Abell 21 - Medusa nebula - RGB with C2PU 1m Deltagraph (Jeffbax Velocicaptor)

Celestial hemisphere: Northern · Constellation: Gemini (Gem)

Abell 21 - Medusa nebula - RGB with C2PU 1m Deltagraph, Jeffbax Velocicaptor

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Abell 21 - Medusa nebula - RGB with C2PU 1m Deltagraph

Powered byPixInsight

Abell 21 - Medusa nebula - RGB with C2PU 1m Deltagraph

Hi everybody,

The Medusa Nebula (Abell 21) is a planetary nebula in the constellation of Gemini. As it is so large, its surface brightness is very low, with surface magnitudes of above 16.

This image (data from S.Brunier) was taken using the Sloan digital sky survey R filter which has a large band. G and B filters are "normal" Baader. Serge used the scope time between the Gaia alerts followed from the observatory.

I exceptionnaly used STARNET++ here tu isolate the background (I usually don't use IA) because it was noisy and the faint extensions at the top right were very hard to get from the red layer. Composition is R-RGB.

The Fwhm is about 2,5". Which is bad for this observatory. This object is not high on the horizon in France and the 5mn unguided images did not help. We usually use 1mn frames. But I find the nebula is very OK even if the stars are a bit big.

Hope you like this cosmic medusa.

CS

Original
Final
B

Fast Newtonians
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Astrophotographes (France)
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Abell 21 - Medusa nebula - RGB with C2PU 1m Deltagraph

Abell 21 - Medusa nebula - RGB with C2PU 1m Deltagraph

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Abell 21 - Medusa nebula - RGB with C2PU 1m Deltagraph

Abell 21 - Medusa nebula - RGB with C2PU 1m Deltagraph

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