Hemisphere:  Northern  ·  Constellation: Gemini (Gem)  ·  Contains:  PK205+14.1  ·  Sh2-274
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Medusa Nebula, 



    
        

            James E.
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Medusa Nebula

Getting plate-solving status, please wait...
Medusa Nebula, 



    
        

            James E.
Powered byPixInsight

Medusa Nebula

Technical card

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: Celestron Off-Axis Guider  ·  ZWO EFW  ·  MoonLite 2.5 inch Crayford EDGE Focuser  ·  MoonLite High Res Stepper Focuser


Dates:Jan. 19, 2021Jan. 21, 2021Feb. 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

Description

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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