Planetary NGC 6894 with Ha Area (Bill McLaughlin)

Planetary NGC 6894 with Ha Area

NGC 6894 is a planetary nebula located in Cygnus. Although mostly ordinary in shape, deep Ha images such as seen here reveal a distinct set of Ha "Stripes" to the NNW of the nebula. A 1996 study of the nebula seems to indicate that the material of the stripes originated from stripping of the gas halo of the nebula by the interstellar medium and that this gas has been ionized by the central star of NGC 6894. It also appears that the shape of the stripes is determined by the magnetic field of the Milky Way. This is a phenomenon that appears to be not uncommon in planetary nebulae although was not recognized until well after their discovery. The paper can be found here: NGC 6894 Paper on Ha Stripes

Taken over 14 nights between August 28th and October 4th, 2023 from SkiesAway observatory in California.

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Title: Planetary NGC 6894 with Ha Area

Description: NGC 6894 is a planetary nebula located in Cygnus. Although mostly ordinary in shape, deep Ha images such as seen here reveal a distinct set of Ha "Stripes" to the NNW of the nebula. A 1996 study of the nebula seems to indicate that the material of the stripes originated from stripping of the gas halo of the nebula by the interstellar medium and that this gas has been ionized by the central star of NGC 6894. It also appears that the shape of the stripes is determined by the magnetic field of the Milky Way. This is a phenomenon that appears to be not uncommon in planetary nebulae although was not recognized until well after their discovery.

Taken over 14 nights between August 28th and October 4th, 2023 from SkiesAway observatory in California

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Status	Advanced success
Started	...
Astrometry.net job	8980348
PixInsight job	DVXJZGER6XBMHMR8YA3DMUOZ819O7XNE
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	20h16m22s.493
RA (top/left)	20h17m01s.813
RA (top/right)	20h15m41s.996
RA (bottom/right)	20h15m43s.284
RA (bottom/left)	20h17m02s.910

Dec (center)	+30°34′49″.72
Dec (top/left)	+30°42′27″.81
Dec (top/right)	+30°42′10″.12
Dec (bottom/right)	+30°27′10″.85
Dec (bottom/left)	+30°27′28″.16

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