Crescent Nebula
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Object
Crescent Nebula
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Description
The Crescent Nebula, or NGC 6888 is a rather faint emission nebula in Cygnus, located about 5,000 light years 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. -
Image
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Scope
Explore Scientific 127ed APO refractor
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Camera
ST2000XCM
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Mount
Losmandy G11
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Filters
LPS filter
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Guiding
St-i through a Zenithstar 80mm refractor
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Exposure Info
43 X 15 minute exposures for a total exposure or 10.75 hours It was imaged over several nights between 10/30/2018 and 11/5/2018. -
Date
10/31/2018
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Copyright
Photo copyright Thomas Kerns, Beluga Lake Observatory
