Crescent-Nebula (NGC6888) (Michael Langer)

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

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Crescent-Nebula (NGC6888)

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Crescent-Nebula (NGC6888)

Crescent-Nebula (NGC6888)
Der Crescent-Nebula, im Deutschen Mondsichel-Nebel, wurde am 15. Dezember 1792 von William Herschel entdeckt. Es handelt sich dabei um einen Emissionsnebel mit den Ausmaßen von ca. 25x16 Lichtjahren, der sich in einer Entfernung von ca. 4500 Lichtjahren befindet.
Im Zentrum befindet sich der Wolf-Rayet-Stern mit dem Namen W136. Dieser ist sehr massereich und dadurch sehr heiß. Er gibt sehr starke Sternenwinde ab, wodurch er in „nur“ 10´000 Jahren die Masse unserer Sonne verliert.
Das Leuchten wird durch zwei Ionisierungsvorgänge erzeugt. Der größte Teil wird durch die hohen Temperaturen des W136 Sterns verursacht, indem der Nebel stark ionisiert wird (OIII). Das schwächere Leuchten entsteht, wenn die starken Sternwinde auf das interstellare Medium (Staub 😉) treffen und dieses so aufheizen, dass es ebenfalls ionisiert.

Kamera: zwo asi 2600mc-pro
Teleskop: TS-Optics photon 200/1000
Guiding: zwo ASI120Mc
Montierung: skywatcher eq6-r
Filter: optolong l enhance
Rest: zwo asiair, zwo eaf

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	Distinct awarded users	Total awarded images
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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	4924146
PixInsight job	OB9G1NUFQCK5GU7Q6Y56EXVVEKVMAEVQ
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	20h12m02s.394
RA (top/left)	20h14m10s.380
RA (top/right)	20h14m26s.123
RA (bottom/right)	20h09m52s.201
RA (bottom/left)	20h09m41s.114

Dec (center)	+38°20′46″.20
Dec (top/left)	+37°41′02″.75
Dec (top/right)	+38°58′29″.45
Dec (bottom/right)	+39°00′19″.69
Dec (bottom/left)	+37°42′53″.40

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Crescent-Nebula (NGC6888)

Crescent-Nebula (NGC6888)

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