Another galactic 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.