in this stellar nursery.

It is possible to observe this nebula visually, but a dark sky is required to really see it. I observed it in 2010 with a 20” reflector, and found the hazy glow and lovely star field to be enchanting.

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

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	...
Astrometry.net job	6381207
PixInsight job	R9YAJ72H1LOC00MGMC576XEGS368F12D
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	21h53m32s.340
RA (top/left)	21h56m01s.806
RA (top/right)	21h53m09s.125
RA (bottom/right)	21h51m02s.331
RA (bottom/left)	21h53m55s.131

Dec (center)	+47°15′18″.70
Dec (top/left)	+47°10′21″.46
Dec (top/right)	+47°40′52″.65
Dec (bottom/right)	+47°20′04″.88
Dec (bottom/left)	+46°49′43″.93

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IC5146: The Cocoon Nebula

IC5146: The Cocoon Nebula

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IC5146: The Cocoon Nebula

IC5146: The Cocoon Nebula

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