James Janusz 2000 thru 2018 All Rights Reserved
Telescope: Takahashi FSQ Designation: 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 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.
Mount: Astro-Physics AP1600 GTO Constellation: Cygnus
Camera: Apogee U16M 16803 with Astrodon Ver. 2 Filters Remotely Imaged With CCD Commander
Guiding:SBIG ST402 Guider Type: Emission Nebula
Exposure Data: Ha OIII Bi-Color 11.5 Hours each. Position: R.A. 20 hr 12 min , Dec +28 21
Processed using Maxim data aquisition, PixInsight and PhotoShop image processing Date: June 2017
Data Acquisiton, Reduction and Processing by Jim Janusz Imaging Location: Cave Creek Canyon Observatory