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NGC 6781 in Aquila



Scope: C8  f/8 Location: Del Mar, CA   27 September 2005  Camera: Artemis285

Exposure: 6 x 300 sec H-Alpha (1x1), 12 x 120 sec Baader IR  Block Filter (1x1), 10 x 60 sec RGB Exposures (2x2).

Processing: Images were captured  with Artemis Capture (as FITs).  Aligned/stacked in Registax 3 and saved as FITS. Luminance (IR Block),  H-Alpha, and Color channels were scaled and rough color balanced in Astroart. Channels were co-registered in Astroart.  The H-Alpha exposure was the main exposure for the luminance construction. The 120 second IR Block exposure data was mainly used to enhance star depth on the luminance construction ( Blended background stars with the HA exposure data.)  Final LRGB combine was done in Photoshop using Luminance Layering (or LLRGB).  Color balancing and final touches were done in Photoshop.  Selective sharpening was done to enhance contrast using the Don Waid method. SGBNR was used to smooth background noise on the final result.  Final Image size is approximately 1392x1040.

All exposures in this image were guided; North is up in this image. NGC 6781 is a planetary Nebula in the constellation of Aquila. It is a gas shell thrown off by the nova of the central star. The central star is the small blue star located in the center of the gas bubble. Horizontal FOV is 19' 

Image center is located approximately - Equatorial 2000: RA: 19h 18m 28s Dec: +0632'25"


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

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