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Template:Correct title Template:Infobox spaceflight Explorer-1 [Prime], also known as E1P and Electra,[1] was a CubeSat-class picosatellite built by the Space Science and Engineering Laboratory (SSEL)[2] at Montana State University. It was launched aboard a Taurus-XL rocket from Vandenberg Air Force Base, California on 4 March 2011,[3] but failed to achieve orbit after the rocket malfunctioned.

As part of NASA's ELaNA[4] program, E1P was to be launched along with NASA's Glory satellite,[5] Kentucky Space's KySat-1 and the University of Colorado-Boulder's Hermes CubeSats.[6]

E1P was a reflight mission of Explorer 1, the first American satellite, using modern technology including a geiger tube donated by James Van Allen. The name of the satellite was also adopted from Van Allen, who referred to the satellite as Explorer-1 Prime prior to his death in 2006.

It was originally intended to be launched in 2008 to commemorate the 50th anniversary of the launch of Explorer 1. If it had been successful, E1P would have been Montana's first successful launch of a satellite after the loss of SSEL's MEROPE[7] in 2006.[1]

There was a spare, Explorer-1 Prime Unit 2,[8] that was launched with NPP.[9]

The Michigan Exploration Laboratory (MXL) suspects that the M-Cubed CubeSat, a joint project run by MXL and JPL, became magnetically conjoined to Explorer-1 Prime, a second CubeSat released at the same time, via strong onboard magnets used for passive attitude control (see: Magnetorquer), after deploying on October 28, 2011. This is the first non-destructive latching of two satellites.

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