M13 = NGC6205 ( 16h 41.7m +36°28´, 5.9 mag.)
Great Hercules Cluster was discovered by Halley in 1714 and Messier observed it on June 1, 1764. Approx. 23,400 ly distant and 160 ly in diameter, it contains more than 1 million stars.
M13
Imaged by Al Kelly using a Starlight Express MX916 and an 8 inch SCT.
Lydia:
Mr. Kelly you've had CCD images of yours published in Sky and Telescope?
M13 The Great Hercules Globular Cluster (globular cluster)
M92 (globular cluster) ...
M13 globular star cluster
Gravitational field demonstrated
Self-gravitating system
A self-gravitating system is a system of masses kept together by mutual gravity. An example is a star.
Globular cluster M13 is located in this area. M13 known as the Hercules cluster is regarded as the best globular cluster for viewing in the northern hemisphere.
El racimo globular M13 en la constelación Hércules.
Haz "click" en la imagen para una vista completa
Instituto de Ciencias del Telescopio Espacial y NASA.
M13 (NGC 6205, Great Cluster in Hercules)
M16 (NGC 6611)
M17 (NGC 6618, Omega Nebula)
M20 (NGC 6514, Trifid Nebula)
M27 (NGC 6853, Dumbbell Nebula)
M31 (NGC 224, Andromeda Galaxy)
M32 (NGC 221, companion to M31) ...
Frank Drake and Carl Sagan used the giant radio telescope at Arecibo in 1974 to send a pictogram to the inhabitants of the globular cluster M13 - it should get there in about 25,000 years, ...
In 1974, Frank Drake and his colleagues used the gigantic radio telescope at Arecibo, Puerto Rico to beam an elaborate coded message in the direction of a globular star cluster (a cluster of millions of stars) called M13.
Bright globular clusters include Omega Centauri, 47 Tucanae, and M13. In the Milky Way, all globular clusters are old. Most are members of the Galactic halo, and the rest are members of the thick disk. [C95] ...
f2 = K23 P / (2 π G) = M13 (sin3 i) / (M1 + M2)2
f1,2 then give you the masses of the stars. Note that the only observables here are the radial velocity amplitude, the period, and the inclination angle.
* The science fiction novellas "Sucker Bait" by Isaac Asimov and "Question and Answer" by Poul Anderson take place on Troas, a world within M13.
A 1,679 bit message was transmitted from the 305-meter Arecibo radio observatory dug into the ground in Puerto Rico toward the globular star cluster M13, about 25,000 light-years away.
giant globular star cluster in the northern constellation Hercules; cataloged as M13 or NGC 6205. The cluster is just visible to the naked eye and is the best example of a globular cluster visible in the Northern Hemisphere.
Also known as the Hercules cluster, M13 is perhaps the finest and most well known globular cluster in the Northern hemisphere. It originally was discovered by Edmond Halley in 1714.
It lies in the northwestern corner (16:10:24.3+43:49:3.5, ICRS 2000.0) of Constellation Hercules -- west of Sigma Herculis; south of Tau, Phi, and Nu Herculis; northwest of Eta Herculis and globular cluster M13; and east of Chi Herculis.
The most famous globular cluster visible from the Northern Hemisphere is M13 in the constellation Hercules, visible on spring and summer evenings. This cluster contains half a million or so of the Galaxy's most ancient stars.
The most amazing observation was that of NGC 6207, a galaxy just a degree north-east of M13. I have seen this little galaxy on five different occasions during the past year from my urban location.
One of the most beautiful globular clusters in the sky is M13, the famous Hercules Cluster. To the naked eye it is visible as a star of 4th mag. In smaller telescopes it appears as a misty patch being more dense towards the center.
The signal was directed to M13, a globular cluster in Hercules containing nearly 200,000 stars. Unfortunately it lies at a distance of 24,000 light years from the Earth so any reply will not be received for nearly 50,000 years! ...
Only once in the history of the human race have we purposely sent a radio message to the stars. In November. 1974 a message of greetings from the human race was sent toward M13. It will still be nearly 26,000 years before our message arrives there.
Alpha Herculis, a red giant star that varies from third to fourth magnitude, is called Rasalgethi, from the Arabic meaning ‘the kneeler's head'. The most celebrated object in the constellation is a globular cluster of stars, M13, ...
The M60 is a family of United States general purpose machine guns firing 7.62x51mm NATO Cartridge s from a disintegrating Belt of M13 links. It can fire three types of ammunition, ball, tracer, and armor piercing....
The four stars of the central trapezoid within Hercules, epsilon Her, zeta Her, eta Her, and pi Her, form the called Keystone. The globular star cluster M13 is located on the western part of the Keystone.
eye and has no bright stars rivaling Vega in adjoining Lyra or even the much fainter Gemma in Corona Borealis to the west. However, there are many interesting double stars in Hercules as well as the northern hemisphere's finest globular cluster M13.
 See also: Cluster, Sky, Star, Telescope, Globular Cluster
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