Tuesday, November 1, 2011

NGC 6888 Crescent Nebula

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

No comments:

Post a Comment