Abell 21 (PK205 +14.1) Medusa Planetary Nebula in Gemini

Abell21 (PK 205 +14.1) is a pretty large (12 arc-minutes) Planetary Nebula,situated in the constellation of Gemini.Its real distance is about 1500 light-years.It was detected in 1955 by George Abell and Hugh M.Johnson.

For its special looking filamentary structure it is nick-named as Medusa Nebula,resembling her wounderfull  hairs.

Abell 21 earlier was discussed to be a SNR,but Soviet astronomers reveilled in the 1970ies its real nature by measuring the expansion velocities and the thermal character of the radio emissions.



position (epoch 2000):

RA.: 07h 29m 02,7s
Decl.: +13° 14′ 48″


image data:

LRGBHaOIII image from:

L= 12x1200s




a total of 17.3 hours

80cm f/7 AstroOptik Keller corrected cassegrain FLI Proline 16803 Astrodon LRGB GenII filters

Prompt 7 CTIO/UNC Chile,remote controlled

image processing: Bernd Flach-Wilken


here you have a picture of the Medula Nebula in a 94% FOV of the used FLI-camera.

For full resolution click HERE.

HERE is a link to a very detailed image,taken with one of the VLT-(ESO)-telescopes.






Last modified on Tuesday, 14 January 2020 15:36

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