Home > Uncategorized > IC443, The Jellyfish Nebula

IC443, The Jellyfish Nebula

This galactic jelly isn’t even mentioned in most star atlases, despite being huge (almost a degree across) and easily locatable in the constellation Gemini. It’s probably an extremely difficult visual object, but astroimagers are quite familiar with it because of its distinct shape.  IC443 is a supernova remnant that exploded thousands of years ago, and the filaments you see are the interaction of shock waves from that supernova with surrounding gases.

This is another narrowband image, representing a total of 11 hours of exposures taken over two nights (26-7 Feb).  I’ve used color to emphasize the regions where there is a lot of Hydrogen alpha emission alone (red) from where there is a combination of Oxygen-III and Hydrogen-alpha (green-yellow).

I can’t help but think that the Jellyfish is going to eat the bright star, Eta Geminorium…

The Jellyfish Nebula, IC443

Image data:

Exposures:  25 x 600s Ha, 21 x 600s O-III, 20 x 600s S-II, a total of 11h 0m

Software:  guiding by PHD, stacking in DeepSkyStacker, processing in Photoshop CS3

Telescope:  Televue NP101, 530mm f/5.3

Camera:  SBIG ST-8300M with Baader narrowband filters

Mount:  CGEM

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