Hemisphere:  Southern  ·  Contains:  Great Orion Nebula  ·  IC 420  ·  IC 430  ·  Lower Sword  ·  M 42  ·  M 43  ·  Mairan's Nebula  ·  NGC 1973  ·  NGC 1975  ·  NGC 1976  ·  NGC 1977  ·  NGC 1980  ·  NGC 1981  ·  NGC 1982  ·  Orion Nebula  ·  The star 42Ori  ·  The star 45Ori  ·  The star 49Ori  ·  The star θ1Ori  ·  The star θ2Ori  ·  The star ιOri  ·  The star υOri  ·  Upper Sword  ·  the Running Man Nebula
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Messier 42, 


            Alf Jacob Nilsen
Messier 42
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Technical card

Imaging telescopes or lenses: Celestron RASA8

Imaging cameras: ZWO ASI ASI2600c

Mounts: iOptron GEM45EC

Guiding telescopes or lenses: ZWO 30mm f/4 Mini Guide Scope

Guiding cameras: ZWO ASI 120 Mini Mono

Software: Astro Pixel Processor APP  ·  Adobe Photoshop CC  ·  PixInsight Core Version 1.8 Ripley

Filters: IDAS (Tokai) LP-filter

Dates:Jan. 6, 2021

Frames: 93x30"

Integration: 0.8 hours

Avg. Moon age: 22.24 days

Avg. Moon phase: 48.98%

Basic astrometry details

Astrometry.net job: 4144000

RA center: 5h 35' 10"

DEC center: -5° 36' 50"

Pixel scale: 8.336 arcsec/pixel

Orientation: 2.388 degrees

Field radius: 2.931 degrees

Resolution: 2000x1552

Locations: Osmundstø Observatorium (private backyard observatory), Hidrasund, Vest Agder, Norway

Data source: Backyard


I still had some darness left when M42 became visible over the garage roof on the night of 6th January. Crystal clear and good seeing is rare here along the coast of south-western Norway. I gave the Great Nebula a try with only 93x30secs exporsure before it hit the rooftop. Amazing with th RASA astrograph can record in a short time! Enjoy, comments are welcome!



Alf Jacob Nilsen
License: None (All rights reserved)

Sky plot

Sky plot


Messier 42, 


            Alf Jacob Nilsen