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Explorer 49

Spacecraft
Explorer 49 was a NASA 328 kg satellite launched on 10 June 1973, for long wave radio astronomy research. It had four 230 m X-shaped antenna elements, which made it one of the largest spacecraft ever built. Wikipedia
Launch date: June 10, 1973
Last contact: August 1977
Launch mass: 330.2 kg
Mission duration: 4 years and 2 months (achieved)
Spacecraft: Explorer XLIX