NGC 6888 (Nébuleuse du Croissant) (Christophe Monnier)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Crescent Nebula · HD192003 · HD192020 · HD192102 · HD192123 · HD192163 · HD192182 · HD192303 · HD192361 · HD192444 · LBN 203 · NGC 6888 · Sh2-105

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NGC 6888 (Nébuleuse du Croissant)

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NGC 6888 (Nébuleuse du Croissant)

Située dans la constellation du Cygne, NGC 6888 est à environ 5 000 années-lumière de nous. Également appelée nébuleuse du Croissant c'est une "bulle cosmique" d’environ 25 années-lumière de diamètre soufflée par les vents de son étoile centrale dont la température de surface atteint 70 000°K. L’étoile massive au cœur de NGC 6888 est une étoile de type Wolf-Rayet qui expulse son enveloppe externe sous la forme d’un puissant vent stellaire et qui l’amène à perdre une masse équivalente à celle du Soleil tous les 10 000 ans. La matière composant l’enveloppe a été éjectée de l’étoile il y a 400 000 ans avec une vitesse d'expansion actuelle estimée à environ 50 km/s. Brûlant son carburant à un rythme prodigieux et approchant de la fin de sa vie, cette étoile devrait finir par exploser en supernova entre 100 000 ans et 1 million d’années.

Original
Final
E

Nébuleuses planétaires

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Distribution of astrophotographers

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	Distinct awarded users	Total awarded images
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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
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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
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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.
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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	8745629
PixInsight job	WJ6M0TLSH8RHJTR7B7WG64VFYQK4RBV7
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	20h12m08s.647
RA (top/left)	20h13m37s.611
RA (top/right)	20h13m26s.779
RA (bottom/right)	20h10m39s.640
RA (bottom/left)	20h10m51s.235

Dec (center)	+38°19′51″.32
Dec (top/left)	+37°57′32″.72
Dec (top/right)	+38°43′44″.60
Dec (bottom/right)	+38°42′06″.33
Dec (bottom/left)	+37°55′58″.61

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NGC 6888 (Nébuleuse du Croissant)

NGC 6888 (Nébuleuse du Croissant)

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NGC 6888 (Nébuleuse du Croissant)

NGC 6888 (Nébuleuse du Croissant)

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