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Contains:  NGC 6207, M 13, Great Cluster in Hercules, NGC 6205
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Messier 13 Globular Cluster in Hercules, 


            Harri Heikkinen
Messier 13 Globular Cluster in Hercules

Messier 13 Globular Cluster in Hercules

Technical card

Resolution: 2010x1296

Dates:April 19, 2019

27x120" ISO1600
38x60" ISO1600

Integration: 1.5 hours

Darks: ~20

Flats: ~40

Flat darks: ~20

Bias: ~20

Avg. Moon age: 14.80 days

Avg. Moon phase: 100.00%

Bortle Dark-Sky Scale: 8.00

Temperature: 5.00 job: 2654055

RA center: 250.415 degrees

DEC center: 36.464 degrees

Pixel scale: 4.281 arcsec/pixel

Orientation: 91.344 degrees

Field radius: 1.422 degrees

Locations: Backyard, Vantaa, Finland

Data source: Backyard


Testing autoguiding Az-Gti mount in EQ mode with 500mm f8.0 Maksutov-Cassegrain MTO MC-3M 5CA in heavily light polluted backyard. This will be my new travel setup, well under 10kg with everything included.

Hercules cluster would benefit from longer focal length but it was bright enough for f/8 lens in full moon and conveniently clearing past neighbor's tree so thought why not try a wide field.. Turned out better than expected.

Polar aligning this mount is a challenge as there is no polar scope, luckily Sharpcap's very handy polar align feature came to the rescue. PHD2 guiding graph was all over the place but surprisingly most of the subs were keepers - apart from the ones discarded due to passing thin clouds.

Canon 1100d ISO 1600 (unmodified) and Altair GPCAM2 224c with 50mm FL C-mount lens as guidescope. Lights 27x120" + 38x60". Calibration: 40 flats, 20 darks, 20 dark flats, 20 bias.



Harri Heikkinen
License: None (All rights reserved)


  • Messier 13 Globular Cluster in Hercules, 


            Harri Heikkinen
  • Final
    Messier 13 Globular Cluster in Hercules, 


            Harri Heikkinen

Sky plot

Sky plot


Messier 13 Globular Cluster in Hercules, 


            Harri Heikkinen