M13, a globular star cluster in the Constellation Hercules. One of the most prominent known globular clusters of the Northern Celestial Hemisphere. At a distance of ~25,100 light years, its visual angular diameter of 20' corresponds to a actual linear diameter of ~145 light years. It contains several 100,000 stars and is believed to be over 12 billion years old.

Taken 2006.06.24/25
Birmingham, Ohio USA
Meade LX200GPS 8"
Canon 10D
Processed with ImagesPlus 2.75

Monitor Calibration and Adjustment
Use the strip below to adjust the Brightness and Contrast of your monitor.
You should see Black on the Left shading in blocks to White on the Right.

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All content copyright D. Gulyas 1998-2007. Use without permission prohibited.
Updated: 2006.06.27 18:08