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Sh2-216 • Biggest Planetary Nebula in HOO, 


            Douglas J Struble
Sh2-216 • Biggest Planetary Nebula in HOO
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Sh2-216 • Biggest Planetary Nebula in HOO

Technical card

Imaging telescopes or lenses: Stellarvue SV70T

Imaging cameras: ZWO ASI1600MM-Cool

Mounts: Orion Atlas Pro AZ/EQ-G

Guiding telescopes or lenses: Stellarvue 50mm Guidescope

Guiding cameras: ASI224MC

Focal reducers: Stellarvue SV70T Focal Reducer

Software: PHD2  ·  Sequence Generator Pro  ·  PixInsight  ·  Photoshop CS5  ·  SkySafari Pro

Filters: Astronomik Ha 6nm 1.25''  ·  Astrodon OIII 3nm

Accessory: QHYCCD PoleMaster  ·  ZWO 8x 1.25" Filter Wheel (EFW)  ·  MoonLite CFL 2.5" Large Format Focuser

Dates:Dec. 23, 2019Feb. 14, 2020

Astrodon OIII 3nm: 220x120" (gain: 200.00) -20C bin 1x1
Astronomik Ha 6nm 1.25'': 418x120" (gain: 200.00) -20C bin 1x1

Integration: 21.3 hours

Darks: ~50

Flats: ~50

Bias: ~250

Avg. Moon age: 23.67 days

Avg. Moon phase: 37.33%

Bortle Dark-Sky Scale: 8.00

Basic astrometry details job: 3943961

RA center: 4h 41' 29"

DEC center: +46° 33' 10"

Pixel scale: 2.316 arcsec/pixel

Orientation: 13.846 degrees

Field radius: 1.644 degrees

Resolution: 4008x3172

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

Data source: Backyard


This is one of the hardest deep space objects I have ever had to process not only due to how faint it is, but also given the limited clear nights we get here in Michigan during the winter months. I was hoping to get more integration time on this, but as the milky way moves beyond the night's sky, I need to switch telescopes on my second rig for galaxy season.

This very large planetary nebula is the second closest to earth and is very faint. SH2-216 (aka GN 04.41.3, Simeis 288, Marsalkova 44, LBN 742, YM 22, GN 04.41.3), in Perseus, is the largest known PN; one of the closest (425 light years) and one of the oldest. Its apparent diameter is reported to be 1.6° (for comparison, the Moon diameter is 0.5°).

This PN is very diffuse with a brighter east border, probably due to the interaction with the interstellar medium.



Douglas J Struble
License: None (All rights reserved)

Sky plot

Sky plot


Sh2-216 • Biggest Planetary Nebula in HOO, 


            Douglas J Struble

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Sharpless2 Objects