IC 5146 - COCOON NEBULA (Alberto Maria Casati)

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

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IC 5146 - COCOON NEBULA

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IC 5146 - COCOON NEBULA

IC 5146
si tratta di un ammasso aperto legato ad una piccola nebulosa ad emissione e riflessione, chiamata anche "cocoon nebula", presente nella costellazione del cigno.
Questa nebulosa è collegata a sua volta ad un sistema di nebulose oscure molto vaste, visibili soltanto con un campo inquadrato molto ampio.
Distante all'incirca 3.300 anni luce con magnitudine apparente 10.0.
IC 5146 è un ammasso stellare in cui è in corso la formazione di molto stelle. Le osservazioni del telescopio spaziale Spitzer e dell'Osservatorio a raggi X Chandra hanno identificato collettivamente centinaia di giovani oggetti stellari. Le giovani stelle si vedono sia nella nebulosa a emissione, dove il gas è stato ionizzato da giovani stelle massicce, sia nella nuvola molecolare scura nell'infrarosso che forma la "coda". La stella più massiccia della regione è BD +46 3474, una stella di classe B1 che è stimata 14±4 volte la massa del Sole.

IC 5146
it is an open cluster linked to a small emission and reflection nebula, also called "cocoon nebula", present in the constellation of the swan.
This nebula is in turn connected to a system of very large dark nebulae, visible only with a very wide field of view.
Approximately 3,300 light years away with apparent magnitude 10.0.
IC 5146 is a star cluster in which many stars are forming. Observations from the Spitzer Space Telescope and the Chandra X-ray Observatory have collectively identified hundreds of young stellar objects. Young stars are seen both in the emission nebula, where the gas has been ionized by massive young stars, and in the dark infrared molecular cloud that forms the "tail". The most massive star in the region is BD +46 3474, a class B1 star that is estimated to be 14 ± 4 times the mass of the Sun.

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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	6506587
PixInsight job	D2G0UYXA23MKBP7S8XIPRGFQMYZT2FU2
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	21h53m32s.41
RA (top/left)	21h53m07s.40
RA (top/right)	21h51m02s.81
RA (bottom/right)	21h53m56s.91
RA (bottom/left)	21h56m03s.46

Dec (center)	+47°14′19″.5
Dec (top/left)	+47°43′49″.7
Dec (top/right)	+46°58′49″.8
Dec (bottom/right)	+46°44′50″.6
Dec (bottom/left)	+47°29′38″.0

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IC 5146 - COCOON NEBULA

IC 5146 - COCOON NEBULA

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IC 5146 - COCOON NEBULA

IC 5146 - COCOON NEBULA

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