Hemisphere:  Southern  ·  Constellation: Orion (Ori)  ·  Contains:  Great Orion Nebula  ·  Lower Sword  ·  M 42  ·  M 43  ·  Mairan's Nebula  ·  NGC 1973  ·  NGC 1975  ·  NGC 1976  ·  NGC 1977  ·  NGC 1980  ·  NGC 1982  ·  Orion Nebula  ·  The star 42Ori  ·  The star 45Ori  ·  The star θ1Ori  ·  The star θ2Ori  ·  The star ιOri  ·  the Running Man Nebula
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First Mono Image- M42 Orion Nebula, 


            Rex Robichaux
First Mono Image- M42 Orion Nebula
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First Mono Image- M42 Orion Nebula

Technical card

Imaging telescopes or lenses: TSOptics photoline apo 130/905 F/7

Imaging cameras: ZWO ASI1600mm Mono

Mounts: SkyWatcher EQ6-R Pro

Guiding telescopes or lenses: Primalucelab 60mm guidescope

Guiding cameras: Orion Starshoot Autoguider Starshoot autoguider

Focal reducers: TS-Optics 2-5" 0.8x Reducer and Flattener TS-Optics .80 Reducer / Flattener

Software: PHD2  ·  APT - Astro Photography Tool APT 2.43  ·  Adobe Light room CC  ·  DSS

Filters: Astrodon L  ·  Astrodon B  ·  Astrodon G  ·  Astrodon R

Accessory: QHY Polemaster Polemaster

Dates:Feb. 16, 2021

Astrodon B: 28x60" (gain: 139.00) -20C bin 1x1
Astrodon G: 30x60" (gain: 139.00) -20C bin 1x1
Astrodon L: 50x10" (gain: 139.00) -20C bin 1x1
Astrodon L: 75x60" (gain: 139.00) -20C bin 1x1
Astrodon R: 30x60" (gain: 139.00) -20C bin 1x1

Integration: 2.9 hours

Darks: ~30

Avg. Moon age: 4.46 days

Avg. Moon phase: 20.88%

Bortle Dark-Sky Scale: 5.00

Basic astrometry details

Astrometry.net job: 4228577

RA center: 5h 34' 50"

DEC center: -5° 18' 18"

Pixel scale: 1.077 arcsec/pixel

Orientation: 358.857 degrees

Field radius: 0.805 degrees

Resolution: 3162x4352

Locations: Home, Glen Allen, Virginia, United States

Data source: Backyard


Here's my first try at mono imaging with a huge shout-out to my good friend @gazingoutwards for making it possible with the ASI1600MM camera and Astrodon filters! This was a really neat learning experience and I'm excited for more clear nights to keep learning the ins and outs of mono imaging and processing.

I love the Orion Nebula... aside from (maybe) the Andromeda Galaxy... I can't think of any other object in the sky that is as easily recognizable and picturesque so it seemed like a good target to shoot for with my first mono image.

Due to the vast variation in brightness, M42 is actually pretty difficult to capture in a single exposure length. Due to this, I captured 50 10 second exposures for the brighter areas and merged that with 75 60 second exposures of the dimmer areas to get the best of both extremes. In hindsight, a medium 30-second setting would have helped....as would some 120-second shots for the really faint surrounding dust and gas areas. Oh well, space isn't going anywhere so there's always next year!

Image specs:
Taken 2/16/2021 with Zwo 1600MM Camera, TS Optics 130AP0 reduced .80, Skywatcher EQ6-R Mount, Astrodon LRGB filters.

Luminance= 75x60" & 50x10"
Red = 30x60"
Green = 30x60"
Blue = 28x60" (clouds rolled in)
30 dark frames, no flats or dark flats... I was just too excited to get the data processed.
Total integration time = 2.8hrs