SH2-200 and LBN 674 - The Bear Claw Nebula (Bob Stevenson)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: LBN 674 · PK138+04.1 · Sh2-200

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SH2-200 and LBN 674 - The Bear Claw Nebula

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SH2-200 and LBN 674 - The Bear Claw Nebula

This is the Bear Claw Nebula in Cassiopeia. It has very low surface brightness and was a challenge to expose as well as process. I actually gave up once along the path to the finished image, but picked it up again and finished it off as well as I could.

The details in this nebula are very interesting. It looks like a little blue meat pie. The centre has ridges of OIII detail, with some Ha on the outer edges. There is a dark circle around the circumference. Outside of this circle there is more OIII followed by a large area of Ha.

I had just given the ring and worm gears in my CEM60 a good cleaning to get rid of a summer's worth of spiders and earwigs, and it was tracking pretty well so I tried 15 minute subs for the first time. The best stretched and calibrated OIII sub exposure is presented as the other version of this image. You can see why I initially gave up - there is not much detail even after 15 minutes!

Original
I

I

Description: The best 15 minute OIII subexposure ! (6.5nm filter, f7, Bortle 8)

Uploaded: ...

ZWO ASI2600MM Pro
IOptron CEM
Schmidt-Cassegrain Telescope (SCT) Imagers
Imaged with N.I.N.A.

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Status	Advanced success
Started	...
Astrometry.net job	5209219
PixInsight job	R8NLN5Q2W5XR4WXPWO0VAF6JL3ACQBJC
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	03h11m09s.971
RA (top/left)	03h09m18s.625
RA (top/right)	03h09m23s.875
RA (bottom/right)	03h12m59s.135
RA (bottom/left)	03h12m58s.573

Dec (center)	+62°49′07″.54
Dec (top/left)	+63°07′44″.98
Dec (top/right)	+62°30′11″.18
Dec (bottom/right)	+62°30′24″.30
Dec (bottom/left)	+63°07′58″.54

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SH2-200 and LBN 674 - The Bear Claw Nebula

SH2-200 and LBN 674 - The Bear Claw Nebula

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SH2-200 and LBN 674 - The Bear Claw Nebula

SH2-200 and LBN 674 - The Bear Claw Nebula

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