IC443 The Jellyfish and Environs in Ha (Michael Feigenbaum)

IC443 The Jellyfish and Environs in Ha

Here we have the Jellyfish nebula IC443 in Gemini.

I'm continuing to work with this FRA400 72mm quintuplet and figure this was a good target for its wide-field, especially with the 0.7x reducer.

I am usually a shorter exposure imager but after doing some reading and thinking, I thought I would try to do some much longer subs to see what I could learn. I went with 10-minute subs with an 7nm Ha filter with this image. I was concerned about transient events (airplanes, etc) killing some frames but I was pleasantly surprised that out of the 47 frames I was able to make, I only had to toss a few. Still, I am plagued with halos. Not sure of what the cause is and i'm beginning to think it might be a result of fast optics. In any case, I believe I will eventually figure it out.

I decided to post this one as a monochrome image as I don't think I will be having much time to do imaging in the coming weeks but I think this subject is one that is pleasing in monochrome.

I like to use "starnet++" for masks. When I used it to make a maks I intended to use for LHT, I was somewhat startled at how interesting this looked devoid of stars. So I decided to put a little work into a starless version as well.

Lastly, on the starless versions, I also tried to use Topaz as a tool as well. I found that even the smallest adjustments of the sliders had a rather large effect on the image and limited both the NR and sharpening to 1.

Anyway, I hope you like it and as always, comments/criticism welcomed!

Final
Original
G
H
J

G

Description: Small application of Topaz = 1 NR, 1 Sharpening

Uploaded: ...

H

Description: Small application of Topaz - 1 NR, 1 Sharpening.

Uploaded: ...

J

Description: Screenshot of stacked image and FWHMEccentricity tool output

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	4022951
PixInsight job	0L3TYQ9NOZ87FDY36RMAMLCRTDVO57UD
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	06h20m00s.53
RA (top/left)	06h25m52s.15
RA (top/right)	06h13m08s.17
RA (bottom/right)	06h14m17s.20
RA (bottom/left)	06h26m49s.93

Dec (center)	+23°00′44″.7
Dec (top/left)	+24°15′13″.3
Dec (top/right)	+23°55′20″.8
Dec (bottom/right)	+21°45′46″.8
Dec (bottom/left)	+22°04′40″.9

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