NGC6820 and NGC6823 in Vulpecula



Scope: C8 at f/3.3,  Location: Blair Valley, Anza Borrego Desert, CA   23 September 2006,   Camera: Artemis285

Exposure: 5 x 480 sec H-Alpha (1x1),  5 x 120 sec IR/UV Block Filter (1x1), 5 x 90 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.  Central Gradient removal was done in Astroart. Curves and Levels applied in Photoshop to optimize object features. Luminance construction consisted of the H-Alpha exposure mixed with the IR/UV Block exposure. Final LRGB combine was done in Photoshop using Luminance Layering (or LLRGB) - G2V calibration factors and Atmospheric Extinction factors were applied.  Photoshop Surface blur was lightly applied . Selective sharpening was applied to nebula features in Photoshop with a layer mask.  Final Image size is approximately 1392x1040.

All exposures in this image were guided; North is up in this image. The star cluster in the center of the image is NGC 6823. The surrounding emission nebula is cataloged as NGC 6820. These object are located in the constellation of Vulpecula. This image replaces and earlier image that can be seen in the Archives here . The Horizontal FOV is 46'.

Image center is located approximately - Equatorial 2000: RA: 19h 43m 22s Dec: +2317'34"


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