Hemisphere:  Northern  ·  Constellation: Orion (Ori)  ·  Contains:  Extremely wide field
Orion (Astrotracer), 


Orion (Astrotracer)
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Orion (Astrotracer)

Technical card

Imaging telescopes or lenses: SMC Pentax-A 50mm f/1.4

Imaging cameras: Pentax K-3 II

Dates:Oct. 27, 2019

Frames: 23x30" ISO400

Integration: 0.2 hours

Avg. Moon age: 28.78 days

Avg. Moon phase: 0.63%

Bortle Dark-Sky Scale: 2.00

Basic astrometry details

Astrometry.net job: 3258534

RA center: 5h 37' 56"

DEC center: +0° 3' 21"

Pixel scale: 48.447 arcsec/pixel

Orientation: 355.104 degrees

Field radius: 15.535 degrees

Resolution: 1282x1920

Data source: Traveller


Orion from Mather Point, Grand Canyon National Park (South Rim). This was shot with the lens stopped down to f/2.5. 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 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 only 11.5 minutes total exposure at such a fabulous dark-sky site (Bortle 2), it is because the majority of my sub-exposures were unfortunately ruined by wind shaking the small travel tripod I was using, which had to fit in my carry-on luggage. The gusts on the edge of the canyon were so strong I was actually a little worried that my tripod would get knocked over!


Sky plot

Sky plot


Orion (Astrotracer),