The Mir Docking Module, formally known as the Stykovochnyy Otsek , was the sixth module of the Russian space station Mir, launched in November 1995 aboard the Space Shuttle Atlantis. The module, built by Energia, was designed to help simplify space shuttle dockings to Mir during the Shuttle-Mir program, preventing the need for the periodic relocation of the Kristall module necessary for dockings prior to the compartment's arrival. The module was also used to transport two new photovoltaic arrays to the station, as a mounting point for external experiments, and as a storage module when not in use for dockings.