Celestial hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  Crescent nebula  ·  NGC 6888  ·  Sh2-105
NGC6888 Crescent Nebula HaLRGB, Sergiy_Vakulenko
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NGC6888 Crescent Nebula HaLRGB

NGC6888 Crescent Nebula HaLRGB, Sergiy_Vakulenko
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NGC6888 Crescent Nebula HaLRGB

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Description

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 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.

At the left bottom corner you can see barely visible the Soap Bubble Nebula, or PN G75.5+1.7, is a planetary nebula in the constellation Cygnus, near the Crescent Nebula (NGC 6888). It was discovered by amateur astronomer Dave Jurasevich using an Astro-Physics 160 mm refractor telescope who imaged the nebula on June 19, 2007 and on July 6, 2008.

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    NGC6888 Crescent Nebula HaLRGB, Sergiy_Vakulenko
    Original
    NGC6888 Crescent Nebula HaLRGB, Sergiy_Vakulenko
    B
    NGC6888 Crescent Nebula HaLRGB, Sergiy_Vakulenko
    C

B

Description: Ha channel

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C

Description: Enlarged fragment with Soap Bubble Nebula.

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NGC6888 Crescent Nebula HaLRGB, Sergiy_Vakulenko