Messier 13, the Hercules Cluster   HOME INDEX BACK NEXT

Globular Cluster in Hercules 

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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. 

Magnitude 5.8
Apparent Size 20'
Distance (light yrs) 22,000
Right Ascension 16:41.7
Declination +36 28
Field of View 28' x 21'

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.

June 2016