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Contains:  NGC 2239, NGC 2244, NGC 2252, Rosette nebula, The star 12Mon
Getting plate-solving status, please wait...
HaS2O3RGB - Rosette Nebula, 


            Min Xie
HaS2O3RGB - Rosette Nebula
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HaS2O3RGB - Rosette Nebula

Technical card

Imaging telescopes or lenses: William Optics Gran Turismo 81 APO (2018)  ·  William Optics Camera Angle Rotator  ·  Celestron StarSense

Imaging cameras: ASI1600mm Pro

Mounts: Celestron Advanced VX

Guiding telescopes or lenses: QHYCCD QHYOAG-S

Guiding cameras: QHYCCD QHY5II-M

Focal reducers: William Optics Flat6A-II (x0.80)

Software: ProDigital Software StarSpikes Pro 4  ·  Adobe Photoshop CC 2016  ·  Astro Pixel Processor  ·  Sequence Generator Pro  ·  PixInsight 1.8 Ripley  ·  Adobe Lightroom 2017

Filters: Astrodon 3nm SII 31mm  ·  Astrodon 3nm OIII 31mm  ·  Astrodon 3nm Ha 31mm  ·  Astrodon E Series Gen II Blue 31mm  ·  Astrodon E Series Gen II Red 31mm  ·  Astrodon E Series Gen II Green 31mm

Accessory: PrimaLuceLab Sesto Senso Robotic Focusing Motor  ·  ZWO EFW  ·  Celestron SkySync GPS  ·  Kingdel NC860 (i7-8550U)

Dates:Nov. 17, 2018Nov. 20, 2018Nov. 26, 2018Nov. 30, 2018

Astrodon 3nm Ha 31mm: 120x180" (gain: 139.00) -20C bin 1x1
Astrodon 3nm OIII 31mm: 360x120" (gain: 139.00) -20C bin 1x1
Astrodon 3nm SII 31mm: 288x150" (gain: 139.00) -20C bin 1x1
Astrodon E Series Gen II Blue 31mm: 66x60" (gain: 74.00) -20C bin 1x1
Astrodon E Series Gen II Green 31mm: 67x60" (gain: 74.00) -20C bin 1x1
Astrodon E Series Gen II Red 31mm: 70x60" (gain: 74.00) -20C bin 1x1

Integration: 33.4 hours

Darks: ~30

Flats: ~30

Bias: ~80

Avg. Moon age: 15.49 days

Avg. Moon phase: 72.42%

Bortle Dark-Sky Scale: 5.00

Mean SQM: 19.92

Temperature: 5.50

Basic astrometry details job: 3248591

RA center: 6h 32' 9"

DEC center: +5° 1' 12"

Pixel scale: 2.857 arcsec/pixel

Orientation: 198.534 degrees

Field radius: 1.236 degrees

Resolution: 2560x1775

Locations: Backyard, Coppell, Texas, United States; TAS Atoka Dark Site, Atoka, Oklahoma, United States

Data source: Mix of multiple source


First of all, it's HARD to collect S-II and O-III data in the backyard!

12 hours of O-III and 12 hours of S-II data added to the previous HaRGB combination. No doubt that I didn't collect enough. Checking back the HaRGB, the sharpness of the details was not there either. I could blame the bad weather and entry-level equipments. :)

I do need a good mount to boost my courage on collecting data. The result is not that optimal. Only surprise is that the S-II signal added the touch of golden edges here and there. Tried to do the pure narrowband tone mapping and failed miserably. :(

This time I tried something different - I did most of the processing in non-linear state. This includes background level, de-noise in Photoshop and star removal in Straton.

Whatever it is, I will do this target again in the future when I find the "perfect" mount.

Pre-processing of Ha Master

- Calibration / Integration, Astro Pixel Processor
- Dynamic Background Extraction, PixInsight
- ScreenTransferFunction / HistogramTransformation, PixInsight.
- Dfine2, Photoshop
- Straton

HaS2O3RGB Combination & Post-processing

- NBRGBCombination Script, PixInsight
- Final Touch-up, Photoshop



Min Xie
License: Attribution-NonCommercial Creative Commons


  • Final
    HaS2O3RGB - Rosette Nebula, 


            Min Xie
  • HaS2O3RGB - Rosette Nebula, 


            Min Xie
  • HaS2O3RGB - Rosette Nebula, 


            Min Xie
  • HaS2O3RGB - Rosette Nebula, 


            Min Xie


Description:Starless Ha Master...


Description:Starless S-II Master...


Description:Starless O-III Master...

Sky plot

Sky plot


HaS2O3RGB - Rosette Nebula, 


            Min Xie