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Contains:  M 43, NGC 1982, NGC 1977, NGC 1980, M 42, Great Nebula in Orion, NGC 1976, NGC 1975, NGC 1981, NGC 1973, The star 45Ori, The star ιOri, The star θ2Ori, The star θ1Ori, The star 42Ori
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M42 Mosaic gone South, 


            Doug.,N. Jiang
M42 Mosaic gone South

M42 Mosaic gone South

Technical card

Resolution: 5622x4497

Dates:Feb. 1, 2019March 1, 2019

Astrodon Ha 1.25 5nm: 783x120" bin 1x1
Astrodon LRGB 1.25" E series Gen 2 - G: 997x60" bin 1x1

Integration: 42.7 hours

Avg. Moon age: 25.71 days

Avg. Moon phase: 16.10% job: 2594045

RA center: 83.552 degrees

DEC center: -5.192 degrees

Pixel scale: 1.266 arcsec/pixel

Orientation: 75.760 degrees

Field radius: 1.266 degrees

Locations: Gemini observatory, Lijiang, Yunan, P.R.China, Gaomeigu, Yunan, China

Data source: Own remote observatory

Remote source: Lijiang Gemini Observatory


This is the first image coming out from the remote site, yet due to various reasons remained unfinished.

It was an ambitious project that originally requires 6 panes Mosaic. it was proven that i was a bit over my head for my first Mosaic. Eventually i ended up with only 5 panes of G and Ha completed. Countless frames dumped due to various reasons. I have no choice but cut it short for 4 panes and plug up the sink hole. The image is of 5,622 x 4,497 in size with total integration of 1,780 frames. Images are acquired in February 2019.

I have mapped the color into HaGG format. Hence, the red in the image is mostly the emission portion of the M42 and the running man. This mapping yield few interesting structural details that i was unaware of before.



Doug.,N. Jiang
License: None (All rights reserved)

Sky plot

Sky plot


M42 Mosaic gone South, 


            Doug.,N. Jiang