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The Mighty Three - Giants in the Clouds and Shadows, 



    
        

            Min Xie
The Mighty Three - Giants in the Clouds and Shadows, 



    
        

            Min Xie

The Mighty Three - Giants in the Clouds and Shadows

Technical card

Imaging telescopes or lenses: Takahashi FSQ-106EDX III  ·  QHYCCD PoleMaster

Imaging cameras: ASI1600mm Pro

Mounts: Astro-Physics Mach1GTO CP3

Guiding telescopes or lenses: QHYCCD QHYOAG-M

Guiding cameras: ZWO ASI120mm-Mini

Focal reducers: Takahashi 0.6x f/3.0 Reducer

Software: ProDigital Software StarSpikes Pro 4  ·  StarNet++  ·  Adobe Lightroom Classic 2019  ·  Adobe Photoshop 2020  ·  Astro Pixel Processor  ·  Sequence Generator Pro  ·  PixInsight 1.8 Ripley

Filters: Chroma 31mm Green  ·  Chroma 31mm Red  ·  Chroma 31mm Blue  ·  Chroma 31mm S-II 3nm  ·  Chroma 31mm O-III 3nm (Optimized for f/3.0)  ·  Chroma 31mm Ha 3nm (Optimized for f/3.0)  ·  Astrodon 3nm SII 31mm  ·  Astrodon 3nm OIII 31mm  ·  Astrodon 3nm Ha 31mm

Accessory: MoonLite NiteCrawler WR35 Focuser  ·  ZWO EFW  ·  Kingdel NC860 (i7-8550U)


Dates:May 29, 2020May 30, 2020May 31, 2020June 3, 2020June 4, 2020June 10, 2020June 11, 2020June 12, 2020June 13, 2020June 14, 2020June 15, 2020June 16, 2020June 17, 2020June 18, 2020June 24, 2020June 25, 2020June 26, 2020June 27, 2020July 8, 2020July 9, 2020July 10, 2020July 11, 2020July 12, 2020July 13, 2020July 14, 2020July 15, 2020July 16, 2020July 17, 2020July 18, 2020July 19, 2020July 20, 2020July 21, 2020July 23, 2020July 24, 2020July 25, 2020July 26, 2020July 27, 2020Aug. 7, 2020Aug. 8, 2020Aug. 9, 2020

Frames:
Chroma 31mm Blue: 66x60" (gain: 0.00) -10C bin 1x1
Chroma 31mm Green: 66x60" (gain: 0.00) -10C bin 1x1
Chroma 31mm Ha 3nm (Optimized for f/3.0): 32x300" (gain: 139.00) -10C bin 1x1
Chroma 31mm O-III 3nm (Optimized for f/3.0): 73x300" (gain: 139.00) -10C bin 1x1
Chroma 31mm Red: 66x60" (gain: 0.00) -10C bin 1x1
Chroma 31mm S-II 3nm: 240x300" (gain: 139.00) -10C bin 1x1
Astrodon 3nm Ha 31mm: 332x300" (gain: 139.00) -10C bin 1x1
Astrodon 3nm OIII 31mm: 300x300" (gain: 139.00) -10C bin 1x1
Astrodon 3nm SII 31mm: 120x300" (gain: 139.00) -10C bin 1x1

Integration: 94.7 hours

Darks: ~40

Flats: ~40

Flat darks: ~40

Bias: ~40

Avg. Moon age: 16.71 days

Avg. Moon phase: 42.44%

Bortle Dark-Sky Scale: 9.00

Mean SQM: 17.96

Temperature: 32.00


Basic astrometry details

Astrometry.net job: 3754190


Resolution: 3394x7036

Locations: Backyard, Coppell, Texas, United States

Data source: Backyard

Description

Gum 84 (Sh2-54) region and the Eagle Nebula (M16) in the constellation Serpens, together with the Omega Nebula (M17) in the constellation Sagittarius, line up in the center part of the Milky Way galaxy. I am always fascinated by the rich features of this area and the surroundings.

The attempt was done in my city backyard. I tried a couple of color palettes and decided that a modified SHO palette expose the most details from narrowband channels. It's kind of a "dark theme" style. The whole image is made of 3 panels shot at 318mm focal lens with the ASI1600mm-Pro's 4/3 sensor. I might try to make a "natural color palette" version later. Hmm...

But, I love the starless version so much. Much much more dramatic.

I am glad that 9 narrowband masters and 9 RGB masters all come together successfully. The mosaic integration function of Astro Pixel Processor really delivers.

It's a quite long project over 40 nights (Gosh... 🤣 !). Learned quite a bit about the filters and the trade-off of the fast optics (well, fast optics really have serious performance impact by the sky glows from the heavy light pollution. I truly hope it could deliver at the dark sites!)

For the first time, I refuse to key in the acquisition details (there are just too many entries!). Let me summarize here.

Dates
2020/05/29 ~ 2020/08/09

Data Details
H-Alpha - 364 x 300s, Gain 139, -10C
Surfur-II - 360 x 300s, Gain 139, -10C
Oxygen-III - 373 x 300s, Gain 139, -10C
Red - 66 x 60s, Gain 0, -10C
Blue - 66 x 60s, Gain 0, -10C
Green - 66 x 60s, Gain 0, -10C

A little bit about the mosaic integration with Astro Pixel Processor. The light pollution is so bad that I have to integrate each channel for each pane separately, flat each of the masters, then perform mosaic registration again.

Pre-processing of Narrowband Masters

– Calibration / Integration, Astro Pixel Processor
- Dynamic Background Extraction for each channel master on each target, PixInsight
– Mosaic Integration, Astro Pixel Processor
- Dynamic Background Extraction for each channel's mosaic master, PixInsight
– Deconvolution, PixInsight (H-Alpha)
– MultiscaleLinearTransform (Denoise), PixInsight
- Range Selection, PixInsight
- PixelMath, PixInsight
– ScreenTransferFunction / HistogramTransformation, PixInsight.

Pre-processing of RGB Masters

– Calibration / Integration, Astro Pixel Processor
- Dynamic Background Extraction for each channel master on each target, PixInsight
– Mosaic Integration, Astro Pixel Processor
- Dynamic Background Extraction for each channel's mosaic master, PixInsight
– MorphologicalTransformation, PixInsight
– ScreenTransferFunction / HistogramTransformation, PixInsight.

RGB Combination

– LRGBCombination, PixInsight
– MorphologicalTransformation, PixInsight
– ScreenTransferFunction / HistogramTransformation, PixInsight.

Narrowband Combination

- SHO-AIP script, PixInsight
- ColorMask script, PixInsight
- CurveTransformation
– PixelMath, PixInsight
– ScreenTransferFunction / HistogramTransformation, PixInsight.

Narrband & RGB Combination

– PixelMath, PixInsight
- Detail adjustments, Adobe Photoshop CS
– Final Export, Photoshop

Comments

Author

mxcoppell
Min Xie
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Revisions

  • The Mighty Three - Giants in the Clouds and Shadows, 



    
        

            Min Xie
    Original
  • Final
    The Mighty Three - Giants in the Clouds and Shadows, 



    
        

            Min Xie
    B
  • The Mighty Three - Giants in the Clouds and Shadows, 



    
        

            Min Xie
    C

B

Description:Dramatic starless version. My favorite...

C

Description: Synthetic Luminance Layer

Sky plot

Sky plot

Histogram

The Mighty Three - Giants in the Clouds and Shadows, 



    
        

            Min Xie