The Jellyfish Nebula (IC 443, Sharpless 248) is a supernova remnant located in the constellation
Gemini. It lies at an approximate distance of 5,000 light years from Earth and has an apparent magnitude of 12. The nebula can be found between the stars
Mu and
Eta Geminorum, at the foot of one of the celestial
Twins.
The Jellyfish Nebula is a remnant of a supernova that occurred in the Milky Way between 3,000 and 30,000 years ago. The supernova event produced the nebula and the neutron star CXOU J061705.3+222127. The presence of the neutron star and the nebula’s location in a star forming region indicate that the remnant was created by a Type II supernova, one triggered by a rapid collapse of a star with a mass at least 8 times that of the Sun. The neutron star is moving away from the site at about 800,000 km/h.
I imaged this way back in January 2015 with my QSI583/GT81 combo and ended up with a weird looking blue and gold HA and SII bi-colour, pre-processed in Pixinsight but post processed in Photoshop, I knew very very little about Pixinsight back then.
Jellyfish and IC444 2 Panel Ha & SII bi-colourFast forward to December 2023 and thought it was time it had a bit of a refresh, now I have more experience with Pixinsight, although I've not spent as much time as I'd like on it.
As it's been almost 9 years since imaging this I thought I would post as a new image rather than a revision.
It's not been an easy one to process, I've been messing with this for quite a while (about a month or so on and off, was getting fed up with it) lots of calibration issues, vignetting being introduced was one of them, eventually found the problem, even though I was using the original master dark/bias/flat etc! it seems the latest Pixinsight wasn't happy with it, I loaded in the original calibration frames and re-made the masters and that worked a treat.
So hopefully this isn't too bright on your eyes
5 Hours per filter per panel making up the 30 hours.
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