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Hemisphere:  Southern  ·  Contains:  Great Nebula in Orion, Horsehead nebula, IC 431, IC 432, IC 434, IC 435, M 42, M 43, M 78, NGC 1163, NGC 1172, NGC 1973, NGC 1975, NGC 1976, NGC 1977, NGC 1980, NGC 1981, NGC 1982, NGC 1999, NGC 2023, NGC 2024, NGC 2064, NGC 2067, NGC 2068, NGC 2071, The star 42Ori, The star 45Ori, The star Alnitak (ζOri), The star θ1Ori, The star θ2Ori, The star ιOri, The star σOri
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M42 - M78 Mosaic, 


            Dennis Sprinkle
M42 - M78 Mosaic
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M42 - M78 Mosaic

Technical card

Imaging telescopes or lenses: William Optics GT102 102mm f/6.9 Apo Refractor

Imaging cameras: ATIK 383L+ mono

Mounts: Astro-Physics Mach1GTO

Focal reducers: William Optics Flat 6A

Software: Pleiades Astrophoto PixInsight  ·  Photoshop  ·  PHD2 Guiding  ·  Sequence Generator Pro

Filters: Baader Green 36mm  ·  Baader Red 36mm  ·  Baader Blue 36mm  ·  Baader 7nm Ha 36mm

Baader 7nm Ha 36mm: 5x300" bin 1x1
Baader 7nm Ha 36mm: 128x900" bin 1x1
Baader Blue 36mm: 5x120" bin 1x1
Baader Blue 36mm: 70x300" bin 1x1
Baader Green 36mm: 5x120" bin 1x1
Baader Green 36mm: 65x300" bin 1x1
Baader Red 36mm: 5x120" bin 1x1
Baader Red 36mm: 66x300" bin 1x1

Integration: 49.7 hours

Basic astrometry details job: 1467969

RA center: 5h 41' 31"

DEC center: -2° 15' 28"

Pixel scale: 14.181 arcsec/pixel

Orientation: 64.951 degrees

Field radius: 4.805 degrees

Resolution: 2400x438

Locations: Fall Creek Falls State Park, Spencer, TN, United States


8 panel mosaic from Barnard's Loop to Orion Nebula for a total of 49.7 hours of HaRGB.

Software used to capture image:
Sequence Generator Pro

Software used to edit:

First 5 panels are made up of 7.5 hours of HaRGB
Ha: (20) 15 minutes
R: (10) 5 minutes
G: (10) 5 minutes
B: (10) 5 minutes

The remainder are a little less because I was running out of time each night to shoot it... but with them being brighter areas, they are actually cleaner images. I also shot a little over an hour of shorter exposures of HaRGB for the core of M42.

Camera : ATIK 383L+ Mono
Telescope: William Optics GT102 W_0.8x Reducer Flattener
Mount: Astro-Physics Mach1GTO



Dennis Sprinkle
License: None (All rights reserved)


  • M42 - M78 Mosaic, 


            Dennis Sprinkle
  • Final
    M42 - M78 Mosaic, 


            Dennis Sprinkle

Sky plot

Sky plot


M42 - M78 Mosaic, 


            Dennis Sprinkle