Contains: IC 430, NGC 1999, M 43, NGC 1982, NGC 1977, NGC 1980, M 42, Great Nebula in Orion, NGC 1976, NGC 1975, NGC 1981, NGC 1973, The star 49Ori, The star 45Ori, The star ιOri, The star θ2Ori, The star θ1Ori, The star 42Ori, The star υOri
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Technical card

Imaging telescope or lens: Borg 71FL

Imaging camera: Canon / CentralDS EOS 60D

Mount: Sky-Watcher EQ-6 Skyscan

Guiding telescope or lens: Borg 50 Achromat 50/250

Focal reducer: Borg Super reducer

Software: PixInsightO'Telescope BackyardEOS

Resolution: 2000x1333

Dates: March 9, 2013

Frames: 25x360" ISO1600 -20C

Integration: 2.5 hours

Avg. Moon age: 27.09 days

Avg. Moon phase: 6.58% job: 98212

RA center: 83.787 degrees

DEC center: -5.282 degrees

Pixel scale: 8.048 arcsec/pixel

Orientation: -88.612 degrees

Field radius: 2.686 degrees


The Great Orion Sword is one of the most known winter sky objects, and one of the most imaged portion of the sky. Visible by naked eye during winter, lies at the center of Orion Costellation.
I imaged it with my new Borg 71FL, with a focal length of 280mm (using #7879 reducer, @ f3.9), under very dark skies. The seeing was really poor and this affected the shape of starts, that are all “bloated”.

On my blog you can find the full process workflow in Pixinsight.



Emanuele Todini

Sky plot

Sky plot


M42 & NGC1975, Emanuele Todini

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O'Telescope BackyardEOS