Sh2-200 The Bearclaw Planetary Nebula (Göran Nilsson)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: HD18736 · HD18757 · HD18876 · HD18990 · HD19243 · HD19440 · HD19844 · LBN 674 · PGC 138608 · PGC 166461 · PGC 168324 · PGC 168326 · PGC 168330 · PGC 2797203 · PGC 2797218 · PGC 2797246 · PGC 2797257 · PGC 2797265 · PGC 2797266 · PGC 2797337 · PGC 2797345 · PGC 2797346 · PGC 2797350 · PGC 2797357 · PGC 2797361 · PGC 2797371 · PGC 2797375 · PGC 2797376 · PGC 2797392 · PGC 2797429 · And 4 more.

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Sh2-200 The Bearclaw Planetary Nebula

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Sh2-200 The Bearclaw Planetary Nebula

Stewart Sharpless discovered this nebula in 1959 and included it in his catalogue of HII regions found in photographic plates taken at the Palomar Observatory. This is a bit odd as the brightest part is primarily emitting blue Oiii. However, this image shows that there is quite a lot of Ha emission surrounding it. Beverly Lynds subsequently included it in her catalogue of bright nebulae as LBN 674. In 1983 astronomers Herbert Hartl, Johann Dengel and Ronald Weinberger included Sh2-200 as HDW2 in their catalogue of possible planetary nebulae. Finally in 2017 it was confirmed to be a true planetary nebula (PNG 138.1+04.1).

To the right of the PN we can see Trumpler 3, an open star cluster, and up in the top left corner there is a bluish smudge that I found in the HASH database to be a true PN named PNG 139.0+03.2 (possibly a first on Astrobin)

This is a HOO image (so Ha to the red channel and Oiii to the blue and green channels), and it is the first proper image taken with my Edge HD11 with Hyperstar v4.

"Nordish by nature"
Hydrogen and Oxygen Narrowband Only!
Sharpless2 Objects
CMOS Imagers

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Status	Advanced success
Started	...
Astrometry.net job	9683818
PixInsight job	1IK4J0R3SZWXGYQN74G9DDYJAWYRSCI8
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	03h09m04s.41
RA (top/left)	03h16m02s.26
RA (top/right)	03h16m37s.70
RA (bottom/right)	03h01m31s.46
RA (bottom/left)	03h02m05s.33

Dec (center)	+62°40′48″.4
Dec (top/left)	+61°28′17″.5
Dec (top/right)	+63°52′11″.6
Dec (bottom/right)	+63°52′06″.1
Dec (bottom/left)	+61°28′09″.3

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Sh2-200 The Bearclaw Planetary Nebula

Sh2-200 The Bearclaw Planetary Nebula

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Sh2-200 The Bearclaw Planetary Nebula

Sh2-200 The Bearclaw Planetary Nebula

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