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GUM-15 / RCW 32 in Ha + SII, 


            Chris Ryan
GUM-15 / RCW 32 in Ha + SII
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GUM-15 / RCW 32 in Ha + SII

Technical card

Imaging telescopes or lenses:Sharpstar Optics 107 PH

Imaging cameras:ZWO ASI 1600mm-c

Mounts:iOptron CEM120EC2

Guiding telescopes or lenses:Sharpstar Optics 107 PH

Guiding cameras:ZWO ASI 174MM

Focal reducers:TS-Optics Field Flattener 2.5 1.0x


Filters:Baader SII 36mm 7nmBaader Ha 36 mm 7 nm

Accessory:Celestron OAGSharpsky Pro Focus Controller

Dates:April 5, 2020April 6, 2020April 7, 2020April 11, 2020April 14, 2020April 15, 2020April 16, 2020May 1, 2020May 2, 2020May 3, 2020May 8, 2020May 11, 2020

Baader Ha 36 mm 7 nm: 177x300" (gain: 75.00) -15C bin 1x1
Baader SII 36mm 7nm: 123x300" (gain: 75.00) -15C bin 1x1

Integration: 25.0 hours

Avg. Moon age: 15.65 days

Avg. Moon phase: 73.81%

Basic astrometry details job: 3505404

RA center: 8h 44' 37"

DEC center: -41° 16' 22"

Pixel scale: 0.750 arcsec/pixel

Orientation: 18.502 degrees

Field radius: 0.456 degrees

Resolution: 3198x2998

Locations: Home, Flaxton, QLD, Australia

Data source: Backyard


This is a mix of Ha and SII data. I did not bother with OIII as there was nothing there that I could see when I took a test shot. As it stands, the SII is also quite faint, so the Ha is just super dominant.

I did the channels as:

G: Ha 50% + SII 50%
B: Ha

Revision B shows the wider field - the parts to the top/right are heading into GUM-14.



Chris Ryan
License: Attribution-NonCommercial-ShareAlike Creative Commons


  • Final
    GUM-15 / RCW 32 in Ha + SII, 


            Chris Ryan
  • GUM-15 / RCW 32 in Ha + SII, 


            Chris Ryan

Sky plot

Sky plot


GUM-15 / RCW 32 in Ha + SII, 


            Chris Ryan