Hemisphere:  Southern  ·  Constellation: Orion (Ori)  ·  Contains:  41 the01 Ori  ·  43 the02 Ori  ·  De Mairan's nebula  ·  Great Nebula in Orion  ·  M 42  ·  M 43  ·  M43  ·  NGC 1976  ·  NGC 1982  ·  Sh2-281  ·  The star θ1Ori  ·  The star θ2Ori
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M42 Orion Nebula, 


            Michael Southam
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M42 Orion Nebula

Imaging cameras: Canon Rebel T5i

Mounts: CELESTRON Advanced VX

Guiding telescopes or lenses: SBIG SMS-ST-i-Guider

Guiding cameras: SBig SMS-ST-i-Guider

Focal reducers: Antares f/6.3 Focal Reducer for SCT

Software: Pleiades Astrophoto PixInsight 1.8 Ripley  ·  BinaryRivers Corporation Backyard EOS V3.0.3  ·  PHD Guiding  ·  Software Bisque Sky X Serious

Accessory: Celestron Skyris Filter Wheel

Dates:Dec. 5, 2015

Frames: 40x300" ISO200

Integration: 3.3 hours

Darks: ~10

Avg. Moon age: 24.07 days

Avg. Moon phase: 30.11%

Astrometry.net job: 878251

RA center: 5h 35' 0"

DEC center: -5° 25' 9"

Pixel scale: 0.727 arcsec/pixel

Orientation: 23.914 degrees

Field radius: 0.529 degrees

Resolution: 4092x3280

Locations: Home Observatory, Shelton, Connecticut, United States


This is my second attempt at M42 and my first guided image using a borrowed SBIG ST-i Guider. I took 40 x 300 second luminance subs and 10 x 20 second darks. I discarded 3 luminance frames due to minor star trails and stacked the balance. Took me a while to get the nebula in the center of the ring created by the focal reducer but once there, guide setup went quickly. I could see that the full 40 frames would take me to about 2am when M42 would be well past the Meridian and probably past the point of mount flip. I got the full 40 frames without a flip but PHD guiding failed to control the mount 2 frames before the end.

Very pleased with the end result compared to the same target this time last year.



  • M42 Orion Nebula, 


            Michael Southam
  • M42 Orion Nebula, 


            Michael Southam
  • M42 Orion Nebula, 


            Michael Southam
  • Final
    M42 Orion Nebula, 


            Michael Southam

Sky plot

Sky plot


M42 Orion Nebula, 


            Michael Southam