Messier M13
Great Hercules Cluster
Globular Cluster
Hercules
Easy
Brightest globular in the northern sky; resolves into stars at moderate apertures.
Angular size
20′
Magnitude
5.8
Best months
May-Aug
Constellation
Hercules
Catalog IDs
M13;NGC 6205
Common aliases
Hercules Globular Cluster;Great Globular Cluster in Hercules