IC5146 - The Cocoon Nebula in LHaRGB (Cfosterstars)

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

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IC5146 - The Cocoon Nebula in LHaRGB

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IC5146 - The Cocoon Nebula in LHaRGB

This image of the Cocoon nebula was taken with my Meade 10" ACF SCT with OAG. I had not used OAG until recently, but have it working well now. The Ha blending worked very well with PixInsight in the non-linear state.

IC 5146 (also Caldwell 19, Sh 2-125, and the Cocoon Nebula) is a reflection/emission nebula and Caldwell object in the constellation Cygnus. The NGC description refers to IC 5146 as a cluster of 9.5 mag stars involved in a bright and dark nebula. The cluster is also known as Collinder 470. It is located near the naked-eye star Pi Cygni, the open cluster NGC 7209 in Lacerta, and the bright open cluster M39. The cluster is about 4,000 ly away, and the central star that lights it formed about 100,000 years ago; the nebula is about 12 arcmins across, which is equivalent to a span of 15 light years.

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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.

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	2947282
PixInsight job	CEYQG8RVKPYBEYOHL5Y13UCDLP0PZYHK
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	21h53m25s.856
RA (top/left)	21h54m20s.762
RA (top/right)	21h54m21s.567
RA (bottom/right)	21h52m30s.261
RA (bottom/left)	21h52m30s.214

Dec (center)	+47°15′59″.99
Dec (top/left)	+47°03′38″.82
Dec (top/right)	+47°28′18″.67
Dec (bottom/right)	+47°28′20″.74
Dec (bottom/left)	+47°03′43″.00

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IC5146 - The Cocoon Nebula in LHaRGB

IC5146 - The Cocoon Nebula in LHaRGB

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IC5146 - The Cocoon Nebula in LHaRGB

IC5146 - The Cocoon Nebula in LHaRGB

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