Abell 18 (Gary Imm)

Celestial hemisphere: Southern · Constellation: Monoceros (Mon) · Contains: PK216-00.1

Abell 18

This planetary nebula is located 5000 light years away in the constellation of Monoceros at a declination of -3 degrees. It is a magnitude 17 PN which spans 1.4 arc-minutes in our apparent view, corresponding to a diameter of 2 light years. It is amazing to me how many PN are consistently around this 2 light year size.

Like many PN, the outer rim is stronger in HII while the inner section is stronger in OIII. The elliptical PN is a bit distorted, as if it was being pinched a bit at the 5 and 11 o’clock positions. The rim is slightly brighter and thinner at these spots. We could be looking at a slightly bipolar PN extending from lower left to upper right, with the bright rim areas being the side-on view of the constraining torus area.

There are several faint stars in the central region but none are obviously the progenitor star.

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Status	Advanced success
Started	...
Astrometry.net job	5411215
PixInsight job	O3E3XFKW30O2CC0DZF0KR4J7NLTTSFNS
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	06h56m14s.683
RA (top/left)	06h56m55s.371
RA (top/right)	06h55m33s.973
RA (bottom/right)	06h55m33s.995
RA (bottom/left)	06h56m55s.413

Dec (center)	-02°53′04″.31
Dec (top/left)	-02°46′14″.47
Dec (top/right)	-02°46′15″.16
Dec (bottom/right)	-02°59′54″.11
Dec (bottom/left)	-02°59′53″.50

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Abell 18

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