Explorer 26 (EPE-D)

Explorer 26 was a spin-stabilized, solar-cell-powered spacecraft weighing 45.8 kilograms (101 lb). It carried five experiments: Solid-State Electron Detector, Omnidirectional and Unidirectional Electron and Proton Fluxes, Fluxgate Magnetometers, Proton-Electron Scintillation Detector, and Solar Cell Damage.