グスタフ・キルヒホフ
The AOP was managed by a board of directors comprising Wilhelm Julius Foerster, Gustav Kirchhoff and Arthur Auwers. In 1882 Carl Hermann Vogel was appointed as sole director of the observatory. The main focus of his work was now on stellar astrophysics. He was the first successfully to determine radial velocities of stars photographically and as a result he discovered the spectroscopic binaries.