The star cluster NGC 6604 in the constellation of Serpens

This chart shows the location of the star cluster NGC 6604 in the constellation of Serpens (The Serpent). This map shows most of the stars visible to the unaided eye under good conditions and the location of the cluster itself is marked with a red circle. Although the star cluster itself is easily seen in a small telescope, the nebula is very faint and was only discovered photographically in the mid 20th century.