C11 - Nébuleuse de la bulle (Arthur Grosmaitre)

C11 - Nébuleuse de la bulle

La nébuleuse de la bulle photographiée le 24 Août 2023 avec un Canon 7D Mk.II monté sur un Celestron EdgeHD 8 en autoguidage. Elle provient de 37 clichés de 6 minutes pour un temps total de 3h42 d’exposition. On peut voir que malgré ce temps d’exposition relativement important, l’objet est peu lumineux et un fort bruit est apparu dans la photo. Il serait donc intéressant de le reprendre à l’avenir.

Cet objet est impressionnant par la rondeur de la bulle qu’il contient. Pourtant, il ne s’agit pas d’un rémanent de supernova. La bulle est formée des vents stellaires issus de l’étoile brillante excentrée à droite de la bulle. Cette étoile est aussi une étoile de Wolf-Rayet d’où la violence des vents qui s’en échappent. Ensuite, ces gaz sont ionisés par l’émission ultraviolette de l’étoile et émettent en se désexcitant. Aujourd’hui, la bulle délimite une sphère d’influence de l’étoile de Wolf-Rayet sur une zone de 10 années lumières de large contre 12h pour l’héliosphère solaire.
Aussi, la raison pour laquelle la bulle est excentrée réside dans la densité de la nébuleuse, le déplacement des gaz dans certaines directions étant ralenti par d’autres gaz. De plus, ce ralentissement des gaz éjectés augmente la densité locale et donc l’intensité lumineuse, visible ici sur le bord droit de la bulle.

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	n/a
Started	n/a
Astrometry.net job	n/a
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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