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Contains:  NGC 6207, M 13, Great Cluster in Hercules, NGC 6205
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M13 The Great Hercules Cluster; Hercules, 


            Thomas V. Davis
M13 The Great Hercules Cluster; Hercules

M13 The Great Hercules Cluster; Hercules

Technical card

Resolution: 5000x3266 job: 2099080

RA center: 250.433 degrees

DEC center: 36.445 degrees

Pixel scale: 1.336 arcsec/pixel

Orientation: 270.961 degrees

Field radius: 1.108 degrees

Data source: Backyard


M13 The Great Hercules Cluster; Hercules
Astro Systeme Austria N12 f/3.5 astrograph
Total Exposure 2+ Hours;  LRGB  40:30:30:30 min;  unbinned
April 27-28, 2007;  Inkom, ID

Comments:  The largest globular cluster seen from northern latitudes, the Hercules cluster can been seen with the unaided eye against very darks skies as a very faint, fuzzy "star".  Through a modest telescope many of the stars may be resolved. A closer view of the core may be seen here.
At its distance of 25,100 light years, its angular diameter of 20' corresponds to a linear 145 light years - visually, it is perhaps 13' large. It contains several 100,000 stars; Timothy Ferris in his book Galaxies even says "more than a million". Towards its center, stars are about 500 times more concentrated than in the solar neighborhood. The age of M13 has been determined by Sandage as 24 billion years and by Arp as 17 billion years around 1960; Arp later (in 1962) revised his value to 14 billion years (taken from Kenneth Glyn Jones) [from SEDS].

This image was a NASA APOD, May 18, 2007.



Thomas V. Davis
License: None (All rights reserved)

Sky plot

Sky plot


M13 The Great Hercules Cluster; Hercules, 


            Thomas V. Davis