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Hemisphere:  Northern
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Sh2-170 • The Little Rosette Nebula in SHO, 


            Douglas J Struble
Sh2-170 • The Little Rosette Nebula in SHO
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Sh2-170 • The Little Rosette Nebula in SHO

Technical card

Imaging telescopes or lenses: GSO 12" F4 Newtonian Truss

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: PHD2  ·  Sequence Generator Pro  ·  PixInsight  ·  Photoshop CS5

Filters: Astrodon Ha 5nm  ·  Astrodon SII 3nm  ·  Astrodon OIII 3nm

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

Dates:Oct. 21, 2018Oct. 22, 2018Oct. 23, 2018Oct. 24, 2018Oct. 25, 2018Oct. 26, 2018

Astrodon Ha 5nm: 228x120" (gain: 200.00) -20C bin 1x1
Astrodon Ha 5nm: 206x240" (gain: 75.00) -20C bin 1x1
Astrodon OIII 3nm: 39x120" (gain: 200.00) -20C bin 1x1
Astrodon OIII 3nm: 105x240" (gain: 75.00) -20C bin 1x1
Astrodon SII 3nm: 118x120" (gain: 200.00) -20C
Astrodon SII 3nm: 90x240" (gain: 75.00) -20C bin 1x1

Integration: 39.6 hours

Darks: ~50

Flats: ~50

Bias: ~250

Avg. Moon age: 14.09 days

Avg. Moon phase: 96.34%

Bortle Dark-Sky Scale: 8.00

Basic astrometry details job: 3368143

RA center: 0h 1' 36"

DEC center: +64° 38' 45"

Pixel scale: 1.012 arcsec/pixel

Orientation: 357.735 degrees

Field radius: 0.491 degrees

Resolution: 2776x2120

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

Data source: Backyard


I captured this data set about a year ago when I was trying out a GSO 12" Newt. I wasn't really happy with my original processing, as I had a lot of light pollution issues with such a big mirror based telescope 15 minutes outside of Detroit. I reprocessed the data with some of may newer techniques and am much happier with it.

This small Sharpless object sits high in the northern fall sky north of SH2-171, which is a common object imaged and south of Abell 85; a supernova remnant. Often called the small rosette due to its resemblance to the original, this small Sharpless object is five times smaller in size and much less bright than the Rosette Nebula; therefore it is not a common imaged target.



Douglas J Struble
License: None (All rights reserved)

Sky plot

Sky plot


Sh2-170 • The Little Rosette Nebula in SHO, 


            Douglas J Struble