The Captain Hook Cluster (NGC 6633), located toward the upper right of this image, is an open cluster that shines at magnitude 4.6 and measures 27' across. You’ll find it 8° west-northwest of Alya (Theta [θ] Serpentis). Keep the magnification low through large scopes so you don’t look “through” this cluster. Open cluster IC 4756 in Serpens is also visible at left here.