NGC281, The PacMan Nebula in Cassiopeia

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Date   09/26/2006,10/16/2006,10/19/2006,10/20/2006,10/29/2006
Conditions   20.31 mags/sq arcsec at zenith (19.3 when Hα collected)
Scope   Vixen VC200LDG @ f/6.4
Filters   Baader UV-IR Cut, Baader 7nm Hα
Camera   Canon 350D (IR modified)
Exposure   37x5min ISO800; 45x3min ISO1600; 9x20min ISO1600 Hα (5 hours RGB; 3 hours Hα)
Processing   ImagesPlus 2.8 raw conversion, dark/flat/bias calibration, stacking, DDP, star reduction; PS CS2, curves, Hi-pass; Noel's Actions, soft color gradient;
Notes   This is my first attempt at narrow-band imaging using the Baader Hα filter. The filter has a 7nm bandwidth centered on the 656nm wavelength of Hα emissions. NGC281 emits enormous amounts of light at this frequency thanks to the excitation of hydrogen gas in this star formation region. I combined this narrow band data with standard RGB data by using the HαR:G:B blending technique described by Rob Gendler in this article.
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