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


            Steven Hanaway
The Hercules Globular Cluster, Messier 13

The Hercules Globular Cluster, Messier 13

Technical card

Resolution: 4124x2802

Dates:Jan. 30, 2018

Frames: 64x120"

Integration: 2.1 hours

Avg. Moon age: 13.54 days

Avg. Moon phase: 98.31% job: 1920805

RA center: 250.423 degrees

DEC center: 36.465 degrees

Pixel scale: 1.216 arcsec/pixel

Orientation: 271.616 degrees

Field radius: 0.842 degrees

Locations: The Sidewinder Observatory, San Marcos, Texas, United States


Good afternoon everyone! Today's image is The Hercules Globular Cluster, catalogued as Messier 13. This globular cluster contains over a quarter of a million stars, and lies some 22 thousand light years away from Earth in the Constellation Hercules. The brightest star in this globular cluster is a variable brightness red giant, catalogued as V11. V11 has an apparent visual magnitude (brightness) of 11.95 and the globular cluster itself has a apparent visual magnitude of 5.8, making this object barely visible to the naked eye, and an object that is easily seen in binoculars and small telescopes. In 1974, the Arecibo radio telescope sent a message to this globular cluster with information including human DNA, data about the human race, where Earth is, and some other information. Unfortunately, due to the density of globular clusters, it is unlikely that any planets which would be able to sustain life would last long inside of a globular cluster, as the orbits of almost all planets would be unstable over long time scales. Even if intelligent life does receive our message, and decides to respond, it will still take 44,000 years to hear a reply because of the speed of light (speed of causailty.) I hope you like today's image, and information. Clear skies!



Steven Hanaway
License: Attribution-NonCommercial-NoDerivs Creative Commons

Sky plot

Sky plot


The Hercules Globular Cluster, Messier 13, 


            Steven Hanaway