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Contains:  Great Cluster in Hercules, Hercules globular cluster, IC4617, M 13, M13, NGC 6205, NGC 6207, NGC6207
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M13 - Hercules Globular Cluster (2019), 


            Kurt Zeppetello
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M13 - Hercules Globular Cluster (2019)

Technical card

Dates:June 11, 2019June 14, 2019

ZWO B 1.25" optimized for ASI1600: 58x60" (gain: 139.00) -10C bin 1x1
ZWO G 1.25" optimized for ASI1600: 49x60" (gain: 139.00) -10C bin 1x1
ZWO R 1.25" optimized for ASI1600: 60x60" (gain: 139.00) -10C bin 1x1

Integration: 2.8 hours

Darks: ~12

Flats: ~15

Bias: ~20

Avg. Moon age: 10.31 days

Avg. Moon phase: 77.56%

Bortle Dark-Sky Scale: 5.00

Temperature: 10.00 job: 2754117

RA center: 16h 41' 42"

DEC center: +36° 28' 3"

Pixel scale: 1.205 arcsec/pixel

Orientation: -81.407 degrees

Field radius: 0.638 degrees

Resolution: 3054x2286

Data source: Backyard


This is my latest version of M13. Like all globular clusters, M13 or the Hercules Globular Cluster (NGC 6205), does not reside in the galactic plane but rather outside surrounding the central bulge. The cluster contains several hundred thousand stars, a diameter of 145 light-years and is 22,000 light years away. The cluster, like most clusters, contains very old stars on the order of 12 to 13 billion years old, however, this cluster is of particular interest because it produces young blue stragglers - large blue giant stars formed as result of colliding old stars.

I find globular clusters particularly difficult to process for some reason. Possibly because the data is never as good as it could be because I am always imaging these under less than ideal circumstances like when the moon is out - this image is no exception. Also, the green layer was fine this time around as opposed to having those magenta splotches plaguing my last image. I was prepared to stack everything in DSS, however, PI worked fine this time (astro-gremlins?).

I did manage to get more color than my previous images which was very happy with. I rotated the image 90 degrees and cropped it in such a way to maximize the small ~12th magnitude spiral galaxy on the lower left of the image. Despite being 46 million light-years away there is a small amount of structure.



Kurt Zeppetello
License: None (All rights reserved)

Sky plot

Sky plot


M13 - Hercules Globular Cluster (2019), 


            Kurt Zeppetello