Hemisphere:  Southern  ·  Constellation: Orion (Ori)  ·  Contains:  Great Nebula in Orion  ·  M 42  ·  M 43  ·  NGC 1973  ·  NGC 1975  ·  NGC 1976  ·  NGC 1977  ·  NGC 1980  ·  NGC 1981  ·  NGC 1982  ·  The star 42Ori  ·  The star 45Ori  ·  The star θ1Ori  ·  The star θ2Ori  ·  The star ιOri
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            Russell Valentine
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            Russell Valentine
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Technical card

Imaging telescopes or lenses: Canon EFS 55-250mm Canon EFS 55-250 mm

Imaging cameras: Canon T3i 600D Canon 600d

Mounts: StarSync Tracker, Star Tracker

Software: SIRIL

Dates:Jan. 24, 2018

Frames: 65x10" (10' 50")

Integration: 10' 50"

Avg. Moon age: 6.96 days

Avg. Moon phase: 45.47%

Basic astrometry details

Astrometry.net job: 1927466

RA center: 5h 34' 57"

DEC center: -5° 28' 44"

Pixel scale: 3.711 arcsec/pixel

Orientation: 4.630 degrees

Field radius: 1.782 degrees

Resolution: 2480x2409

Locations: Lawrence, KS, Lawrence, Kansas, United States

Data source: Backyard



Taken Jan 24, 2018 in Lawrence, KS, USA probably Bortle 6 with a bright white LED streetlight right across the street.


Canon T3i unmodded using Ekos for camera control

StarSync Tracker with Latitude stand

Canon EF-S 55mm-250mm IS II Telephoto Lens set at f/5.6 250mm


Light 65x10", ISO1600

Darks 20x10" as the last exposures of the night

Flats 14x1/640" with a tshirt over the lens look at a light illuminated by the sun

Darks for Flats 22x1/640"

First Processed in Siril

Flats dark subtracted and stacked

Darks stacked

Lights dark subtracted and flats applied then registered and stacked

Processed in Darktable with modules:


White Balance

Base Curve

Contrast Brightness and Saturation

Processed in the Gimp with G'MIC plugin

G'MIC -> Details -> Dynamic range increase

Colors -> Brightness-Contrast

Croped and Scaled down

Not the best image but I was happy I can get some details with the light pollution and it being just a standard camera lens.

Most of the time was actually image transfer from Camera RAM through USB cable to computer, in the future I think I will leave the images on the sd card.


Sky plot

Sky plot




            Russell Valentine