Sh2-174 (Jan Beránek)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: LBN 598 · PK120+18.1 · Sh2-174

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Sh2-174

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Sh2-174

Challenging myself with something more difficult to capture, i picked up this very faint planetary (?) nebula - catalogued as Sh2-174 - as my next astrophotography object last week.
In order to capture it, i had to collect 21 hours of exposures, using special filters that only select the light emitted by hydrogen (red) and oxygen (turquoise).
I am sure that as i master more processing skills in the future, i should be able to turn the data into a nicer, better photograph.

Not only is this nebula faint, but also very asymmetrical. One explanation is that the central star that created this nebula is moving very fast through the space, "dragging" the clouds of gas behind it, with hydrogen (red) lagging behind - probably due to its interaction with surrounding matter - more than oxygen (greenish-blue).
A candidate of this star, currently a white dwarf, is one of dots in the very center of the oxygen (greenish-blue) part of the nebula.
However, recent analysis question the assumption that this might be a planetary nebula. It appears that the white dwarf is much older than the nebula, and might be just coincidentally passing through this interstellar cloud.

Planetary Nebulae

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Status	Advanced success
Started	...
Astrometry.net job	9091776
PixInsight job	O6ZEV9BTZNGZMCSJTTXPTS9DNJ2BKW1S
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	23h46m29s.47
RA (top/left)	00h08m11s.71
RA (top/right)	23h40m32s.48
RA (bottom/right)	23h24m44s.34
RA (bottom/left)	23h51m27s.20

Dec (center)	+80°56′25″.4
Dec (top/left)	+80°53′31″.3
Dec (top/right)	+81°46′11″.8
Dec (bottom/right)	+80°54′34″.7
Dec (bottom/left)	+80°06′27″.4

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