Hercules Cluster (M13)

Globulars or Open, clusters of stars can be neat viewing.
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Christopher K.
Posts: 4763
Joined: October 12th, 2009, 3:28 pm
Location: Baton Rouge, LA

Hercules Cluster (M13)

Post by Christopher K. » August 9th, 2013, 11:41 pm

"A most beautiful cluster of stars exceedingly compressed in the middle and very rich" is how William Herschel described the Hercules Cluster when he saw it through a reflector. Florence Grondal called it "a treasure trove of 50,000 stars".

Below are the times during which M13 is highest in the Baton Rouge sky (almost eighty-four degrees)...
April 21 = 3:48am CDT
April 25 = 3:32am CDT
April 29 = 3:17am CDT
May 3 = 3:01am CDT
May 7 = 2:45am CDT
May 11 = 2:29am CDT
May 15 = 2:14am CDT
May 19 = 1:58am CDT
May 23 = 1:42am CDT
May 27 = 1:27am CDT
May 31 = 1:11am CDT
June 4 = 12:55am CDT
June 8 = 12:39am CDT
June 12 = 12:24am CDT
June 16 = 12:08am CDT
June 20 = 11:48pm CDT
June 24 = 11:33pm CDT
June 28 = 11:17pm CDT
July 2 = 11:01pm CDT
July 6 = 10:45pm CDT
July 10 = 10:30pm CDT
July 14 = 10:14pm CDT
July 18 = 9:58pm CDT
July 22 = 9:42pm CDT
July 26 = 9:27pm CDT
July 30 = 9:11pm CDT
August 3 = 8:55pm CDT

More information:
Celestial Handbook by Robert Burnham, pp. 978-987
http://www.daviddarling.info/encycloped ... uster.html

Evelyn Petkow of Munich sent the Astronomy staff an M13 sketch as an anniversary present; it's featured on page 11 of the August issue.

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