Hemisphere:  Southern  ·  Constellation: Orion (Ori)  ·  Contains:  Extremely wide field
Orion's Belt & Sword (Astrotracer), 


Orion's Belt & Sword (Astrotracer)
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Orion's Belt & Sword (Astrotracer)

Technical card

Imaging telescopes or lenses: SMC Pentax-M 100mm f/2.8

Imaging cameras: Pentax K-3 II

Dates:Oct. 27, 2019

Frames: 3x30" ISO800

Integration: 0.0 hours

Avg. Moon age: 28.78 days

Avg. Moon phase: 0.63%

Bortle Dark-Sky Scale: 2.00

Basic astrometry details

Astrometry.net job: 3258556

RA center: 5h 38' 8"

DEC center: -2° 50' 49"

Pixel scale: 22.121 arcsec/pixel

Orientation: 349.888 degrees

Field radius: 7.195 degrees

Resolution: 1341x1920

Data source: Traveller


Taken at Mather Point, Grand Canyon National Park (South Rim). The streaks near and through M42 are from geosynchronous satellites. The lens was stopped down to f/4. Tracking was done internally with the camera's Astrotracer feature (no external tracker required).

Sequator was used for stacking. DBE in PixInsight LE was used for (minor) gradient reduction. Rnc-color-stretch was used for stretching. No flats, bias or dark frames were used but I aggressively dithered and used kappa-sigma clipping during stacking. (Given the ambient temperature - around freezing - there were probably not many hot pixels in any case.)

More aggressive stretching and better processing techniques overall would improve this image and I will revise when I learn more about processing.

If you are wondering why such a pitifully short total exposure (only 1.5 minutes), part of the reason is that wind gusts at the edge of the canyon were so strong that most of my sub-frames were ruined by vibration of the light travel tripod I was using. A hard lesson but live and learn.


Sky plot

Sky plot


Orion's Belt & Sword (Astrotracer),