Hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  IC 289
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IC 289 • Planetary Nebula (My Smallest DSO), 


            Douglas J Struble
IC 289 • Planetary Nebula (My Smallest DSO)
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IC 289 • Planetary Nebula (My Smallest DSO)

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: Adobe Photoshop CS5.5  ·  PHD2  ·  Sequence Generator Pro  ·  PixInsight  ·  SkySafari Pro

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

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

Dates:Aug. 27, 2020Sept. 4, 2020Sept. 5, 2020

Astrodon OIII 3nm: 425x120" (gain: 200.00) -20C bin 1x1
Astronomik Deep-Sky B: 30x60" (gain: 0.00) -20C bin 1x1
Astronomik Deep-Sky G: 30x60" (gain: 0.00) -20C bin 1x1
Astronomik Deep-Sky R: 33x60" (gain: 0.00) -20C bin 1x1
Astronomik Ha 6nm 1.25'': 370x120" (gain: 200.00) -20C bin 1x1

Integration: 28.1 hours

Darks: ~50

Flats: ~50

Bias: ~250

Avg. Moon age: 14.60 days

Avg. Moon phase: 84.74%

Bortle Dark-Sky Scale: 8.00

Basic astrometry details

Astrometry.net job: 3834570

RA center: 3h 10' 18"

DEC center: +61° 19' 1"

Pixel scale: 0.340 arcsec/pixel

Orientation: 102.262 degrees

Field radius: 0.091 degrees

Resolution: 1498x1196

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

Data source: Backyard


Setting out to capture IC 289 was my biggest challenge ever at only 0.50 arc minutes. I wanted to see how much detail I could resolve through integration time and processing compared to what was done from the Mount Lemmon SkyCenter Schulman Telescope that is 32" in size:


I was pretty happy with my results. My image scale was 0.68"/pixel, but doubled the resolution in Photoshop before my final processing.

Formerly a star like our Sun, it is now just a cloud of ionized gas being pushed out into space by the remnants of the star’s core, visible as a small bright dot in the middle of the cloud. It was discovered by Lewis Swift in early September 1888. It lies close to the 10th magnitude star BD +60° 0631.


Sky plot

Sky plot


IC 289 • Planetary Nebula (My Smallest DSO), 


            Douglas J Struble