Hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  Filamentary nebula  ·  IC 1340  ·  Lace-work nebula  ·  NGC 6960  ·  NGC 6992  ·  NGC 6995  ·  Network nebula  ·  The star 31Vul  ·  The star 32Vul  ·  The star 52Cyg  ·  Veil nebula
Cygnus Loop (Ha + O3 + RGB), 


            Scott Davis
Cygnus Loop (Ha + O3 + RGB)
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Cygnus Loop (Ha + O3 + RGB)

Technical card

Imaging telescopes or lenses: Canon EF 200mm f/2.8L II USM

Imaging cameras: Canon EOS Rebel T3i

Mounts: Celestron CGEM Hypertuned

Guiding telescopes or lenses: Orion ShortTube 80

Guiding cameras: Orion StarShoot Autoguider

Software: Sequence Generator Pro  ·  DeepSkyStacker  ·  Photoshop CS6  ·  Scott Davis AAPPS

Filters: Astronomik 6nm Ha Clip-In Filter  ·  Astronomik 12nm OIII Clip-In Filter  ·  One-Shot Color

Dates:July 23, 2014July 25, 2014Aug. 16, 2014Aug. 17, 2014Aug. 18, 2014Aug. 22, 2014Aug. 24, 2014

Astronomik 12nm OIII Clip-In Filter: 278x180" (13h 54') ISO1600
Astronomik 6nm Ha Clip-In Filter: 140x300" (11h 40') ISO1600
One-Shot Color: 69x90" (1h 43' 30") ISO1600

Integration: 27h 17' 30"

Darks: ~30

Flats: ~50

Flat darks: ~50

Bias: ~50

Avg. Moon age: 25.18 days

Avg. Moon phase: 24.72%

Bortle Dark-Sky Scale: 6.29

Basic astrometry details

Astrometry.net job: 356463

RA center: 20h 51' 11"

DEC center: +29° 44' 31"

Pixel scale: 7.838 arcsec/pixel

Orientation: 90.091 degrees

Field radius: 3.912 degrees

Resolution: 620x409

Locations: My Backyard, Clovis, California, United States; Courtright Reservoir, Shaver Lake, California, United States


The Cygnus Loop is a supernova remnant from a start that is estimated to have exploded approximately 7,000 years ago. The vast amount of gasses from the explosion continue to expand out into space and will continue to do so for a very long time.

To be honest, I'm a bit underwhelmed with the way this turned out. First, some of the narrowband details are still faint due to the light pollution from my back yard. Either way, the image is finished, at least for now. It's still a pretty field of view.

RGB frames were captured from Courtright Reservoir. H-Alpha and Oxygen-III frames were captured from my backyard.


Sky plot

Sky plot


Cygnus Loop (Ha + O3 + RGB), 


            Scott Davis