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United States Air ForceLaunch SuccessfulAstrophysicsThor Delta C
Launched 1965-05-29 12:00 UTCSpace Launch Complex 17B, Cape Canaveral SFS, FL, USA
Success
Reached Elliptical Orbit
Worldwide
48th
orbital launch attempt in 1965
United States Air Force
31st
launch this year
Space Launch Complex 17B
2nd
launch from this pad this year
Pad turnaround
114 d 19 h
since the pad's previous launch
Explorer 28 (IMP 3) was a solar-cell and chemical-battery powered spacecraft instrumented for interplanetary and distant magnetospheric studies of energetic particles, cosmic rays, magnetic fields, and plasmas.

Launch Provider
Government · United States of America · Founded 1947 · Commander-in-Chief President of the US
The United States Air Force (USAF) is the air service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. Originally created on 1 August 1907, as a part of the United States Army Signal Corps, the USAF was established as a separate branch of the United States Armed Forces in 1947 with the enactment of the National Security Act of 1947.
Launches
1,078
Successful
972
90%
Upcoming
0
scheduled
Height
27.5m
Diameter
2.4m
To low Earth orbit
81kg
Liftoff thrust
667kN
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