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Lower's Nebula (Sh2-261) in Ha + RGB (Version 1), 


            Scott Davis
Lower's Nebula (Sh2-261) in Ha + RGB (Version 1)

Lower's Nebula (Sh2-261) in Ha + RGB (Version 1)

Technical card

Resolution: 2400x1818

Dates:Feb. 9, 2015Feb. 12, 2015Feb. 14, 2015

Astronomik 6nm Ha Clip-In Filter: 116x300" ISO1600
One-Shot Color: 41x300" ISO1600

Integration: 13.1 hours

Darks: ~17

Flats: ~40

Flat darks: ~40

Bias: ~40

Avg. Moon age: 22.23 days

Avg. Moon phase: 49.12%

Bortle Dark-Sky Scale: 5.67 job: 544698

RA center: 92.268 degrees

DEC center: 15.707 degrees

Pixel scale: 1.792 arcsec/pixel

Orientation: 179.960 degrees

Field radius: 0.750 degrees

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


Lower's Nebula, catalogued as Sh2-261 or LBN 863, is a large hydrogen emission nebula located in the constellation Orion. Its distance from Earth is estimated to be approximately 3,260 light years.

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

This is Version 1, which is identical to Version 2 except that Version 2 uses 10-minute subs for the Ha frames instead of the 5-minute subs used in this version.

Version 2 Link:



Scott Davis
License: Attribution-NonCommercial-NoDerivs Creative Commons

Sky plot

Sky plot


Lower's Nebula (Sh2-261) in Ha + RGB (Version 1), 


            Scott Davis