Crescent Nebula - HaOIIIRGB (Steve Milne)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Crescent nebula · NGC 6888 · The star 34Cyg

Crescent Nebula - HaOIIIRGB, Steve Milne

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Crescent Nebula - HaOIIIRGB

Link: https://stevemilne.smugmug.com/Photos/Sky/Nebulae/i-LJdKPnd

Powered byPixInsight

Crescent Nebula - HaOIIIRGB

Link: https://stevemilne.smugmug.com/Photos/Sky/Nebulae/i-LJdKPnd

The Crescent Nebula is an emission nebula in the constellation of Cygnus (The Swan). The star at the centre of this object is a Wolf-Rayet star (WR 136) which is ejecting gas as a fast 'stellar wind'. This stellar wind is colliding with and energizing gases left over from the star's previous state (around 250,000 years ago) as a red giant, leading to the complex pattern seen here.

Imaging through Ha and OIII filters show these different gases well.

This image is the result of several nights of data collection from the Deep Sky West facility in New Mexico between March and June 2016. It consists:

Red: 8 x 300s

Green: 8 x 300s

Blue: 8 x 300s

Ha: 18 x 1800s

OIII: 17 x 1800s

A total of 19.5 hours of exposure.

Original
Final
B

B

Description: I saw Peter Goodhew's stunning Crescent recently - https://www.astrobin.com/356331/?nc=user - and decided I had to have another crack at processing this image. I have failed, of course, to come anywhere close to Peter's masterpiece. But I think this version is slightly better than my last butchering of the DSW data.

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Status	Basic success
Started	...
Astrometry.net job	2158488
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Crescent Nebula - HaOIIIRGB

Crescent Nebula - HaOIIIRGB

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Crescent Nebula - HaOIIIRGB

Crescent Nebula - HaOIIIRGB

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