NGC 6888 The Crescent Nebula. A Tough Target Reworked
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.
(Source: Wikipedia.org)
Technical for This Image: NGC 6888, The Crescent Nebula, is a difficult target to capture. First, it is a faint nebula and requires a good number of exposures and integration time. Second, it is in a dense star field, so image processing to bring out the nebula's detail can also over-brighten the stars around the object. This image was captured with an Explore Scientific ED102 APO Refractor telescope. At the prime focus was a ZWO ASI294MC Pro camera set to 240 Gain and cooled to a temperature of -5C. Exposures were 140 x 45s each. Guiding was done through an Orion 50mm guide scope and a ZWO ASI290MC camera and was directed by PHD2 auto-guiding software. Image acquisition was through Astrophotography Tool (APT) software. Post processing used Deep Sky Stacker software for stacking and alignment of frames and Pixinsight and Photoshop software for all other processing. Polar alignment for the evening was done through SharpCap Pro.
NGC 6888 The Crescent Nebula. A Tough Target Reworked
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.
(Source: Wikipedia.org)
Technical for This Image: NGC 6888, The Crescent Nebula, is a difficult target to capture. First, it is a faint nebula and requires a good number of exposures and integration time. Second, it is in a dense star field, so image processing to bring out the nebula's detail can also over-brighten the stars around the object. This image was captured with an Explore Scientific ED102 APO Refractor telescope. At the prime focus was a ZWO ASI294MC Pro camera set to 240 Gain and cooled to a temperature of -5C. Exposures were 140 x 45s each. Guiding was done through an Orion 50mm guide scope and a ZWO ASI290MC camera and was directed by PHD2 auto-guiding software. Image acquisition was through Astrophotography Tool (APT) software. Post processing used Deep Sky Stacker software for stacking and alignment of frames and Pixinsight and Photoshop software for all other processing. Polar alignment for the evening was done through SharpCap Pro.