G100.4+04.6 (Gary Imm)

G100.4+04.6

This object is a planetary nebula, located in the constellation of Cepheus at a declination of +59 degrees. Also known as PM 1-333, it is located about 1.5 degrees north of IC 1396 (the Elephant’s Trunk), and about 0.5 degree northwest of the red supergiant star Mu Cephei (Herschel’s Garnet Star).

In SIMBAD, this object is known as PN G100.4+04.6 (a “possible planetary nebula”), while in NED it is surprisingly known slightly differently as PN G100.5+04.7.

The only published information that I have found of this object is in the excellent 2009 paper, “Spectroscopic confirmation of the planetary nebula nature of PM 1-242, PM 1-318 and PM 1-333 and morphological analysis of the nebulae”. This paper confirms that this object is indeed a planetary nebula. The lack of a sharply defined outer shell is attributed to the idea that the fast outer winds from the central star have ceased and that the nebular material is backfilling the central cavity.

There appears to be a very faint white star at the center of the nebula, likely the source star, but it is too faint to be sure.

The 3 pointed red “cones” are the most interesting aspect of this nebula to me. I assume that there is a 4th on the backside of the nebula, pointing away from us. The cones look like the remnants of multi-polar jet outflows from the central star. HII dominates these outflows, while OIII dominates the central nebula region.

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Status	Advanced success
Started	...
Astrometry.net job	5032309
PixInsight job	ETI1I2TX0I17LUSORSWEPDKP0KFLUJND
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	21h40m58s.959
RA (top/left)	21h41m30s.403
RA (top/right)	21h40m27s.463
RA (bottom/right)	21h40m27s.601
RA (bottom/left)	21h41m30s.379

Dec (center)	+58°58′42″.87
Dec (top/left)	+59°01′27″.53
Dec (top/right)	+59°01′26″.88
Dec (bottom/right)	+58°55′58″.15
Dec (bottom/left)	+58°55′58″.74

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G100.4+04.6

G100.4+04.6

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G100.4+04.6

G100.4+04.6

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