SH2-216 - A Massive PN in Perseus (Fran D.)

Celestial hemisphere: Northern · Constellation: Perseus (Per) · Contains: HD29818 · HD29900 · HD29997 · LBN 742 · LBN 744 · PK158+00.1 · Sh2-216

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SH2-216 - A Massive PN in Perseus

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SH2-216 - A Massive PN in Perseus

The constellation Perseus is home to SH2-216, possibly the largest Planetary Nebula (PN) in our sky. SH2-216 is also cataloged as PK 158 +00.1 and LBN 744/722. It is one of the closest PN to us, estimated to be somewhere between 370-420 light years away. Its actual size is thought to be within the 9-30 light year range, but because of its close proximity to us it has an apparent size of 1.6 degrees, greater than 3X the diameter of the full moon.

SH2-216 was formed by an intermediate sized dying red giant star, eventually becoming a white dwarf. The stars outer layers were cast off while the remaining core contracted. The core temporarily continued to radiate energy, ionizing the expelled gas, interacting with dust, and eventually forming the PN we see today.

This is another structure that is apparently not widely imaged on Astrobin. SH2-216 has a very low surface brightness, and other than the eastern rim of the nebula (top left on my image), is a very dim target. The Ha signal is strongest, encompassing most of the nebula extent. The Sii is weaker, covering most of the aerial extent of the nebula, but in thin wispy clouds. The Oiii signal is by far the weakest, forming a relatively small amorphous cloud below the east rim. My image is an SHO image with the strong Ha green color knocked down in order to better see the interesting Sii signal in the middle of the nebula.

Narrowband imaging
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Status	Advanced success
Started	...
Astrometry.net job	8939455
PixInsight job	963JAHL6K6MNPE496YVFM6OCDEG6MSJ6
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	04h42m15s.607
RA (top/left)	04h48m58s.318
RA (top/right)	04h42m56s.549
RA (bottom/right)	04h35m24s.906
RA (bottom/left)	04h41m36s.737

Dec (center)	+46°42′56″.89
Dec (top/left)	+46°10′22″.61
Dec (top/right)	+47°59′18″.70
Dec (bottom/right)	+47°14′08″.26
Dec (bottom/left)	+45°26′41″.63

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SH2-216 - A Massive PN in Perseus

SH2-216 - A Massive PN in Perseus

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SH2-216 - A Massive PN in Perseus

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