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Successful Launches
Explorer 1
https://en.wikipedia.org/wiki/Explorer_1 -
Unsuccessful Launches
Attempted orbit of Explorer 2. Failed because fourth stage did not ignite .
https://en.wikipedia.org/wiki/Explorer_2 -
Successful Launches
Explorer 3
https://en.wikipedia.org/wiki/Explorer_3 -
Successful Launches
Explorer 4
https://en.wikipedia.org/wiki/Explorer_4 -
Unsuccessful Launch
Explorer 5 . It failed after booster collided with second stage after separation, causing upper stage firing angle to be off .
https://en.wikipedia.org/wiki/Explorer_5 -
Unsuccessful Launch
Attempted orbit of 12 ft inflatable Beacon satellite (of Project Echo) . It failed when second stage separated prematurely from booster
https://en.wikipedia.org/wiki/Juno_I