M 6 is commonly known as the Butterfly
Cluster. The astronomer Giovanni Battista Hodierma is allegedly
the first person to record this object. However, Robert Burnam suggested
that Ptolemy may have observed it while recording M 7 (the cluster
that bears his name). Charles Messier added this to his catalogue
M 6 lies 1600 light years away and
spans 12 light years. It contains approximately 80 stars. Most of
its stars are hot blue (B-type) although the brightest star in the
cluster is a K-type orange giant.
Taken from my residence in southeastern
Minnesota on 8/5/16.