M13 was discovered by Edmond Halley in 1714, and catalogued by Charles Messier on June 1, 1764.
It is a globular cluster of aprox. 300.000 stars in the constellation Hercules at 25.100 light-years away from Earth.
M13 is about 145 light-years in diameter, the brightest star is the variable star V11 with an apparent magnitude of 11.95.
Here is my first try at M13 taken from the city:
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