ISIS 1 (International Satellite for Ionosphere Studies) was an ionospheric observatory instrumented with sweep- and fixed-frequency ionosondes, a VLF receiver, energetic and soft particle detectors, an ion mass spectrometer, an electrostatic probe, an electrostatic analyzer, a beacon transmitter, and a cosmic noise experiment.
Elliptical OrbitUS-A (Upravlenniye Sputnik Aktivny) were active radar satellites for ocean surveillance. The high power consumtion of the active radar required a nuclear reactor as power source. The satellites were known as RORSAT in the west. The US-AO series consisted of satellites, which tested all the system components but the nuclear reactor. They were battery powered.
Low Earth OrbitSoyuz 5 mission started with the launch on January 15, 1969, 07:04:57 UTC, carrying Commander Boris Volynov, Flight Engineer Vladislav Volkov and Research Engineer Pyotr Kolodin into orbit. Two days later mission achieved the first ever docking of two crewed spacecrafts, having Soyuz 5 docked with Soyuz 4 spacecraft. Since no connecting tunel had been developed yet, the two cosmonauts had to spacewalk from one vehicle to another. The mission concluded with a hard landing back on Earth on January 18, 1969, 07:59:12 UTC.
Low Earth OrbitSoyuz 4 mission started with the launch on January 14, 1969, 07:30:00 UTC, carrying Commander Vladimir Shatalov, Flight Engineer Aleksei Yeliseyev and Research Engineer Yevgeny Khrunov into orbit. Two days later mission achieved the first ever docking of two crewed spacecrafts, having Soyuz 4 docked with Soyuz 5 spacecraft. Since no connecting tunel had been developed yet, the two cosmonauts had to spacewalk from one vehicle to another. The mission concluded with a safe landing back on Earth on January 17, 1969, 06:50:47 UTC.
Low Earth Orbit