HFG-1 and Abell 6 - Planetary Nebulae in Cassiopeia (Fran D.)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: HD17631 · HD17706 · HD17857 · HD17958 · HD18137 · HD18565 · HD18892 · PK136+04.1 · PK136+05.1

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HFG-1 and Abell 6 - Planetary Nebulae in Cassiopeia

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HFG-1 and Abell 6 - Planetary Nebulae in Cassiopeia

My image contains two planetary nebulae; the larger HFG-1 on the left side and the smaller, more traditional looking planetary nebula, Abell 6 (PK 136+0.41) in the center.

HFG-1 (also known as PK 136+051) was discovered in 1982 by Heckathorn, Fasen, and Gull. The dying central star (V664 Cas) is/was a large red giant that is part of a binary star system moving through our galaxy. The blue ring around the HFG-1 is the leading bow shock produced as it travels through space, interacting with the interstellar medium. HFG-1 also leaves a long red gaseous trail in its wake.

HFG-1 is an old planetary nebula. Planetary nebula are a short lived phase in the death of some stars, most having on the order of a10,000 year lifespan. HFG-1 will soon disperse its gases and disappear.

The signal from these nebula as well as the Ha gas clouds are very weak. Oiii is actually the more dominant signal, occurring only within the planetary nebula themselves; there is not a wisp of Oiii anywhere else. The Ha emission is an uncharacteristically weak signal. Outside of the planetary nebulae and the large cloud on the right side of the image, the rest of the Ha is barely above the noise floor. All in all, not the easiest image I've processed.

Narrowband imaging
Central USA
ZWO ASI294MM Pro Images
The refractors!
Cloudy Nights

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Status	Advanced success
Started	...
Astrometry.net job	8813467
PixInsight job	YRJM7Y5X6K322XJNRLT6VWHDBVKRPOEU
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	02h59m08s.552
RA (top/left)	03h09m19s.791
RA (top/right)	03h00m51s.519
RA (bottom/right)	02h49m24s.535
RA (bottom/left)	02h57m15s.568

Dec (center)	+64°26′42″.10
Dec (top/left)	+65°03′06″.84
Dec (top/right)	+63°12′59″.99
Dec (bottom/right)	+63°47′44″.49
Dec (bottom/left)	+65°40′22″.97

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HFG-1 and Abell 6 - Planetary Nebulae in Cassiopeia

HFG-1 and Abell 6 - Planetary Nebulae in Cassiopeia

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HFG-1 and Abell 6 - Planetary Nebulae in Cassiopeia

HFG-1 and Abell 6 - Planetary Nebulae in Cassiopeia

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