Kvant-1

First addition to the Mir core module, docked to the aft end of the station. This provided the station with a complex set of scientific equipment (the international Roentgen X-ray Observatory consisting of the HEXE, Pulsar X-1, Sirene-2, and TTM instruments; the Glasar UV telescope; and the Svetlana electrophoresis unit) as well as additional support systems, in particular attitude control from 6 large gyrodynes. The module was launched with a TKM-E space tug, which maneuvered the spacecraft through docking and was then discarded.