NGC 6894 Planetary Nebula (Douglas J Struble)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: NGC 6894

NGC 6894 Planetary Nebula, Douglas J Struble

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NGC 6894 Planetary Nebula

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NGC 6894 Planetary Nebula

I am finally finishing off a new DSO. It has been tough getting clear nights this autumn her in Michigan. Out of all the images I have seen of this planetary nebula, I have only seen one image that had surrounding Ha. I decided to go deep with integration time and processing to see if I could pull that out. I am rather happy with my results.

The planetary nebula NGC 6894 was discovered by William Herschel on 17th July 1784. With an angular diameter of around 40 arc minutes, it appears about as large as Jupiter, but is much fainter: around 14 magnitudes. The distance is about 1669 pc (about 5400 light years).

At first glance, NGC 6894 looks like what appears to be a typical planetary nebula, with a diffuse, spherical outer shell and a tortuous inner structure. The pink color of this nebula could be due to the reddening of the light by intervening clouds of gas and dust in our line of sight. However, this planetary nebula holds a unique surprise, which only becomes apparent on images taken with a particularly long exposure time (deep field): Northwest of the nebula there are faint gas stripes, which are ionized by the central star of NGC 6894 and shine in Hα light. Presumably this gas comes from the halo of the planetary nebula, which hit the interstellar medium. Notably, these streaks of glowing gas are parallel to the galactic plane. It is believed that they aligned along the galactic magnetic field.

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Title: Apod GrAG 1-1-24

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Description: Sky's Up Magazine January 2024

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Planetary Nebulae

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Status	Basic success
Started	...
Astrometry.net job	8668775
PixInsight job	n/a
PixInsight queue size	n/a
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