Abell 43 Planetary Nebula (Jerry Macon)

Celestial hemisphere: Northern · Constellation: Ophiuchus (Oph) · Contains: PK036+17.1

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Abell 43 Planetary Nebula

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Abell 43 Planetary Nebula

Abell 43 is an extremely faint planetary nebula, which is very rarely imaged. The nebula is a sphere of gas with an intricate lace-like network of tendrils. It is difficult to detect at all, and a challenge to image, even under dark skies. It is listed as having a magnitude of 14.7, but the light is spread out into ghostly wisps.

Other designations include: PK 036+17.1,PN G036.0+17.6,IRAS 17511+1037

Abell 43 is one of two pulsating ``hybrid-PG 1159'' stars. The other is HS 2324+3944.

It exhibits at least two periods of 2600 s and 3035 s, the longest ones observed up to now in PG 1159 and “hybrid-PG 1159” pulsators. This strongly suggests that the variations are due to non-radial g-mode pulsations and cannot be a consequence of binarity. This discovery raises puzzling questions regarding the excitation mechanism in this H rich, C and O poor “hybrid-PG 1159” since the C and O abundances are too low to trigger the instability through the κ-mechanism induced by the partial ionization of C and O, a mechanism invoked to explain the instability in the PG 1159 stars and in the previously known “hybrid-PG 1159” pulsator HS 2324+3944.

Abell Planetary Nebula

ABELL Planetary Nebulae

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Status	Advanced success
Started	...
Astrometry.net job	3792300
PixInsight job	T1VE402ETSOODNGVUOXGHYSPJ5VIIXCW
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	17h53m31s.739
RA (top/left)	17h53m02s.481
RA (top/right)	17h52m58s.669
RA (bottom/right)	17h54m00s.960
RA (bottom/left)	17h54m04s.847

Dec (center)	+10°37′09″.80
Dec (top/left)	+10°48′52″.70
Dec (top/right)	+10°26′04″.23
Dec (bottom/right)	+10°25′27″.26
Dec (bottom/left)	+10°48′14″.93

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Abell 43 Planetary Nebula

Abell 43 Planetary Nebula

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Abell 43 Planetary Nebula

Abell 43 Planetary Nebula

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