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Object Crescent Nebula
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
Scope Explore Scientific 127ed APO refractor
Camera ST2000XCM
Mount Losmandy G11
Filters LPS filter
Guiding St-i through a Zenithstar 80mm refractor
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 October 31, 2018
Copyright Photo copyright Thomas Kerns, Beluga Lake Observatory

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