Sh2-`188 in SHO (Alex Woronow)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: PK128-04.1 · Sh2-188

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Sh2-`188 in SHO

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Sh2-`188 in SHO

Sh2-188 in SHO

OTA: Star-Fire 175 (f/8)

Camera: FLI - PL16070AE

Observatory: Deep Sky West

EXPOSURES:

Hydrogen: 20 x 1800 sec

Sulfur: 24 x 1800

Oxygen: 9 x 1800

Total exposure 26.5 hours

Image Width: ~1 deg

Processed by Alex Woronow (2020) using PixInsight, Topaz, Skylum, Starnet, SWT

The planetary nebula, Sh2-188, is somewhat unusual in that it is moving rapidly though space. That motion, plus the usual fast and slow wind components of the interstellar media have affected the geometry of this nebula (Wareing, C., et al., 2004). The leading edge (at 4:00) suffers a bow-shock as from the nebula’s interaction with the winds. Presumably, the faint “tail” of the nebula consists of gases left behind or blown of the trailing edge as the bulk of the nebula moves rapidly onward.

The fast-moving central star (now a white dwarf) is marginally visible in this narrowband image (with a great deal of zoom); it lies close to the small blue star just inside the lower-right part of the bubble. It is this central star, with the assistance of the shock wave, that ionizes the gases of its planetary nebula.

Fine Art Astrophotography

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Status	Advanced success
Started	...
Astrometry.net job	3608256
PixInsight job	7ACCDEJE95IU3ND5AI1SFRB09GLGPBSD
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	01h30m22s.20
RA (top/left)	01h27m20s.67
RA (top/right)	01h27m33s.42
RA (bottom/right)	01h33m18s.98
RA (bottom/left)	01h33m15s.47

Dec (center)	+58°24′12″.6
Dec (top/left)	+58°52′17″.4
Dec (top/right)	+57°55′00″.3
Dec (bottom/right)	+57°55′51″.2
Dec (bottom/left)	+58°53′09″.7

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Sh2-`188 in SHO

Sh2-`188 in SHO

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Sh2-`188 in SHO

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