SaratogaSkies Jim Solomon's Astropics


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NGC 6992 (Network Nebula)

[Hα+R G B]

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Image Details:

Camera: Mofidied Canon Rebel XT (350D): Hutech Type I Filter Replacement
Mount: Celestron AS-GT
Scope: Celestron C8-N (8" f/5 Newtonian)
Configuration: Prime Focus
Additional Optics: Celestron/Baader Multi Purpose Coma Corrector (MPCC)
Filter: Hutech Hα Front Filter (HA-FF)
Effective Focal Length: 1000mm
Effective Focal Ratio: f/5
Exposure: 32 x 8min @ ISO 400 (RGB), 32 x 8min @ ISO 1600 (Hα)
Total Exposure: 8hrs, 32min
Date: 9/21/2006 (RGB); 9/22/2006 (Hα)
Location: Saratoga, CA, USA
Acquisition: DSLRfocus
Focus: DSLRFocus
Dithering: GADFly 1.0.5
Guiding: GuideDog via Philips ToUcam Pro II (840k) through Orion ST80 w/ Celestron 2x "Kit" Barlow


  • IRIS: Dark subtraction, registration, gradient removal
  • JimP: Flat field, Kappa-Sigma Stacking, White balance, HαRGB combination, ASINH stretching
  • Photoshop: Levels, cropping, sharpening, JPG conversion
  • Neat Image: Noise reduction

Image Description:

This is NGC 6992, aka the Network Nebula and the Eastern portion of the Veil Nebula, a supernova remnant in the constellation of Cygnus. This image consists of 4+ hrs of RGB exposure and 4+ hrs of Hα exposure over two nights. See my recent NGC 6960 image for more details on processing. Also, for grins, check out my previous attempt. A higher-resolution image is also available. North is left.