Imaging telescopes or lenses: Celestron 11" Edge HD
Imaging cameras: ZWO ASI 1600MM Pro
Mounts: SkyWatcher EQ8-R Pro
Guiding cameras: ZWO ASI174MM mini
Focal reducers: Celestron 0.7x EdgeHD 1100 Reducer
Software: PHD2 Guiding v2.9 dev · Photoshop CC · Astro Pixel Processor · PixInsight 1.8.8 · Sequence Generator Pro
Filters: Astrodon OIII 1.25" 3nm · Astrodon Ha 1.25" 5nm · Astrodon Gen 2 E-series 1.25" Green · Astrodon Gen 2 E-series 1.25" Blue · Astrodon Gen 2 E-series 1.25" Red
Accessory: ZWO EFW · Celestron Off-Axis Guider · MoonLite 2.5 inch Crayford EDGE Focuser · MoonLite High Res Stepper Focuser
Dates:Jan. 19, 2021 , Jan. 21, 2021 , Feb. 7, 2021
Frames:
Astrodon Gen 2 E-series 1.25" Blue: 25x120" (gain: 76.00) -20C bin 1x1
Astrodon Gen 2 E-series 1.25" Green: 25x120" (gain: 76.00) -20C bin 1x1
Astrodon Gen 2 E-series 1.25" Red: 25x120" (gain: 76.00) -20C bin 1x1
Astrodon Ha 1.25" 5nm: 261x180" (gain: 139.00) -20C bin 1x1
Astrodon OIII 1.25" 3nm: 234x180" (gain: 139.00) -20C bin 1x1
Integration: 27.2 hours
Darks: ~25
Flats: ~25
Flat darks: ~25
Avg. Moon age: 13.05 days
Avg. Moon phase: 37.81%
Bortle Dark-Sky Scale: 4.00
Astrometry.net job: 4251819
RA center: 7h 28' 57"
DEC center: +13° 17' 47"
Pixel scale: 0.411 arcsec/pixel
Orientation: 89.335 degrees
Field radius: 0.323 degrees
Resolution: 4549x3371
Locations: DogStar Observatory, Lovettsville, VA, United States
Data source: Backyard
The Medusa Nebula (Abell 21; Sharpless 274) is an old planetary nebula some 1,500 light-years away along the southern border of the constellation Gemini. The planetary nebula phase represents a final stage in the evolution of low mass stars like the sun as they transform themselves from red giants to hot white dwarf stars and in the process shrug off their outer layers. The Medusa Nebula is estimated to be over 4 light-years across. (APOD)
Taken over several nights: Jan 19, 21, 23; Feb 5, 6, 8, 16 and 23, 2021.
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