M 13

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Description: Discovered by Halley in 1714, this globular cluster contains about 600,000 solar masses and is about 13 billion years old. It orbits our Galaxy, taking about one half billion years to make one revolution. The faint galaxy at the upper left is NGC 6207, which is 55 million light years distant.
Constellation: Hercules
Distance: 25 thousand light years
Apparent Size: 17'
Date: 11 may 2005
Equipment: FSQ-106 @ f/5, ST2000XM, MI-250
Exposure: RGB: 12-12-9 minutes
Comments: The subexposures for this image were unguided for 3 minutes each.