Jellyfish Nebula (Roger Nichol)

Celestial hemisphere: Northern · Constellation: Gemini (Gem) · Contains: 11 Gem · 12 Gem · 13 mu. Gem · 7 eta 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) · Sh2-248 · Sh2-249 · Tejat Posterior · Tejat Prior · The star Propus (ηGem) · The star μGem

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Jellyfish Nebula

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Jellyfish Nebula

The Jellyfish Nebula, IC443.

Imaged using two dual-narrowband filters on an OSC, with Ha, Sii, and Oiii extracted from the two stacks of 1200s exposures and recombined in a variant of SHO. The star colours came from a separate stack of 60s exposures using a wideband filter.

I found this quite challenging to edit, trying to keep the faint blue Oiii contributions and discriminate between the concentrations of Sii and Ha. This wasn't helped by the moon that was fairly close to the target and those two big stars that were completely blown out in the long exposures.

ZWO ASI 2600MC PRO
Optolong L-eXtreme filter

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Status	Advanced success
Started	...
Astrometry.net job	4194330
PixInsight job	YKUTGQHD3ELQRNMNOG3146U1NEVVVL4K
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	06h19m21s.346
RA (top/left)	06h16m38s.158
RA (top/right)	06h25m25s.648
RA (bottom/right)	06h22m07s.703
RA (bottom/left)	06h13m16s.430

Dec (center)	+22°42′22″.20
Dec (top/left)	+21°26′54″.31
Dec (top/right)	+22°35′30″.81
Dec (bottom/right)	+23°57′49″.20
Dec (bottom/left)	+22°48′13″.10

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