The Chalet / Vortex ELINT satellites were the successors to the Canyon series of near GEO ELINT/SIGINT satellites. Reportedly they consist of a large (ca. 38 m diameter) antenna and are three axis stabilized. The purpose of the Chalet / Vortex series is, to pinpoint radar locations. For that purpose they are deployed into a 24 h orbit, which is not geostationary, so that triangulations can be made from different points.
The name was changed from Chalet to Vortex, when the former name was disclosed in a New York Times report. They are also known as AFP-366 series. The successor of these satellites were the Mercury geostationary ELINTS.
|Type / Application:||ELINT|
|Configuration:||~ 38 m Ø Dish Antenna, 3-Axis-Stabilization|
|Mass:||932 kg ?|
|Orbit:||30200 km × 40800 km, 7.00° (typical)|
|Chalet 1 → Vortex 1 (OPS 9454)||10.06.1978||CC LC-40||Titan-3(23)C|
|Chalet 2 → Vortex 2 (OPS 1948)||01.10.1979||CC LC-40||Titan-3(23)C|
|Chalet 3 → Vortex 3 (OPS 4029)||31.10.1981||CC LC-40||Titan-3(23)C|
|Chalet 4 → Vortex 4 (OPS 0441)||31.01.1984||CC LC-40||Titan-34D Transtage|
|Chalet 5 → Vortex 5 (USA 31)||02.09.1988||CC LC-40||f||Titan-34D Transtage|
|Chalet 6 → Vortex 6 (USA 37)||10.05.1989||CC LC-40||Titan-34D Transtage|