Gamma was a Sovietgamma ray telescope. It was launched on 11 July 1990 into an orbit around Earth with a height of 375 km and an inclination of 51.6 degrees. It lasted for around 2 years. On board the mission were three telescopes, all of which could be pointed at the same source. The project was a joint Soviet-French project.
The telescope was conceived in 1965, as part of the Soviet Cloud Space Station, which evolved into the Multi-module Orbital Complex (MOK). When work on Gamma finally began in 1972, it was intended to create a Gamma observatory, the first space station module for MOK, the first modular space station in the Salyut programme. For this, it was designed to add the scientific instruments of the observatory to a spacecraft derived from the Progress spacecraft – with the Progress in turn being a Soyuz spacecraft derivate – and that this spacecraft would dock to a MOK space station. However, in 1974, at the time it became a joint venture with France, the MOK space station project was canceled, and in February 1976, the Soviet space program was reconfigured. When on 16 February 1979 production of the telescope was authorized, the plans for the Soviet space station modules had evolved to use the Functional Cargo Block of the TKS spacecraft instead, with the Kvant-1 Roentgen observatory eventually becoming the first such module for Mir – as a result of these changes the Gamma observatory was redesigned as the free flying Gamma satellite. At that time the telescope was authorized in 1979, it was planned to be launched in 1984, but the actual launch was delayed until 1990.
The Disk-M telescope operated in the energy range 20 keV - 5 MeV. It consisted of Sodium iodide scintillation crystals, and had an angular resolution of 25 arcminutes. However, it stopped working shortly after the mission was launched.
Finally, the Pulsar X-2 telescope had 30 arcminute resolution and a 10 deg x 10 deg field of view, and operated in the energy range 2-25 keV.
Payloads are separated by bullets ( · ), launches by pipes ( | ). Manned flights are indicated in bold text. Uncatalogued launch failures are listed in italics. Payloads deployed from other spacecraft are denoted in (brackets).