NGC 6888 Crescent Nebula (Tim Trentadue)

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

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NGC 6888 Crescent Nebula

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NGC 6888 Crescent Nebula

Found among the great Hydrogen clouds in the constellation Cygnus the Crescent nebula is a challenging target both to capture and process, I will need more Oiii to compleate the envelope around the nebula but I am very happy with the progress so far.

The Crescent Nebula also known as NGC 6888, The Brain, The Dividing Cell, Caldwell 27 and Sharpless 105 is an emission nebula in the constellation Cygnus, about 5000 light-years away from Earth. It was discovered by Friedrich Wilhelm Herschel in 1792.

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.

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	2327741
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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NGC 6888 Crescent Nebula

NGC 6888 Crescent Nebula

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