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Lower's Nebula (Sh2-261) in Ha + RGB (Version 2), 


            Scott Davis
Lower's Nebula (Sh2-261) in Ha + RGB (Version 2)

Lower's Nebula (Sh2-261) in Ha + RGB (Version 2)

Technical card

Resolution: 2000x1651

Dates:Feb. 14, 2015Feb. 16, 2015Feb. 17, 2015Feb. 19, 2015Feb. 21, 2015Feb. 23, 2015

Astronomik 6nm Ha Clip-In Filter: 68x600" ISO1600
One-Shot Color: 41x300" ISO1600

Integration: 14.7 hours

Darks: ~22

Flats: ~40

Flat darks: ~40

Bias: ~40

Avg. Moon age: 14.58 days

Avg. Moon phase: 12.48%

Bortle Dark-Sky Scale: 6.33 job: 557075

RA center: 92.265 degrees

DEC center: 15.722 degrees

Pixel scale: 2.170 arcsec/pixel

Orientation: 179.949 degrees

Field radius: 0.782 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 2, which is identical to Version 1 except that Version 1 uses 5-minute subs for the Ha frames instead of the 10-minute subs used in this version.

Version 1 Link:



Scott Davis
License: Attribution-NonCommercial-NoDerivs Creative Commons

Sky plot

Sky plot


Lower's Nebula (Sh2-261) in Ha + RGB (Version 2), 


            Scott Davis