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Dimensions3000 x 3025
Original file size2.47 MB
Image typeJPEG
M13 in Hercules

M13 in Hercules

SBIG ST-4000XCM
27x300sec
Darks/Flats/Bias Applied
Imager Temp -20C
Celestron 9.25 Reduced 0.63
20% Crop

Astronomy Magazine Picture of the Day July 28, 2009

Small Wonders: Hercules June, 2009 (Tom Trusock)

Anacortes Telescope and Wild Bird Picture of the Day May 18, 2009

M13 (NGC 6205) is a globular cluster in the constellation of Hercules. M13 is about 145 light-years in diameter, and it 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.

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

The Arecibo message of 1974, designed to communicate the existence of human life to hypothetical extraterrestrials, was transmitted toward M13. The reason was that with a higher star density, the chances of a life harboring planet with intelligent life forms, were higher.

The "Merceds Benz sign", a collection of known star-poor areas can be seen as an inverted "Y" in the left lower part of the core in this image.

May 11, 2009