The Jellyfish Nebula, IC 443 (astropical)

Celestial hemisphere: Northern · Constellation: Gemini (Gem) · Contains: 10 Gem · 11 Gem · 12 Gem · 4 Gem · 5 Gem · 6 BU Gem · 7 Gem) · 7 eta Gem · 8 Gem · 9 Gem · Gem A · IC 443 · IC 444 · Praepes (η Gem · Tejat Prior · The star 12 Gem · The star 5 Gem · The star 6 Gem · The star 8 Gem · The star 9 Gem · The star Propus

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The Jellyfish Nebula, IC 443

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The Jellyfish Nebula, IC 443

This time it weren't the clouds ending my session, I had to get up early for a pre-surgery check in a hospital where a doctor asked me: "Oh, where are you from?" "Well, I'm from outer space, the fourth planet around Eta Geminorum" (as i imaged the Jellyfish in Gemini). Then the doc went, "Oh, what a coincidence, that's where I met my wife". Now I know why Mr Spock raises his eyebrow. Anyways, back to astronomy.

This time I aimed at IC 443, the Jellyfish, simultaneously with a Samyang 135mm + LPR + IR-Cut + Uranus-C(IMX585) and a Ø71mm/450mm APO + LPRII + Nikon D5300 (modified) saddled on the same mount. After throwing off bad frames, there were 120 x 120 seconds left from the IMX585 and 62 x 180 seconds left from the DSLR. The DSLR image is more detailed and sharper because of the finer image scale of 1.8"/px versus 4.64"/px. The star sizes of both images have been reduced for looking less messy. Next time I will swap cameras.

In spite of three and four hours integration the images (more likely the imager) disappoint a little. The Jellyfish has a low surface brightness, alright, and there were thin veils of whatsoever in the sky. Guess my location recently changed from Bortle 4 to 6. On the other hand, the Samyang at f/2 loves to generate vignetting as the center of the image is outshined whatever exposure time I choose, even at f/4. Not so the 450mm f/6.3 APO. Fortunately, background extraction in Siril does a fine job.

BTW, do you know what a poorly collimated Apochromat with wrong back focus is called? Right, an Apocalypse.

Final
Original
B
C

B

Title: DSLR Version

Description: Nikon D5300 (modified), LPR II filter, 62 x 180 seconds at ISO1600.

Uploaded: ...

C

Title: Annotated Version

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	9005620
PixInsight job	APLUAB72PZU1GQ8FU4BN8J7K3IWBNS2K
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	06h16m13s.13
RA (top/left)	06h10m07s.92
RA (top/right)	06h10m25s.46
RA (bottom/right)	06h22m05s.20
RA (bottom/left)	06h22m13s.64

Dec (center)	+22°47′53″.8
Dec (top/left)	+25°13′02″.7
Dec (top/right)	+20°21′34″.9
Dec (bottom/right)	+20°21′57″.1
Dec (bottom/left)	+25°13′35″.8

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The Jellyfish Nebula, IC 443

The Jellyfish Nebula, IC 443

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The Jellyfish Nebula, IC 443

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