|astronautix.com||Chronology - 1975 - Quarter 1|
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As the only remaining contender for the Aelita design competition, Chelomei proposes a Mars flyby using an MK-700 spacecraft. A crew of two would be sent on a two year mission in a single launch of a UR-700M booster. The spacecraft would have a mass of 250 tonnes in low earth orbit and be equipped with an RD-410 nuclear engine. References: 73 .
NASA realized that after the completion of the Apollo, Skylab, and ASTP programs there would still be significant Apollo surplus hardware. This amounted to two Saturn V and three Saturn IB boosters; one Skylab space station, three Apollo CSM's and two Lunar Modules. After many iterations NASA considered use of these assets for a second Skylab station in May 1973. A range of options were considered. Saturn V SA-515 would boost the backup Skylab station into orbit somewhere between January 1975 and April 1976. It would serve as a space station for Apollo and Soyuz spacecraft in the context of the Apollo ASTP mission. The Advanced or International Skylab variants proposed use of Saturn V SA-514 to launch a second workshop module and international payloads. This station would be serviced first by Apollo and Soyuz, then by the space shuttle. Using the existing hardware, these options would cost anywhere from $ 220 to $ 650 million. But funds were not forthcoming. The decision was taken to mothball surplus hardware in August 1973. In December 1976, the boosters and spacecraft were handed over to museums. The opportunity to launch an International Space Station, at a tenth of the cost and twenty years earlier, was lost. References: 129 .
The USNS Sunnyvale, the last Air Force Western Test Range instrumentation ship, transferred to the Maritime Administration. References: 88 .
Start long-lead fabrication aft fuselage (STA-099) References: 15 .
Manned two crew. Docked with Salyut 4. Joint experiments with the Salyut scientific orbital station. Recovered February 9, 1975 11:03 GMT. Landed 110 km NE Tselinograd. References: 1 , 2 , 6 , 32 , 33 , 60 .
Planned date of fifth manned MOL mission. This mission was already deleted from the FY 1970 budget request in April 1969, two months before the entire project was cancelled. References: 128 .
Decay date suspect Operation of the long-range telephone and telegraph radiocommunications system in the USSR; transmission of television programmes to stations in the Orbita network. References: 1 , 2 , 5 , 6 .
Examined solar radiation, thermospheric structure. SRATS (Solar and Thermospheric Radiation Satellite) is the third Japanese scientific satellite, to study the intereffects of solar radiation and the thermosphere of the earth. National name: Taiyo. Launch time 0525 GMT. References: 1 , 2 , 5 , 6 .
The third and final Mercury encounter yielded primarily fields and particles data.
The vehicle was turned off after its onboard fuel was depleted.
Upper atmospheric experiments. Study of dynamic processes in the earth's magnetosphere and polar ionosphere and investigation of low-frequency electromagnetic waves. References: 1 , 2 , 5 , 6 , 99 , 116 .
Start long-lead fabrication aft fuselage, Columbia (OV-102) References: 15 .
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