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The Cave Nebula (Ha + RGB), 


            Scott Davis
The Cave Nebula (Ha + RGB)

The Cave Nebula (Ha + RGB)

Technical card

Resolution: 2000x1240

Dates:Aug. 5, 2015Aug. 11, 2015Aug. 12, 2015Aug. 14, 2015Nov. 6, 2015

Astronomik 6nm Ha Clip-In Filter: 65x600" ISO1600
One-Shot Color: 20x300" ISO1600

Integration: 12.5 hours

Darks: ~15

Flats: ~40

Flat darks: ~40

Bias: ~40

Avg. Moon age: 25.76 days

Avg. Moon phase: 20.91%

Bortle Dark-Sky Scale: 6.33 job: 837664

RA center: 22h 54' 6"

DEC center: +62° 26' 56"

Pixel scale: 3.148 arcsec/pixel

Orientation: 178.619 degrees

Field radius: 1.029

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


The Cave Nebula, catalogued as Sharpless 2-155 or Cardwell 9, is a very faint emission nebula in the constellation Cepheus. While extremely difficult visually in the best of telescopes, the pockets of gas, dust lanes, and even an area of reflection nebula make for a beautiful photographic target. Its distance is estimated to be approximately 2,400 light years from Earth.

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



Scott Davis
License: Attribution-NonCommercial-NoDerivs Creative Commons

Sky plot

Sky plot


The Cave Nebula (Ha + RGB), 


            Scott Davis