This page no longer updated from 31 October 2001. Latest version can be found at ATS-5

Other Designations: Applications Technology Satellite. Class: Technology. Type: Communications. Nation: United States. Agency: NASA, NSF. Manufacturer: Hughes.

The experimental goals of ATS-5 included a demonstration using L-band signals to precisely locate ships, tests of an electric ion engine, evaluation of the attenuation effects on RF signals by rain, and C-band communications tests. However, following the firing of the satellite's apogee kick motor, ATS-5 went into an unplanned flat spin. The vehicle recovered and began spinning about the correct axis, but in the direction opposite that planned. As a result, the spacecraft's gravity gradient booms could not be deployed, and some experiments were not functional. The spacecraft was able to perform some of its experimental goals, and was finally boosted above geostationary orbit at the end of its mission. Spacecraft: Aluminum structure, drum mounted solar cells provided 150 W BOL, 2 6 Ah NiCd batteries, N2 and N2H4 thrusters, yo-yo despin, nutation control, solar arrays cooled by heat pipes. Planned as gravity gradient stabilised. Payload: Magnetometer, ion engine (10E-5 lbf resistojet), C-band communications package, millimetre wave propagation experiment, L-band communications experiment.


Design Life: 3 years. Total Length: 1.8 m. Maximum Diameter: 1.4 m. Total Mass: 821 kg.

ATS-5 Chronology

12 August 1969 ATS 5 Program: ATS. Launch Site: Cape Canaveral . Launch Vehicle: Atlas Centaur SLV-3C. Mass: 821 kg. Perigee: 35,981 km. Apogee: 36,035 km. Inclination: 14.3 deg.

Applications Technology Satellite; communications tests. Launch vehicle put payload into geosynchronous transfer orbit. Spacecraft maneuvered into geostationary orbit at 108 degrees W. Also tested ion engine.


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Last update 12 March 2001.
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© Mark Wade, 2001 .