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Hemisphere:  Northern
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Sh2-235 • Rare Collision Nebula in HSS, 


            Douglas J Struble
Sh2-235 • Rare Collision Nebula in HSS
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Sh2-235 • Rare Collision Nebula in HSS

Technical card

Imaging telescopes or lenses: Explore Scientific 152 mm Carbon Fiber

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  ·  SkySafari Pro

Filters: Astrodon Ha 5nm  ·  Astrodon SII 3nm

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

Dates:Jan. 21, 2020Feb. 19, 2020

Astrodon Ha 5nm: 387x120" (gain: 200.00) -20C bin 1x1
Astrodon SII 3nm: 303x120" (gain: 200.00) -20C bin 1x1

Integration: 23.0 hours

Darks: ~50

Flats: ~50

Bias: ~250

Avg. Moon age: 25.95 days

Avg. Moon phase: 13.85%

Bortle Dark-Sky Scale: 8.00

Basic astrometry details job: 3290507

RA center: 5h 41' 17"

DEC center: +36° 3' 46"

Pixel scale: 0.649 arcsec/pixel

Orientation: 51.201 degrees

Field radius: 0.494 degrees

Resolution: 4396x3264

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

Data source: Backyard


I ended up totally reworking this. This is one of the few Ha and SII bicolor palettes I have processed. Sh2-235 is very unusual in that SII is way more prominent than OIII. While SII falls more in the red spectrum, I liked the way the texture popped more with the SII mapped in blue. My second goal was to pull out more detail in the core of Sh2-235.

SH2-235, as designated in the Sharpless catalog. It is a kidney shaped HII region formed when two large clouds of gas collided. The nebula is part of a larger complex consisting of SH 231,232 and 233. The complex lies in the constellation Auriga. The distance to SH2-235 is somewhat unclear. Observations made with the WISE space telescope indicate it lies between 5,219 and 8,154 light years from the Earth. Other estimates place it approximately 6,000 light years distance. Infrared studies of the object reveal extensive formation of new clusters of stars embedded within the cold clumps of gas and dust within the nebula.



Douglas J Struble
License: None (All rights reserved)


  • Sh2-235 • Rare Collision Nebula in HSS, 


            Douglas J Struble
  • Sh2-235 • Rare Collision Nebula in HSS, 


            Douglas J Struble
  • Final
    Sh2-235 • Rare Collision Nebula in HSS, 


            Douglas J Struble


Description: Shifting SII data to blue to add texture.


Description: Trying to find a happy medium between the original and the final. I think this fits the bill.

Sky plot

Sky plot


Sh2-235 • Rare Collision Nebula in HSS, 


            Douglas J Struble

In these public groups

Sharpless2 Objects