Jellyfish nebula (David Koslicki)

Celestial hemisphere: Northern · Constellation: Gemini (Gem) · Contains: Gem A · IC 443 · LBN 844 · Sh2-248

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Jellyfish nebula

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Jellyfish nebula

I tried quite hard to pull out the OIII in this image, which was a challenge considering that all three emission bands appear to be right on top of each other. In fact, I originally wanted to use as "faithful" a color palette as I could (Ha=red, SII=deep red, OIII=blue/green), but the Ha and SII were basically right on top of each other so everything came out just red. So I stuck with that (Ha + SII = red, OIII=blue/green) and the added in the RGB stars.

This image was captured over many nights:
12/13/21
12/14/21
12/21/21
1/8/21
3/11/22
3/15/22
3/16/22
3/17/22
3/18/22
3/20/22
3/21/22
3/30/22
4/11/22
4/13/22
This was due to: my OIII, SII, and RGB filters not arriving until February, poor weather, and (later in the year) this target dipping below the trees. Some nights I only ended up with a couple of frames. In any case, it was worth it! I'll probably take another pass at the RGB at some point due to missing stars in the corners due to image train rotations over the months.

I captured a total of 269 subs, but only about 190 made it into the stack due to one reason or another.

----------------------------------------------
update:
I completely forgot to rotate the image, so I deleted the previous upload and replaced it with this one that is oriented to look more like a real jellyfish

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Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
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Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Advanced success
Started	...
Astrometry.net job	5684891
PixInsight job	EXT0SICXT140UZX6RHJEONUYOCFGMI5M
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	06h16m46s.184
RA (top/left)	06h18m20s.229
RA (top/right)	06h18m25s.663
RA (bottom/right)	06h15m11s.553
RA (bottom/left)	06h15m07s.372

Dec (center)	+22°32′15″.50
Dec (top/left)	+22°04′11″.92
Dec (top/right)	+22°59′20″.66
Dec (bottom/right)	+23°00′15″.67
Dec (bottom/left)	+22°05′05″.60

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