Crescent Nebula (Don Curry)

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

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Crescent Nebula

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Crescent Nebula

This is a closeup and enlarged from previous posted image isolating the Crescent Nebula on this cropped version.

I had decided to use just the OIII and Ha data for this particular processing employing the OIII channel to the blue, and green channel, and the Ha to Red. I tried to carefully bring out more OIII from data while still trying to not oversaturate the entire image. I was going back and forth trying to resolve the issue on if noise reduction was to be used. I decided not to since it was destroying the faint wisp of the OIII data.

This data set is from 18 x 1800 second Ha

and 17 x 1800 second OIII

Please click on image to see enlargement

The below information is cited from wikopedia.

".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. It was discovered by Friedrich Wilhelm Herschel in 1792.[2] 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[3] to 400,000[citation needed] 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.

It is a rather faint object located about 2 degrees SW of Sadr. For most telescopes it requires a UHC or OIII filter to see. Under favorable circumstances a telescope as small as 8 cm (with filter) can see its nebulosity. Larger telescopes (20 cm or more) reveal the crescent or a Euro sign shape which makes some to call it the "Euro sign nebula".

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Status	Basic success
Started	...
Astrometry.net job	1126913
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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