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NGC  6946,  Spiral  Galaxy  in  Cepheus

     NGC 6946 is a medium-size face-on spiral galaxy in the constellation Cepheus close to the border with Cygnus. It appears 10-12 arcmin in diameter and has a relatively low surface brightness but a bright central core. During the last century NGC 6946  had four recorded supernovae, an unusually large number. It is 10-20 million light years distant.

 Date

 2003-07-28

 Scope

 RCOS Ritchey-Chretien 12.5 inch with Astro-Physics CCD Reducer at f/6.4 (nominal). 

 SBIG ST-10XME camera with CFW-8a color wheel; guided with the internal 

 guide chip.        

 Exposure

 Six 10-minute clear filter 1x1; six  5-min 2x2 RGB.

 Processing  

 Frames were acquired and color-combined in MaxIm. The luminosity master image was 

 processed with 3 iterations of CCDSharp's  Richardson-Lucy deconvolution. 

 The L and RGB layers were registered in RegiStar and then combined in PhotoShop.  

 Levels and curves were applied in Photoshop.

 

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