Abell 39 (OIII-RGB) #1 (Molly Wakeling)

Celestial hemisphere: Northern · Constellation: Hercules (Her) · Contains: PGC 1817715 · PGC 1821082 · PGC 1821778 · PGC 1824738 · PGC 2817010 · PGC 3089352 · PGC 58246 · PK047+42.1

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Abell 39 (OIII-RGB) #1

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Abell 39 (OIII-RGB) #1

First completed image from the dark site weekend -- Abell 39! This is a dim planetary nebula up in the constellation Hercules, about 6,800 lightyears from Earth. Unlike many of our favorite planetary nebulae (Ring Nebula, Dumbbell Nebula, etc), this one is nearly perfectly spherical, and is rather large at 2.5 lightyears across. The bright ring around the edges is itself thicker than our solar system is wide! It does have some mottled structure that I couldn't quite capture with my short overall exposure time, but you can kind of see hints of it.

The blue-green color is glowing oxygen gas ejected by this subdwarf O-type star. The nebula is magnitude 12.9, while the central star is mag 15.5. To create this image, I took red, green, and blue color filter data, as well as oxygen-III filter data, which I made the luminance channel. There is very little red present in the nebula.

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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	4490632
PixInsight job	VKYI8NTZG4Q4A1OJI7X6XOGI8B8FCGML
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	16h27m33s.679
RA (top/left)	16h29m25s.163
RA (top/right)	16h25m32s.112
RA (bottom/right)	16h25m42s.938
RA (bottom/left)	16h29m34s.693

Dec (center)	+27°54′32″.74
Dec (top/left)	+28°15′31″.15
Dec (top/right)	+28°12′31″.61
Dec (bottom/right)	+27°33′29″.10
Dec (bottom/left)	+27°36′25″.20

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Abell 39 (OIII-RGB) #1

Abell 39 (OIII-RGB) #1

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Abell 39 (OIII-RGB) #1

Abell 39 (OIII-RGB) #1

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