NGC 6193

An open cluster in the nebula NGC 6188, NGC 6193 formed about three million years ago from the surrounding gas, and appears unusually rich in close binary stars.

Two early O-type stars, HD 150135 and HD 150136, dominate this cluster and are the main energy sources for heating the H II region.

Some distance from the cluster is HD 148937, a peculiar Of star responsible for the emission nebula RCW 107.