Another Open cluster to be found in the rich hunting grounds of the constellation of Scorpius is M7, also known as Ptolemy's cluster. It is a large group of about 80 stars set against the background of fainter and more distant Milky Way stars. M7 is about 18 light years in diameter and lies about 800 light years from us. The brightest star of the cluster is a yellow giant with a magnitude of 5.6. This bright cluster makes a sine target for the binocular observer