Caption:: Located in the constellation Herculues, M13 is the largest and brightest globular cluster in the northern sky, third in the whole sky, after the Omega Centaurus and 47 Tucanae.

• 位于武仙座的球状星团M13，是北天球最大最亮的球状星团，在全天排行第三，仅次于南天球的半人马座奥米加星团，杜鹃座47。