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 1981  ·  NGC 1982  ·  Orion Nebula  ·  The star 42Ori  ·  The star 45Ori  ·  The star θ1Ori  ·  The star θ2Ori  ·  The star ιOri  ·  Upper Sword  ·  the Running Man Nebula
Great Nebula in Orion, 


            Johannes Grimm
Great Nebula in Orion
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Technical card

Imaging telescopes or lenses: Tamron 70-200 f/2.8 G2

Imaging cameras: Nikon D7500

Mounts: Sky-Watcher Star Adventurer

Guiding telescopes or lenses: Orion Mini 50mm Guidescope

Guiding cameras: ZWO asi1200MM Mini

Software: Affinity Photo  ·  DeepSkyStacker  ·  Adobe Lightroom 6  ·  Siril  ·  StarNet++

Filters: Haida Clear-Night Filter - 100mm

Accessory: ZWO ASIair  ·  Vanguard VEO 265AB

Dates:Jan. 10, 2021

Frames: 39x117"

Integration: 1.3 hours

Avg. Moon age: 26.60 days

Avg. Moon phase: 9.40%

Basic astrometry details

Astrometry.net job: 4146965

RA center: 5h 34' 54"

DEC center: -5° 11' 45"

Pixel scale: 2.226 arcsec/pixel

Orientation: 359.737 degrees

Field radius: 1.211 degrees

Resolution: 2153x3272

Data source: Traveller


This is this year's retake of the great nebula in Orion. This time I (or the ASIair) screwed up. Originally I wanted to take as many 2min exposures at ISO 200 as possible but after refocussing my lens after the first shots something, I don't know what, went wrong and I ended up with the most pictures taken at ISO 1600.

Naturally, the core was totally saturated and to salvage the image I tried something I meant to try for a long time: an HDR-merge of two different exposures. The image above is the result.


Sky plot

Sky plot


Great Nebula in Orion, 


            Johannes Grimm