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Contains:  M 43, NGC 1982, NGC 1977, NGC 1980, M 42, Great Nebula in Orion, NGC 1976, The star 45Ori, The star ιOri, The star θ2Ori, The star θ1Ori, The star 42Ori
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M42 - Orion Nebula, 


            Richard Francis
M42 - Orion Nebula

M42 - Orion Nebula

Technical card

Resolution: 2504x3326

Dates:Jan. 6, 2017

Astrodon Blue G2E: 5x300" bin 1x1
Astrodon Green G2E: 5x300" bin 1x1
Astrodon Lum G2E: 5x300" bin 1x1
Astrodon Red G2E: 5x300" bin 1x1

Integration: 1.7 hours

Avg. Moon age: 8.12 days

Avg. Moon phase: 57.79% job: 1405453

RA center: 83.822 degrees

DEC center: -5.388 degrees

Pixel scale: 1.408 arcsec/pixel

Orientation: 176.856 degrees

Field radius: 0.814 degrees

Locations: Le Bourdieu Observatory, La Romieu, France

Data source: Backyard


M42, the Orion Nebula, is probably the best-known nebula of all, since it is visible to the naked eye. It is a prominent part of the “sword of Orion”, beneath (south of) the 3 stars of the belt, and the whole sword is shown in this image. At about 1300 light-years away it is the closest region of massive star formation to the Earth.

This LRGB image is a work in progress. It consists of a set of 300 sec images during one night and is very clearly overexposed: the Trapezium region in the centre is totally saturated. The next step will be to use shorter exposures, probably 60 seconds. I also have some internal reflections from bright stars showing up as little triangles.

More work needed!



Richard Francis
License: Attribution-NonCommercial-NoDerivs Creative Commons


  • M42 - Orion Nebula, 


            Richard Francis
  • Final
    M42 - Orion Nebula, 


            Richard Francis


Redid the post-processing only -- I still need to collect more data. But it's raining and close to full moon ;-(

Sky plot

Sky plot


M42 - Orion Nebula, 


            Richard Francis