NGC 6819 is an open star cluster located in the constellation Cygnus. It is approximately 3,700 light-years away from Earth and is estimated to be around 2.5 billion years old. The cluster contains several hundred stars, many of which are similar in age and composition. This star cluster is notable for its relatively high concentration of stars, making it a popular target for astronomers. NGC 6819 is often studied to understand stellar evolution and the dynamics of star clusters in our galaxy, the Milky Way.