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Hercules Cluster

M13, globular cluster in Hercules, taken with Celestron C6-N, 20mm. eyepiece, ISO200, 15" of exposure and 3x optical zoom.

 

ENGLISH

Third astrophotographic session. Not yet I dominate the focus, and the sky was very luminous because the artificial illumination and an almost full moon.

 

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The Great Globular Cluster in Hercules (also known as the Hercules Globular Cluster, Messier Object 13, Messier 13, M13, or NGC 6205) is a globular cluster in the Hercules constellation at right ascension 16h 41.7m and declination +36° 28'.

 

It was discovered by Edmond Halley in 1714, and catalogued by Charles Messier on June 1, 1764.

 

With an apparent magnitude of 5.8, it is barely visible with the naked eye on a very clear night. Its real diameter is about 145 light-years, and is composed of several hundred thousand stars, the brightest of which is the variable star V11 with an apparent magnitude of 11.95. M13 is 25,100 light-years away from Earth.

 

Its diameter is about 23 arc minutes and is readily viewable in small telescopes. Nearby is NGC 6207, a 12th magnitude edge on galaxy that lies 28 arc minutes directly north east. The J2000 coordinates are RA: 16h 41m 41.5s and Dec: +36° 27' 37".

 

The Arecibo message of 1974 was transmitted toward this globular cluster.

 

More info: en.wikipedia.org/wiki/Messier_13

 

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CASTELLANO

Tercera sesión astrofotográfica. Aún no domino el enfoque, y el cielo estaba demasiado luminoso por la contaminación lumínica de las farolas y por una luna casi llena.

 

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El Cúmulo de Hércules (también conocido como Gran Cúmulo de Hércules, Objeto Messier 13, Messier 13, M13 o NGC 6205) es un cúmulo globular de la constelación de Hercules. Fue descubierto por el astrónomo inglés Edmond Halley en el año 1714. William Herschel, por medio de su gran telescopio reflector, pudo descubrir varias alineaciones de estrellas (conocidas como patas de araña), comprobar que estaba formado por estrellas y hacer un primer recuento de sus componentes (aproximadamente unas 8.500 según sus cómputos)

 

Más info: es.wikipedia.org/wiki/C%c3%bamulo_de_H%c3%a9rcules

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Uploaded on June 4, 2007
Taken on June 3, 2007