The Cocoon Nebula (Ha + RGB), 


            Scott Davis

The Cocoon Nebula (Ha + RGB)

Technical card

Imaging telescopes or lenses: Explore Scientific ED102 APO

Imaging cameras: Canon EOS Rebel T3i

Mounts: Celestron CGEM Hypertuned

Guiding telescopes or lenses: Orion ShortTube 80

Guiding cameras: Orion StarShoot Autoguider

Focal reducers: Astro-Tech AT2FF

Software: Sequence Generator Pro  ·  DeepSkyStacker  ·  Photoshop CS6

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

Accessory: Robofocus

Dates:Oct. 6, 2015Oct. 9, 2015Nov. 6, 2015

Astronomik 6nm Ha Clip-In Filter: 62x600" ISO1600
One-Shot Color: 25x300" ISO1600

Integration: 12.4 hours

Darks: ~15

Flats: ~40

Flat darks: ~40

Bias: ~40

Avg. Moon age: 24.97 days

Avg. Moon phase: 22.56%

Bortle Dark-Sky Scale: 5.67

Basic astrometry details job: 837862

Resolution: 620x412

Locations: My Backyard, Clovis, California, United States; Big Stump, Kings Canyon National Park, CA, United States


The Cocoon Nebula, catalogued as IC 5146, Sharpless 2-125, and Caldwell 19, is a beautiful emission and reflection nebula in the constellation Cygnus. It lies at a distance of approximately 3,300 light years from Earth. In addition to the beautiful emission nebula itself, this field of view also captures Barnard 168, a dark nebula seen forming a beautiful trail to the right of the Cocoon.

RGB data was captured from Big Stump in Kings Canyon National Park; Hydrogen-Alpha data was captured from my backyard in Clovis, California.



The Cocoon Nebula (Ha + RGB), 


            Scott Davis