MAY 11, 2004
M13: The Great Globular Cluster in Hercules
MAY 18, 2007
M13: The Great Globular Cluster in Hercules
NOV 15, 2007
M13: The Great Globular Cluster in Hercules
JUN 17, 2009
M13: A Great Globular Cluster of Stars
MAY 27, 2010
M13: The Great Globular Cluster in Hercules
JUN 14, 2012
M13: The Great Globular Cluster in Hercules
JUL 27, 2016
M13: A Great Globular Cluster of Stars
MAY 12, 2017
M13: The Great Globular Cluster in Hercules
JUN 13, 2019
The Colors and Magnitudes of M13