The Crescent Nebula (NGC 6888) is an emission nebula in the constellation Cygnus, about 5000 light-years away from our planet. 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. (dixit Wikipedia)
To take this photo i used the following setup:
Scope: Newton Skywatcher 200/1000
Mount: AZEQ6
Camera: Atik One 6.0
The total exposure is around 9 hours over 3 nights in august 2016. As my camera is black & white i use Hubble color palette by stacking and mapping to RGB a combination of:
10 photos of 20 min flitering around Ha ray of Hydrogen
8 photos of 20 min filtering around OIII ray of Oxygen
8 photos of 20 min filtering around SII ray of Sulfur
I used the software Prism 10 to manage the capture, the pre-treatment (Removing offset, dark and flat). The stacking and the post-treatment was done with Pixinsight and at the end Photoshop.
I used the software Prism 10 to manage the capture, the pre-treatment (Removing offset, dark and flat). The stacking and the post-treatment was done with Pixinsight and at the end Photoshop.
Technical detail of the photo here: https://www.astrobin.com/259425
If you want more information, ask me in comment !
I hope you enjoyed it! If it is the case, resteem and follow me to see more astrophotography.
