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Here are details about a : Space commemorative cover or Space Cover.
Cosmodrom : USA
Date of Cancellation: Dec. 15, 1980 Kind of Event : Launch Launch pad : USA Vandenberg
habité?/manned?: robot Mission type : Military
ou?/where?: au sol - ground
autographe?: non - none
Description : Can be SDS, Quasar ou Jumpseat spy satellite. Satellite Data System (SDS) spacecraft are communication relay satellites for transmiting real-time data from US reconnaissance satellites (KH-11) in polar area. They are also used for communications to USAF air craft on polar routes and connect the various ground stations of the Air Force Satellite Control Network (AFSCN). The spacecraft relay the downlinked KH-11 data to a ground station at Fort Belvoir, Virginia. Vandenberg post stamp and Comsat Relay satellite.