SH2-184 (NGC 281 or IC11) - gotcha (Tom Gray)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: HD4647 · HD5005 · HD5032 · IC 1590 · LBN 611 · LBN 615 · LBN 616 · LBN 621 · NGC 281 · Sh2-184

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SH2-184 (NGC 281 or IC11) - gotcha

Revision title: Processed with Siril

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SH2-184 (NGC 281 or IC11) - gotcha

Revision title: Processed with Siril

Now that I've got this setup dialed in with my Meade f6.3 reducer, and worked out how to use a GEM, I'm on a roll. This emission nebula in Cassiopeia, is one of the Queen's crown jewels. SH2-184, colloquially known as the 'pacman', it lies ~9500 LY away in the Perseus arm of the MW.

Not a particularly long integration as I was messing around trying my old Meade off-axis guider (designed for manually guiding SCTs... never again!). Unfortunately, I needed to add a 50mm T adapter between the guider and my CMOS camera, to achieve focus along with my Orion starshoot autoguide camera, resulting in excessive backspace; I need to look out for one of these thin OAGs. Anyway long story short a significant amount of 'dark' sky time was lost, and I didn't start imaging until the moon was well up.

There is a little bit of trailing with 5 minute guided exposures, which has smeared some of the detail, and it really needs longer integration. I think my PA was a little off. I might try adding some Ha data with my mono camera to try and pull back some of the finer detail. The mouseover comparison is default DDP in Nebulosity - this lacks the depth, but does appear to show off the HII and OIII regions more clearly.

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B

Title: Processed in Nebulosity v4

Uploaded: ...

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Title: Processed using APP

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D

Title: Processed with Siril

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Altair Astro 183 M/C Hypercams
UK Astro-Imaging
Optolong L-eNhance filter
The OSC Club (One Shot Camera)

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Status	Advanced success
Started	...
Astrometry.net job	7321058
PixInsight job	5Y37HI6T6K2JI36K7KYNRRKO2G1KL6GJ
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	00h53m18s.33
RA (top/left)	01h00m20s.91
RA (top/right)	00h46m38s.73
RA (bottom/right)	00h46m27s.22
RA (bottom/left)	00h59m44s.70

Dec (center)	+56°38′59″.9
Dec (top/left)	+57°12′17″.5
Dec (top/right)	+57°17′25″.8
Dec (bottom/right)	+56°04′12″.9
Dec (bottom/left)	+55°59′15″.8

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SH2-184 (NGC 281 or IC11) - gotcha

Revision title: Processed with Siril

SH2-184 (NGC 281 or IC11) - gotcha

Revision title: Processed with Siril

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SH2-184 (NGC 281 or IC11) - gotcha

Revision title: Processed with Siril

SH2-184 (NGC 281 or IC11) - gotcha

Revision title: Processed with Siril

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