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Contains:  NGC 2395
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Abell21 HaLRGB, 





    
        

            Sergiy_Vakulenko
Abell21 HaLRGB

Abell21 HaLRGB

Technical card

Resolution: 2800x2200

Dates:April 30, 2019

Frames:
Baader Blue 36 mm: 31x300" bin 1x1
Baader Green 36 mm: 20x300" bin 1x1
Baader Luminance 36 mm: 35x600" bin 1x1
Baader Red 36 mm: 18x300" bin 1x1
Baader Ha 7nm 36mm: 28x900" bin 1x1

Integration: 18.6 hours

Avg. Moon age: 25.33 days

Avg. Moon phase: 18.68%

Astrometry.net job: 3055166

RA center: 7h 29' 7"

DEC center: +13° 14' 42"

Pixel scale: 2.141 arcsec/pixel

Orientation: 355.515 degrees

Field radius: 1.059

Locations: Remote observatory, Kiev, Ukraine

Data source: Own remote observatory

Remote source: Non-commercial independent facility

Description

The Medusa Nebula is a large planetary nebula in the constellation of Gemini on the Canis Minor border. It is also known as Abell 21 and Sharpless 2-274. It was originally discovered in 1955 by UCLA astronomer George O. Abell, who classified it as an old planetary nebula. The braided serpentine filaments of glowing gas suggests the serpent hair of Medusa found in ancient Greek mythology.

Until the early 1970s, the Medusa was thought to be a supernova remnant. With the computation of expansion velocities and the thermal character of the radio emission, Soviet astronomers in 1971 concluded that it was most likely a planetary nebula.

As the nebula is so big, its surface brightness is very low, with surface magnitudes of between +15.99 and +25 reported.
(c) Wikipedia

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Author

Sergiy_Vakulenko
Sergiy_Vakulenko
License: Attribution Creative Commons
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    Abell21 HaLRGB, 





    
        

            Sergiy_Vakulenko
    Original
  • Abell21 HaLRGB, 





    
        

            Sergiy_Vakulenko
    B

B

Pure Ha

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Abell21 HaLRGB, 





    
        

            Sergiy_Vakulenko