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    DME (Direct Measurement Explorer)

    DME (Explorer 31)
    Also known as Explorer 31; it was launched together with the Canadian Alouette 2. The double-launch project, known as ISIS-X, was the first in a new cooperative NASA-Canadian Defense Research Board program for International Satellites for Ionospheric Studies. DME was placed in an orbit with an apogee (highest point) slightly higher than Alouette's and a perigee (lowest point) slightly lower. Eight ionospheric experiments sampled the environment both ahead and behind the satellite.


    launch date Nov. 28, 1965
    launch vehicle Thor-Agena B
    launch site Vandenberg Air Force Base
    orbit 502 × 2,857 km × 79.8°
    mass 99 kg


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