Hemisphere:  Northern  ·  Constellation: Gemini (Gem)
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Abell 21, the Medusa Nebula in SHO, 



    
        

            Frank Zoltowski
Abell 21, the Medusa Nebula in SHO
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Abell 21, the Medusa Nebula in SHO

Getting plate-solving status, please wait...
Abell 21, the Medusa Nebula in SHO, 



    
        

            Frank Zoltowski
Abell 21, the Medusa Nebula in SHO
Powered byPixInsight

Abell 21, the Medusa Nebula in SHO

Technical card

Imaging telescopes or lenses: Astro-Physics AP155EDFS

Imaging cameras: QHY22

Mounts: Losmandy Titan

Guiding telescopes or lenses: Astro-Physics AP155EDFS

Guiding cameras: QHY5L-II Mono

Software: Sequence Generator Pro  ·  PixInsight  ·  Open PHD PHD 2

Filters: Astrodon 3nm OIII  ·  Astrodon Ha 5nm Ha 5nm  ·  Astrodon 5 nm SII

Accessory: Orion Thin OAG  ·  Xagyl Filter USB Wheel Xagyl FW8125  ·  usbFocus Stepper Motor and Controller


Frames:
Astrodon 3nm OIII: 12x1200" (4h) -25C bin 1x1
Astrodon 5 nm SII: 12x1200" (4h) -25C bin 1x1
Astrodon Ha 5nm Ha 5nm: 12x1200" (4h) -25C bin 1x1

Integration: 12h


Basic astrometry details

Astrometry.net job: 600439

RA center: 7h 29' 0"

DEC center: +13° 15' 18"

Pixel scale: 0.843 arcsec/pixel

Orientation: -0.353 degrees

Field radius: 0.375 degrees


Resolution: 2490x2013

Locations: Tebbutt Observatory, Edgewood, New Mexico, United States

Data source: Backyard

Description

The Medusa Nebula , also known as Abell 21 and Sharpless 274, in SHO palette. It is a large planetary nebula discovered by George Abell. While Abell classified it as an old planetary nebula, its filamentary structure led it to be believed to be a supernova remnant. However, later measurement of the expansion velocities classified it as a planetary.

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Sky plot

Sky plot

Histogram

Abell 21, the Medusa Nebula in SHO, 



    
        

            Frank Zoltowski