NGC6820 and NGC6823 in Vulpecula


Scope: C8 f/2.8; Location: Dos Picos Park, Ramona 6, Aug 2004; Camera: ToUcam SC3. 

Exposure: 15 x 6 sec and 12 x 36 sec Luminance exposures with Baader IR Block Filter; 6  x 300 sec H-Alpha exposure, 12 x 12 sec RGB 

Processing: All exposures captured in K3CCDTools. Alignment and stacking was done with Registax and saved as FITs. HA, and LRGB channels were co-registered in Astroart. Artificial flat fielding of each channel was done in Astroart as well as final scaling and rough color balance. The two IR exposures were combined for star field with the shorter exposure used to reduce star bloating (normal combine with mask). The Nebulosity was extracted from HA and then combined with the IR  for Luminance. HA and Red combined for red. These combinations were done in Photoshop. Final LRGB combine was done in Photoshop using Luminance Layering (or LLRGB). Color balance was done in Photoshop. SGBNR was used for background noise reduction.

This image is NGC6823 and NGC 6820. They  are hard to separate as distinct objects; NGC6823 is the star cluster roughly centered in the image. NGC6820 is the Nebula. This is a guided image. The H-Alpha exposures help to bring out the contrast in the nebula. When mixed in the red color channel for the color composite the Nebula comes out somewhat monochromatic. Horizontal FOV is 30'


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