Celestial hemisphere:  Northern  ·  Constellation: Gemini (Gem)  ·  Contains:  11 Gem  ·  12 Gem  ·  13 Gem)  ·  13 mu. Gem  ·  7 Gem)  ·  7 eta Gem  ·  Calx (μ Gem  ·  Gem A  ·  IC 443  ·  IC 444  ·  LBN 840  ·  LBN 841  ·  LBN 844  ·  LBN 845  ·  LDN 1564  ·  LDN 1565  ·  LDN 1566  ·  LDN 1567  ·  Part of the constellation Gemini (Gem)  ·  Praepes (η Gem  ·  Sh2-248  ·  Sh2-249  ·  Tejat Posterior  ·  Tejat Prior  ·  The star 12 Gem  ·  The star Propus  ·  The star Tejat
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IC443 The Jellyfish Nebula, George  Yendrey
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IC443 The Jellyfish Nebula

Getting plate-solving status, please wait...
IC443 The Jellyfish Nebula, George  Yendrey
Powered byPixInsight

IC443 The Jellyfish Nebula

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Description

This is my second attempt at imaging this object (IC443) and the first time in monochrome.  I came to this target much later than I had planned due to weather (as usual).  Over three nights (1/22/2023, 1/25/2023, and 2/4/2023) I managed to get enough data, particularly Oiii, that I felt like I could have a decent result.  Weather/clouds had resulting in my getting almost no Oiii and not that much Ha to balance the Sii.  

IC443 emits primarily in Ha and Sii, with very little Oiii, which makes getting a good amount of Oiii frames necessary to have it show up at all in the final image.

This was processed in a Hubble/SHO palette, channel combined and run through SPCC.  The RGB frames were used to create the star field separately from the narrow band nebula processing.
I used the GAME script in PixInsight to make a mask to allow me to work with just the dim region in the upper left, enhancing it to stand out a bit more.

I chose to go with a bit of a dramatic color implementation in contrast to the reality of primarily red/orange tones due to the Ha/Sii primary emission bands.  As a monochrome narrow band image, I found that there is much more flexibility in processing that there was in my original OSC/L'Extreme rendition a year ago.

One big benefit of the monochrome imaging is that star bloom/star halos are just about non-issues compared to the infamous halos that are prevalent with the Optolong OSC Dual band L'Extreme filters.  Narrowband also results in significantly less noise issues, IMO.

I hope you enjoy and please let me know what you think of this rendition of The Jellyfish Nebula!!!

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IC 443 (also known as the Jellyfish Nebula and Sharpless 248 (Sh2-248)) is a galactic supernova remnant (SNR) in the constellation Gemini. On the plane of the sky, it is located near the star Eta Geminorum. Its distance is roughly 5,000 light years from Earth.IC 443 may be the remains of a supernova that occurred 3,000 - 30,000 years ago. The same supernova event likely created the neutron starCXOU J061705.3+222127, the collapsed remnant of the stellar core. IC 443 is one of the best-studied cases of supernova remnants interacting with surrounding molecular clouds.

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IC443 The Jellyfish Nebula, George  Yendrey