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Sh2-274 (Medusa nebula), 


            Joel Shepherd
Sh2-274 (Medusa nebula)

Sh2-274 (Medusa nebula)

Technical card

Resolution: 1280x994

Dates:Jan. 23, 2017Jan. 31, 2017Feb. 1, 2017

Astrodon 5nm H-alpha: 9x600" -20C bin 1x1
Astrodon 5nm Olll: 9x600" -20C bin 1x1

Integration: 3.0 hours

Avg. Moon age: 11.12 days

Avg. Moon phase: 17.90%

Bortle Dark-Sky Scale: 6.00 job: 1438386

RA center: 7h 29' 8"

DEC center: +13° 15' 57"

Pixel scale: 1.982 arcsec/pixel

Orientation: 71.938 degrees

Field radius: 0.446

Locations: Home, Seattle, WA, United States

Data source: Backyard


Subject: Sh2-274 (Medusa nebula) in Gemini. Once thought to be a supernova remnant, is now considered to be a planetary nebula, albeit a large one. Roughly 1500 light-years distant and 4 light-years across.

Capture notes: Taken under what is passing for clear skies in Seattle this winter: almost continuous thin clouds passed overhead while I was taking lights, particularly the Ha lights.

Processing notes: This is an HOO combination, with O-iii boosted in the blue channel. The clouds added a fair amount of noise which I finally decided to make peace with. Did a fair amount of reduction on it, but wanted to pull up some of the fainter detail as well which was just above the noise level: some extra graininess seemed to be the price.



Joel Shepherd
License: Attribution Creative Commons

Sky plot

Sky plot


Sh2-274 (Medusa nebula), 


            Joel Shepherd

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Narrowband imaging