Crescent nebula (Bernard DELATTRE)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Crescent Nebula · NGC 6888 · Sh2-105

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Crescent nebula

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Crescent nebula

Cet objet, à environ 5000 années-lumière dans la constellation du Cygne, est une belle nébuleuse constituée d'une coquille de gaz en expansion d'environ 25 années-lumière de diamètre. La coquille est emportée par les vents de son étoile centrale, brillante et massive. Pendant un temps, j'ai pensé que cet objet était une nébuleuse planétaire, et vous le verrez parfois référencé comme tel. Mais l'étoile centrale est classée comme une étoile de Wolf-Rayet, ce qui signifie qu'elle subit un taux élevé de perte de masse, et donc la nébuleuse Wolf-Rayet résultante a eu un processus de formation différent de celui qu'elle aurait eu en tant que nébuleuse planétaire.

L'étoile progénitrice est désignée WR136 et est l'étoile bleuâtre brillante au centre de la nébuleuse. L'étoile perd son enveloppe extérieure dans un fort vent stellaire, éjectant l'équivalent de la masse du Soleil tous les 10 000 ans. Les structures complexes de la nébuleuse sont le résultat de l'interaction de ce vent fort avec le matériau éjecté lors des phases précédentes.

Extrait text de Gary Imm

Final
Original
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Narrowband imaging
ZWO ASI1600MM/QHY163M
N.I.N.A. Users

0a.Most Recent
2a. Images L_RVB
Nébuleuses diffuses par émission & réflexion

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	Distinct awarded users	Total awarded images
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	Image of the day	Top pick	Top pick nominations	Total submitted
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	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.
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	3441389
PixInsight job	P3QNA0FNM1T4UNZEGFJWCBXFT2W1MSEE
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	20h12m07s.82
RA (top/left)	20h14m54s.64
RA (top/right)	20h09m32s.28
RA (bottom/right)	20h09m22s.90
RA (bottom/left)	20h14m41s.45

Dec (center)	+38°20′04″.8
Dec (top/left)	+38°42′04″.8
Dec (top/right)	+38°45′01″.5
Dec (bottom/right)	+37°57′53″.6
Dec (bottom/left)	+37°54′56″.2

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Crescent nebula

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