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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.
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Date |
2003-07-28 |
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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. |
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Exposure |
Six 10-minute clear filter 1x1; six 5-min 2x2 RGB. |
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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. |