Jellyfish Nebula (IC443 / Sh2-248) in Gemini: first narrowband image in SH(H-S) (Michele Vonci)

Celestial hemisphere: Northern · Constellation: Gemini (Gem) · Contains: Gem A · IC 443 · IC 444 · The star Propus (ηGem)

Jellyfish Nebula (IC443 / Sh2-248) in Gemini: first narrowband image in SH(H-S), Michele Vonci

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Jellyfish Nebula (IC443 / Sh2-248) in Gemini: first narrowband image in SH(H-S)

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Jellyfish Nebula (IC443 / Sh2-248) in Gemini: first narrowband image in SH(H-S)

A lot of first lights here: for the GT-81 and for the S and O narrowband filters! On top of that three clear(ish) nights in a row is something unheard of in Manchester (UK)!

Instead of my usual one-target-per-night approach, I then manage to engage in a mini SHO narrowband project with the Jellyfish nebula.

The main obstacle was the 3m tall wall on the south-west side of my backyard that only gave me about 1.5h per night, from 9 pm to 10.30 pm, before the nebula was too low to imaging; at some point, I even raised the tripod - including a full polar realignment - to gain some extra tens centimetres that allowed me to stay over the wall and take a few more images!

In the end, I managed to collect about 3.5 hours of total exposure in 5 minutes subs (1:20 hour for each Ha, S-II and 1h with the O III filter). The O III data is pretty much useless, too weak, so I ended up using only S-II and Ha data. I mapped R --> S-II, G --> Ha, and B --> [Ha - S].

Not sure about the physical meaning of assigning the B channel to the difference of Ha and S, I guess blue regions in the image are those where the difference between the Ha and S signal is larger than everywhere else!

From the results, it's clear that at least 10 minutes subs were needed, but it was the first attempt, so quite happy anyway!

Suburban Astrophotography
Imagers of Italy
UK Astro-Imaging
Cloudy Nights

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Jellyfish Nebula (IC443 / Sh2-248) in Gemini: first narrowband image in SH(H-S)

Jellyfish Nebula (IC443 / Sh2-248) in Gemini: first narrowband image in SH(H-S)

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Jellyfish Nebula (IC443 / Sh2-248) in Gemini: first narrowband image in SH(H-S)

Jellyfish Nebula (IC443 / Sh2-248) in Gemini: first narrowband image in SH(H-S)

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