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I still have a few gremlins to sort out before Kielder, a bit of tilt that I can’t seem to track down and a weird spike effect in DEC that is causing it to guide slightly worse than in RA. Tonight I managed to get a quick two hours Ha on the Crescent Nebula. I’ve never imaged this area before and I’m surprised at how much nebulosity there is, a mosaic could be on the cards here.

The Crescent Nebula (NGC 6888 or Caldwell 27) is an emission nebula in the Cygnus constellation, 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

Camera: Atik 383L+ Mono with 1.25″ 7nm Baader Ha
Scope: Skywatcher Equinox 80 with Televue TRF-2008
Mount: EQ6 with EQMOD
Guiding: Orion ST80 with QHY5
Capture Software: CCD Commander, Maxim DL
Processing Software: Deep Sky Stacker, PixInsight
Exposures: Ha: 6 x 1200 secs (2 Hours), O3: 6 x 1200 secs (2 Hours)
Dithering: 1 pixel per sub
Calibration: 20 x Darks


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