07 November 2012

NGC 6888 HaO3RGB

 NGC 6888 in HaO3RGB

-Telescope: William Optics FLT 110 with F/T focuser 3025 and Starizona -Mkit 35 usb motor focus
-Mount: Skywatcher EQ6 Skyscan Pro with EQMod & EQDir
-CCD: Qhy2 Pro at -0c
-Guiding: TS finder 8x50 & Meade DSI 1 
-Location:Salamina,GR and Manor Obs at Piraeus,GR
-Ha 5nm Astrodon(bin 1x1) 200 minutes
-O3 5nm Astrodon 210 minutes
-Baader RGB 126 minutes
-Total exposure: 536 minutes

Information about NGC 6888

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.

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 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.

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