Messier 13 - The Hercules Cluster
The globular cluster Messier 13 in Hercules. This cluster of stars lies about 25,100 light-years from Earth and is about 145 light-years in diameter. It contains approximately 100,000 stars.

More information about Messier 13 can be found here.

This image is a stacked set of six 30-second images captured using a 10-inch Newtonian telescope with 2x Barlow lens coupled to a Canon 350D camera.

   
A wider field image of Messier 13 without the Barlow lens in place.

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Wide field image of the area around Messier 13.

To view this image in Google Maps click here.

This is a stacked set of about 6 30-second images captured using 10-inch Newtonian telescope coupled to a Canon 350D camera.

   
An image of the cluster showing the location of the galaxy NGC 6207. The galaxy is far more distant than the cluster. More information about NGC 6207 can be found here.

A version of this image with grid coordinates superimposed can be found here.

   
   
   
Another image of the area around Messier 13 in Hercules using film instead of a digital camera.

This is a 20 minute exposure through a 10-inch Newtonian telescope on Fuji ISO 800 35mm color negative film.

   
This image was captured on film using an I-cubed image intensifier. The exposure time was approximately 1 second.

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