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Explorer 18
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<p>Explorer 18, also called IMP-A, IMP-1, Interplanetary Monitoring Platform-1 and S-74, was a <a href="/facts/NASA/TIMCV0yV">NASA</a> satellite launched as part of the <a href="/facts/Explorer_program/UAWJXqxP">Explorer program</a>. Explorer 18 was launched on 27 November 1963 from <a href="/facts/Cape_Canaveral_Space_Force_Station/dwJ9MCPH">Cape Canaveral Air Force Station</a> (CCAFS), <a href="/facts/Florida/cF245A3Q">Florida</a>, with a <a href="/facts/Delta_(rocket_family)/gQH4EUYB">Thor-Delta C</a> <a href="/facts/Launch_vehicle/g1GCGFJB">launch vehicle</a>. Explorer 18 was the first satellite of the <a href="/facts/Interplanetary_Monitoring_Platform/j1UkG4XX">Interplanetary Monitoring Platform</a> (IMP). <a href="/facts/Explorer_21/X24WxGVd">Explorer 21</a> (IMP-B) launched in October 1964 and <a href="/facts/Explorer_28/BlAwqMQK">Explorer 28</a> (IMP-C) launched in May 1965 also used the same general spacecraft design. </p>