Messier 13

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Messier Object 13, the Great Globular Cluster in Hercules; one of the most prominent and best known globular clusters of the Northern celestial hemisphere.

NGC 6205

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'. 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 165 light years, and is composed of several hundred thousand stars from magnitude 11.95 (variable star V11) to down. It 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. Literary references The science fiction novellas "Sucker Bait" by Isaac Asimov and "Question and Answer" by Poul Anderson take place on Troas, a world within M13. In the science fiction series Perry Rhodan, M13 is the location of Arkon, the home world of the race of Arkonides. See also New General Catalogue External links [Messier 13, SEDS Messier pages] [Messier 13, Image by Waid Observatory] [PHOTOMETRIC STUDY OF THE V2 CEPHEID IN M13] [Period, Amplitude and Light Curve of V38 in M13]   From Wikipedia, the Free Encyclopedia. Original article here. Support Wikipedia by contributing or donating. All text is available under the terms of the GNU Free Documentation License See Wikipedia Copyrights for details. Search Titles 0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ? E-mail this article to: Personal Message: