NGC 6888 Crescent Nebula (David Wills (PixelSkiesAstro))

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NGC 6888 Crescent Nebula

NGC 6888 Crescent Nebula Taken on 3/9/2013 10 x 300 secs stacked in dss processed in pixinsight would have liked to have got more time on this one but due to the clouds had to pack up early I will definitely revisit this one. Taken with a QHY8L with a Astronomik CLS Filter (not IR blocked) LP filter a Skywatcher 200 pds with a Skywatcher coma corrector on a AZ EQ6-GT goto guided with a QHY5 in a finderguider. First time guiding with MaxIm DL 5

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 8cm (with filter) can see its nebulosity. Larger telescopes (20cm or more) reveal the crescent or a Euro sign shape which makes some to call it the "Euro sign nebula".

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NGC 6888 Crescent Nebula

NGC 6888 Crescent Nebula

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