Abell 79 • Rare Planetary Nebula in HOO (Douglas J Struble)

Celestial hemisphere: Northern · Constellation: Lacerta (Lac)

Abell 79 • Rare Planetary Nebula in HOO, Douglas J Struble

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Abell 79 • Rare Planetary Nebula in HOO

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Abell 79 • Rare Planetary Nebula in HOO

This is the first time using my ZWO ASI183MM Pro with my ES 165mm refractor. I was concerned about imaging at 0.43" per pixel; especially drizzling the data, which brought it down to 0.215" per pixel. I was very happy with the results, though. I also went pretty deep on it too with the integration time, as I wanted to not only pull more detail out but pick up some of the background Ha as well. I am pretty happy with my results given I am just shooting this in my backyard bortle sky scale of 8 near Detroit, Michigan.

Abell 79 is an enigmatic planetary nebula in Lacerta comprising an irregular and broadened oval-shaped ring from which faint oppositely-directed lobes emerge that have nearly vanished into the interstellar medium. A pronounced asymmetry is evident in the surface brightness of the northern lobe; its northeast side is much brighter than the other.

The ring, assumed to be circular, is inclined 49 degrees to the line-of-sight with its northern side approaching us relative to its center, and it is expanding at about 13 km/sec. Oddly, the faint central source (with a visual magnitude of about 17) is a relatively cool dwarf star that is incapable of producing the ionized species seen in its spectrum, suggesting that it has an unseen and hot companion.

Abell Planetary Nebula
Planetary Nebulae

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Abell 79 • Rare Planetary Nebula in HOO

Abell 79 • Rare Planetary Nebula in HOO

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Abell 79 • Rare Planetary Nebula in HOO

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