The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105), Pablo Lewin

The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105)

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Description

Celestron C14 Edge HD LRGB HA 5 each at 600 seconds and 2 each at 1200 seconds. Extreme Los Angeles California light pollution, smog, moom light etc... Partial picture on my way to collecting 30 hours worth of subs for this target..someday.

Software SGP and PHD2 processed with a combination of CCDstack, Pixinsight and PS CC (Why so many? because I haven't been able to master any of them yet. I have years to go for that!) LOL!

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Pablo Lewin at Maury Lewin Memorial Astronomical Observatory.

22 mins

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 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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The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105), Pablo Lewin