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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 was discovered by William 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.Description
(Source: Wikipedia)
Acquisition
Date 2018 Aug. 10th Bortle scale 3Exposure 3h29H-alpha 12 x 600sOIII 5 x 600sRed 13 x 60sGreen 13 x 60sBlue 13 x 60sAcquisition
Equipment
Facility Mobile setupLocation Salzstiegl, AustriaTelescope Lacerta Newton 200/800Imaging cam ZWO ASI 1600MM CoolCorrector GPU Optics coma corrector 1:1 Mount SkyWatcher AZ-EQ6 ProFilters Optolong H-Alpha 7nm Optolong OIII 6,5nm Optolong Red 36mm Optolong Green 36mm Optolong Blue 36mmGuiding cam ZWO ASI 120MM MiniGuiding SkyWatcher Finder 8x50Accessories Lacerta Flatfield box Lacerta MFOC Processing Gimp, SirilAutomation Stellarmate, Ekos & KstarsEquipment
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