Salyut 6

Salyut 6 (Russian: Салют-6; lit. Salute 6), DOS-5, was a Soviet orbital space station, the eighth flown as part of the Salyut programme. Launched on 29 September 1977 by a Proton rocket, the station was the first of the 'second-generation' type of space station. Salyut 6 possessed several revolutionary advances over the earlier Soviet space stations, which it nevertheless resembled in overall design. These included the addition of a second docking port, a new main propulsion system and the station's primary scientific instrument, the BST-1M multispectral telescope. The addition of the second docking port made crew handovers and station resupply by unmanned Progress freighters possible for the first time. The early Salyut stations had no means of resupply or removing accumulated garbage (aside from the limited amount that cosmonauts could carry in their Soyuz spacecraft), nor could the propulsion system be refueled once it exhausted its propellant supply. Consequently, once the consumables launched with the station were used up, its mission had to be concluded and as a result, manned missions had a maximum duration of three months. Progress spacecraft could now bring fresh supplies and propellant and also be used to dispose of waste, which was then destroyed once the spacecraft was deorbited.

Salyut programme

The Salyut programme (Russian: Салю́т, IPA: [sɐˈlʲut], Salute or Fireworks) was the first space station programme undertaken by the Soviet Union, which consisted of a series of four crewed scientific research space stations and two crewed military reconnaissance space stations over a period of 15 years from 1971 to 1986. Two other Salyut launches failed. Salyut was, on the one hand, designed to carry out long-term research into the problems of living in space and a variety of astronomical, biological and Earth-resources experiments, and on the other hand this civilian program was used as a cover for the highly secretive military Almaz stations, which flew under the Salyut designation. Salyut 1, the first station in the program, became the world's first crewed space station.

Salyut broke several spaceflight records, including several mission duration records, the first ever orbital handover of a space station from one crew to another, and various spacewalk records. The Soyuz program was vital for evolving space station technology from basic, engineering development stage, single-docking port stations to complex, multi-ported long-term orbital outposts with impressive scientific capabilities, whose technological legacy continues to the present day. Ultimately, experience gained from the Salyut stations went on to pave the way for multimodular space stations such as Mir and the International Space Station, with each of those stations possessing a Salyut-derived core module at its heart.

Salyut 5

Salyut 5 (Russian: Салют-5 meaning Salute 5), also known as OPS-3, was a Soviet space station. Launched in 1976 as part of the Salyut programme, it was the third and last Almaz space station to be launched for the Soviet military. Two Soyuz missions visited the station, each manned by two cosmonauts. A third Soyuz mission attempted to visit the station, but failed to dock, whilst a fourth mission was planned but never launched.

Launch

Salyut 5 was launched at 18:04:00 UTC on 22 June 1976. The launch took place from Site 81/23 the Baikonur Cosmodrome in the Kazakh Soviet Socialist Republic, and used a three-stage Proton-K 8K82K carrier rocket with the serial number 290-02.

Upon reaching orbit, Salyut 5 was assigned the International Designator 1976-057A, whilst the North American Aerospace Defense Command gave it the Satellite Catalog Number 08911.

Spacecraft

Salyut 5 was an Almaz spacecraft, the last of three to be launched as space stations after Salyut 2 and Salyut 3. Like its predecessors, it was 14.55 metres (47.7 ft) long, with a maximum diameter of 4.15 metres (13.6 ft). It had a habitable interior volume of 100 cubic metres (3,500 cu ft), and a mass at launch of 19,000 kilograms (42,000 lb). The station was equipped with a single docking port for Soyuz spacecraft, with the Soyuz 7K-T being the configuration in service at the time. Two solar arrays mounted laterally at the same end of the station as the docking port provided it with power. The station was equipped with a KSI capsule to return research data and materials.

Salyut 1

Salyut 1 (DOS-1) (Russian: Салют-1; English translation: Salute 1) was the first space station of any kind, launched by the Soviet Union on April 19, 1971. More stations followed in the Salyut program, and heritage of that space station program is still in use on the ISS.

Salyut 1 originated as a modification of the military Almaz space station program then in development. After the landing of Apollo 11 on the Moon in July 1969, the Soviets began shifting the primary emphasis of their manned space program to orbiting space stations, with a possible lunar landing later in the 1970s if the N-1 booster became flight-worthy (which it didn't). One other motivation for the space station program was a desire to one-up the US Skylab program then in development. The basic structure of Salyut 1 was adapted from the Almaz with a few modifications and would form the basis of all Soviet space stations through Mir.

Civilian Soviet space stations were internally referred to as "DOS" stations, although publicly, the Salyut name was used for all Almaz and DOS stations. Several military experiments were nonetheless carried on Salyut 1, including the OD-4 optical visual ranger, the Orion ultraviolet instrument for characterizing rocket exhaust plumes, and the highly classified Svinets radiometer.