Globular Cluster in Hercules
A favorite target at any summer star
party or public observing session is Messier 13. This is one of the brightest globular
clusters visible from the northern hemisphere, a dense ball of about 500,000
stars. The cluster can be just
glimpsed with the naked eye from dark skies, and it is easy to see with
binoculars as a small fuzzy patch. It is a great sight in telescopes of medium to large aperture.
Image details: Exposure times of 63 minutes luminance and 24 minutes each of red, green and blue, taken with an SBIG ST-8300M imager and a 14" Meade LX850 telescope at f/6.