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Contains:  Great Nebula in Orion, M 42, M 43, NGC 1973, NGC 1975, NGC 1976, NGC 1977, NGC 1980, NGC 1982, The star 42Ori, The star 45Ori, The star θ1Ori, The star θ2Ori, The star ιOri
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M42 (the Great Orion Nebula), 


            Anders Johannesson
M42 (the Great Orion Nebula)
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M42 (the Great Orion Nebula)

Technical card

Imaging telescope or lens:Telescope Service (TS) TS 100Q

Imaging camera:Sony A7s A7S Standard

Mount:iOptron CEM60

Guiding telescope or lens:Telescope Service (TS) TS 100Q


Dates:Jan. 19, 2020

Frames: 102x30"

Integration: 0.8 hours

Avg. Moon age: 24.19 days

Avg. Moon phase: 28.98%

Basic astrometry details job: 3215510

RA center: 5h 36' 42"

DEC center: -5° 18' 39"

Pixel scale: 2.976 arcsec/pixel

Orientation: 9.535 degrees

Field radius: 1.440 degrees

Resolution: 2797x2077

Locations: Home observatory, Hollviken, Sweden

Data source: Backyard


Probably the most photographed object in the sky. M42 is a large birthplace for stars that is so close that we can see many details. From our planet it is one of the brightest gas nebulae. The distance to M42 is 1300 light years.

To catch the high dynamic range of this object, two sets of images are used. They differ only in gain setting (ISO 3200 and ISO 400). The exposure time is the same. This particular camera is using its best amplifier at the higher gain setting, and thus a better signal-to-noise, but the price is a lower dynamic range, thus the two image types. 94 high gain images are combined with 4 low gain images in PixInsight.



Anders Johannesson
License: None (All rights reserved)

Sky plot

Sky plot


M42 (the Great Orion Nebula), 


            Anders Johannesson