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
Powered byPixInsight
Great Nebula in Orion, 


            Johannes Grimm
Great Nebula in Orion
Powered byPixInsight

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" (1h 16' 3")

Integration: 1h 16' 3"

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