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Explorer 13
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<p>Explorer 13, (also called S-55A), was a <a href="/facts/NASA/TIMCV0yV">NASA</a> satellite launched as part of the <a href="/facts/Explorer_program/UAWJXqxP">Explorer program</a> on 25 August 1961, at 18:29:44 <a href="/facts/Greenwich_Mean_Time/JpSIdWsn">GMT</a>, from <a href="/facts/Wallops_Flight_Facility/F6QvD712">Wallops Flight Facility</a> (WFF), <a href="/facts/Virginia/g2kucGdn">Virginia</a>. </p>