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Getting plate-solving status, please wait...
Sh2-274 (Medusa nebula), 


            Joel Shepherd
Sh2-274 (Medusa nebula)

Sh2-274 (Medusa nebula)

Technical card

Imaging telescope or lens:EdgeHD 8

Imaging camera:Atik 460EX Mono

Mount:Astro-Physics Mach1GTO

Guiding telescope or lens:EdgeHD 8

Guiding camera:Lodestar X2

Software:PixInsight 1.8Sequence Generator Pro

Filters:Astrodon 5nm H-alphaAstrodon 5nm Olll


Resolution: 1280x1121

Dates:Jan. 13, 2019Jan. 14, 2019

Astrodon 5nm H-alpha: 20x600" bin 1x1
Astrodon 5nm Olll: 7x600" bin 1x1

Integration: 4.5 hours

Avg. Moon age: 7.13 days

Avg. Moon phase: 47.35%

Bortle Dark-Sky Scale: 6.00 job: 2567522

RA center: 112.259 degrees

DEC center: 13.250 degrees

Pixel scale: 0.746 arcsec/pixel

Orientation: 110.214 degrees

Field radius: 0.176 degrees

Locations: Home, Seattle, WA, United States

Data source: Backyard


This object is my white whale. Rarely seen, and something always goes haywire when I try to image it. In this case, very heavy dew finally overwhelmed the SCT's dew shield and dew heater, so I didn't get as much O-iii as I wanted, and focus on both was dubious. It's a beautiful target though ... looking forward to a chance to take another crack at it in a few years.



Joel Shepherd
License: Attribution Creative Commons

Sky plot

Sky plot


Sh2-274 (Medusa nebula), 


            Joel Shepherd