"Cirrus Nebula NW" in Cygnus, NGC6979, NGC6974



Scope: Megrez II at f/3.8,  Location: Dos Picos Park, Ramona, CA   15 July 2006,   Camera: Artemis285

Exposure: 8 x 360 sec H-Alpha (1x1),  5 x 180 sec IR/UV Block Filter (1x1), 8 x 120 sec RGB Exposures (2x2). 

Processing: Images were captured  with Artemis Capture (as FITs).  Aligned/stacked in Registax 3 and saved as FITS. Luminance,  H-Alpha, IR/UV Block,  and Color channels were scaled and  color balanced in Astroart. Channels were co-registered in Astroart.  Curves and Levels applied in Photoshop to optimize object features. Final LRGB combine was done in Photoshop using Luminance Layering (or LLRGB) - G2V calibration factors and Atmospheric Extinction factors were applied.  Stars got somewhat big so a minimum filter was applied (50% fade) with nebula masked off. Selective sharpening was applied to nebula features in Photoshop with a layer mask.  SGBNR was used to smooth background noise on the final image.  Final Image size is approximately 1392x1040.

All exposures in this image were guided; North is to the Left in this image. The prominent object is sometimes known as Pickering's triangle. This region is part of the Cygnus Loop - a larger complex that is really a super nova remnant. The object is catalogued as NGC 6979 and the object in the lower left is NGC6974. Distance estimates vary but the approximate distance from Earth is about 2,600 light years. The Horizontal FOV is 100'.

Image center is located approximately - Equatorial 2000: RA: 20h 50m 23s Dec: +3121'11"


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