Juno I

American IRBM-derived small-lift orbital rocket

A Jupiter-C fitted with a fourth solid-fuel stage, Juno I launched Explorer 1 on 31 January 1958 — the first US satellite, and the one that discovered the Van Allen radiation belts. Six launches in 1958; only three reached orbit, but the first was enough to matter.

launches: 6
success · 3/6: 50%

Full Launch History


Oct 23, 195803:21:00 UTCFailure	Beacon satellite USA•Juno I	-	Juno I	Failure
Aug 24, 195806:17:00 UTCFailure	Explorer 5 USA•Juno I	-	Juno I	Failure
Jul 26, 195815:00:00 UTC	Explorer 4 USA•Juno I	-	Juno I	Success
Mar 26, 195817:38:00 UTC	Explorer 3 USA•Juno I	-	Juno I	Success
Mar 5, 195818:27:00 UTCFailure	Explorer 2 USA•Juno I	-	Juno I	Failure
Feb 1, 195803:47:00 UTC	Explorer 1 USA•Juno I	-	Juno I	Success