20170827 NGC6888 HaOiiiOiii
NGC6888 The Crescent Nebula imaged in Ha and Oiii from London on 27th August 2017.
TS65Quad Astrograph, Atik314L+ CCD
45 mins Ha, 20mins Oiii captured and processed in Maxim DL and Photoshop CC. Ha mapped to red channel and Oiii mapped to green and blue
[Wikipedia]
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 Friedrich Wilhelm Herschel in 1792. 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.
20170827 NGC6888 HaOiiiOiii
NGC6888 The Crescent Nebula imaged in Ha and Oiii from London on 27th August 2017.
TS65Quad Astrograph, Atik314L+ CCD
45 mins Ha, 20mins Oiii captured and processed in Maxim DL and Photoshop CC. Ha mapped to red channel and Oiii mapped to green and blue
[Wikipedia]
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 Friedrich Wilhelm Herschel in 1792. 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.