Hemisphere:  Northern
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KjPn8 Bipolar Planetary Nebula (PN G112.5-00.1), 


            Douglas J Struble
KjPn8 Bipolar Planetary Nebula (PN G112.5-00.1)
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KjPn8 Bipolar Planetary Nebula (PN G112.5-00.1)

Technical card

Imaging telescopes or lenses: Explore Scientific ED165CF FPL-53

Imaging cameras: ZWO ASI1600MM-PRO

Mounts: Astro-Physics Mach 1 GTO

Guiding telescopes or lenses: Orion 80mm Short Tube

Guiding cameras: Starlight Xpress Lodestar x2

Software: Photoshop CC  ·  PHD2  ·  Sequence Generator Pro  ·  PixInsight

Filters: Astronomik Deep-Sky G  ·  Astronomik Deep-Sky R  ·  Astronomik Deep-Sky B  ·  Astronomik Ha 6nm 1.25''  ·  Astrodon OIII 3nm

Accessory: QHYCCD PoleMaster  ·  ZWO 8x 1.25" Filter Wheel (EFW)  ·  Hotech 2" SCA Self-Centering Field Flattener  ·  MoonLite CFL 2.5" Large Format Focuser

Dates:Sept. 13, 2020Sept. 21, 2020Oct. 4, 2020

Astrodon OIII 3nm: 444x120" (gain: 200.00) -20C bin 1x1
Astronomik Deep-Sky B: 60x60" (gain: 0.00) -20C bin 1x1
Astronomik Deep-Sky G: 60x60" (gain: 0.00) -20C
Astronomik Deep-Sky R: 60x60" (gain: 0.00) -20C
Astronomik Ha 6nm 1.25'': 1628x120" (gain: 200.00) -20C bin 1x1

Integration: 72.1 hours

Darks: ~50

Flats: ~50

Bias: ~250

Avg. Moon age: 15.64 days

Avg. Moon phase: 45.43%

Bortle Dark-Sky Scale: 8.00

Basic astrometry details

Astrometry.net job: 3921005

RA center: 23h 24' 7"

DEC center: +60° 56' 31"

Pixel scale: 0.679 arcsec/pixel

Orientation: 47.825 degrees

Field radius: 0.296 degrees

Resolution: 2436x1973

Locations: Backyard White Zone Observatory, Taylor, MI, Michigan, United States

Data source: Backyard


This one was pretty difficult to capture and process. For a Planetary Nebula, there is very little OIII, so I concentrated mostly on the Ha structure. I tried to do it justice by really piling on the integration time. It reminds me a lot of the Squid Nebula (Ou4), but mostly in Ha instead of OIII. Ou4 is bipolar as well.

Located in the constellation of Cassiopeia just off the famous Bubble Nebula, KjPn8 (also known as PN G112.5-00.1) is a very unusual bipolar planetary nebula. Its complex structure is the result of irregular ejections of gas in different directions. It is about 14′ x 4′ in size, so given my focal length and image scale I cropped the image a lot. The edge of the Bubble Nebula was actually in the corner of the image before cropping. The radial velocity measurements suggest a distance of ~5,200 light years.



Douglas J Struble

Sky plot

Sky plot


KjPn8 Bipolar Planetary Nebula (PN G112.5-00.1), 


            Douglas J Struble