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NGC 6946 in Cygnus



Scope: C8  f/6.3, Location: Laguna Mountains, CA,   30 May 2011  Camera: ST8300M

Exposure:  18 x 6 min UV/IR Block Luminance (2x2 bin),  8 x 4 min RGB exposures (3x3 bin).

Processing: Images were captured with CCDSoft. Aligned/stacked and dark subtracted in Astroart; Luminance exposures were flat fielded; Sigma Combine method was used for stacking subs.  All channels were scaled and equalized in Astroart.  Channels were co-registered in Astroart. G2V  factors  were applied to color channels in Astroart. Gradient removal was done in Astroart.  Level adjustments and curves were made on the Luminance data to bring out object features. Light noise reduction was applied to the background.  LRGB combine was done in Photoshop.   Layered Contrast Stretching was applied to the LRGB image. Final touches and color balance in Photoshop. Final Image size is approximately 2000x1500.

North is up in this image. NGC 6946 is significantly obscured by dust of our own Milky Way galaxy. It is also had 9 supernovas in recorded history. A recent is SN2004ET. It is no longer visible in this image but it can be seen in my 2005 image that can be seen in the Archives here.  The most recent supernova was in 2008. Its distance from Earth is estimated at 10 million light years. Horizontal FOV is  about 44'

Image Center approximately - Equatorial 2000: RA: 20h 34m 48s Dec: +6009'00" 


All images and content remain the property of Jim Thommes - copyright 2003 - 2012

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