NGC 6871 is an open star cluster located in the constellation Cassiopeia. It was discovered by the astronomer William Herschel in 1788. The cluster is approximately 3,600 light-years away from Earth and contains several bright stars, making it a notable object for amateur astronomers. The cluster spans about 20 light-years across and is estimated to be around 100 million years old. NGC 6871 is part of a larger region of star formation, contributing to our understanding of stellar evolution and the dynamics of star clusters in the Milky Way galaxy.