Hercules Globular Cluster
|Rektascenzija||16 : 41.7 (u:m)
|Deklinacija||+36 : 28 (sto:m)
|Razdalja||22.8 (*1000 sv.l.)
|Vizual. magnituda||5.8 (mag)
|Zorni kot||16.6 (loc min)
M13, also called the `Great globular cluster in Hercules', is one of the most prominent and best known globulars of the Northern celestial hemisphere. It was discovered by Edmond Halley in 1714, who noted that `it shows itself to the naked eye when the sky is serene and the Moon absent.' According to Messier it is also reported in John Bevis' "English" Celestial Atlas.
At its distance of 22,200 light years, its angular diameter of 23' corresponds to 150 light years. 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).
According to Kenneth Glyn Jones, M13 is peculiar in containing one young blue star, Barnard No. 29, of spectral type B2. The membership of this star was confirmed by radial velocity measurement, and is strange for such an old cluster - apparently it is a captured field star.
Observers note 4 apparently star-poor regions in M13 (e.g., Mallas). Suggestions of them can be noted in some photos.
Globular cluster M13 was selected in 1974 as target for one of the first radio messages addressed to possible extra-terrestrial intelligent races, and sent by the big radio telescope of the Arecibo Observatory. Of course, this message will take about 23,000 years to reach the cluster, so that an answer cannot be expected for 46,000 years (thanks to Larry Klaes for this hint).
Nearby, about 40 arc minutes north-east, is the faint (mag 11) galaxy
NGC 6207, visible in many large- and medium-size-field photographs of M13,
e.g., in the DSSM image.