Crescent Nebula NGC 6888 (Göran Nilsson)

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

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Crescent Nebula NGC 6888

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Crescent Nebula NGC 6888

The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105) is an emission nebula in the constellation Cygnus, about 5000 light-years away from Earth. It is formed by the fast stellar wind from the Wolf-Rayet star WR 136 (HD 192163) colliding with and energizing the slower moving wind ejected by the star when it became a red giant around 250,000 to 400,000 years ago. The result of the collision is a shell and two shock waves, one moving outward and one moving inward. The inward moving shock wave heats the stellar wind to X-ray-emitting temperatures. All according to Wikipedia.

This is Ha, Sii and Oiii data from Telescope Live at the IC Astronomy hosting facility at 1250m elevation in Oria, Almeria, Spain. Ha is 20 x 5 min, Sii is 10 x 5 min, and Oiii is 20 x 5 min.

I started off with Ha in the red channel, Sii in green, and Oiii in blue, and then tweaked the colours in PS towards a more RGB like image.

Original
B
Final
C

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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	4708890
PixInsight job	HPSXSNW75SO6SJM0X6XE0CA7Q91RE1EK
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	20h12m13s.250
RA (top/left)	20h13m16s.866
RA (top/right)	20h11m09s.224
RA (bottom/right)	20h11m09s.972
RA (bottom/left)	20h13m16s.953

Dec (center)	+38°20′17″.99
Dec (top/left)	+38°32′56″.86
Dec (top/right)	+38°32′52″.39
Dec (bottom/right)	+38°07′37″.16
Dec (bottom/left)	+38°07′40″.86

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Crescent Nebula NGC 6888

Crescent Nebula NGC 6888

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Crescent Nebula NGC 6888

Crescent Nebula NGC 6888

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