Hemisphere:  Northern  ·  Contains:  Hercules Globular Cluster  ·  IC 4617  ·  M 13  ·  NGC 6205
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Messier 13, 


            Alf Jacob Nilsen
Messier 13
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Technical card

Imaging telescopes or lenses: GSO RC 254/2000 Carbon OTA

Imaging cameras: ZWO ASI1600 Pro

Mounts: iOptron CEM60-EC

Guiding telescopes or lenses: Skywatcher EvoGuide 50ED

Guiding cameras: Starlight Xpress Lodestar 2

Software: Astro Pixel Processor APP  ·  Adobe Photoshop CC  ·  PixInsight Core Version 1.8 Ripley

Filters: Baader 36mm R  ·  Baader 36mm G  ·  Baader 36mm B

Accessory: Optec TCF-S

Dates:Sept. 18, 2020Sept. 27, 2020

Baader 36mm B: 15x180" -20C bin 2x2
Baader 36mm G: 21x180" -20C bin 2x2
Baader 36mm R: 21x180" -20C bin 2x2

Integration: 2.8 hours

Flats: ~20

Avg. Moon age: 5.97 days

Avg. Moon phase: 42.19%

Basic astrometry details

Astrometry.net job: 3966394

RA center: 16h 41' 49"

DEC center: +36° 26' 45"

Pixel scale: 0.885 arcsec/pixel

Orientation: 86.683 degrees

Field radius: 0.315 degrees

Resolution: 2000x1600

Locations: Osmundstø Observatorium (private backyard observatory), Hidrasund, Vest Agder, Norway

Data source: Backyard


I struggled with this image. Originally I included LUM-portions, but due to bad seeing, light pollution and poor LUM-flats, I decided to go for a pure RGB-image of this stunning cluster of stars. Two nights a week apart.... enjoy...



Alf Jacob Nilsen
License: None (All rights reserved)

Sky plot

Sky plot


Messier 13, 


            Alf Jacob Nilsen