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First flight
First orbit: Explorer 1 satellite
ceased transmission of data due to dead batteries, but remained in orbit for 12 years.
6 launches over time
3 successful
3 unsuccessful
Reentry over the Pacific ocean on March 30, 1970 -
Attempted orbit Explorer 2 satellite
Failed because the fourth stage did not ignite -
Explorer 3 satellite orbited
Down June 28, 1958 -
Explorer 4 satellite orbited
Down October 23,1959 -
Attempted orbit Explorer 5 satellite
It failed after booster collided with second stage after separation, causing upper stage firing angle to be off. -
Attempted orbit of 12 ft inflatable Beacon satellite
Failed when second stage separated preternaturally from booster