Wikipedia describes this object as follows: "The Crescent Nebula is an emission nebula in the constellation Cygnus, about 5000 light years away. 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 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."
Below is my narrowband exposure of Crescent Nebula represented in Ha:sG:OIII palette. Synthetic green channel sG was generated from Ha and OIII using
Noel Carboni Astronomy Tools. Click for larger image!
Details of imaging: total exposure 260min = 4h 20min.
- Ha: 9x20min (bin1x1)
- OIII: 4x20min (bin 2x2)
Equipment:
- Imaging scope: Ikharos 102mm F7 ED doublet with 0.8x reducer / flattener
- Focal length: 572mm, F/5.6
- Camera: SBIG ST-8300M @ -20C
- Filters: Baader 2 inch SII, Ha and OIII filters
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