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Home » Gallery » Nebula » Abell 21 Medusa Nebula

 

Location/ Date:

Eggersdorf, GER/ 21.+23.+25.+26.+27. March 2017

Telescope/ Lens

10" f/4 ONTC Newton

Mount:

Celestron CGE GPS

Camera:

Atik 383L+

Exposure time:

28x 1800" Astronomik Ha 6nm

23x 1200" Astronomik [OIII] 6nm

9x 300"  Astronomik RGB each

Total exposure

23,9 hours

Description: Abell 21, also known as the Medusa nebula lies in a distance of about 1500 light-years in the constellation of Gemini.
This planetary nebula was created by a sun-like star which is in a late stage of development of a star of this size and mass. As a result of thermonuclear processes in the centre of the star the outer shell of the star has been pushed off about 6800 years ago.
The remaining star is a white dwarf which is exiting the exausted gas hull to glow with its energy-rich UV radiation.
The name of the nebula reminds of Medusa‘s head of the Greek mythology which was known to have a fibrous structure.
   

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