Solar Panels, For Satellite, IMP-E, Test Unit


Display Status:

This object is not on display at the National Air and Space Museum. It is either on loan or in storage.

Collection Item Summary:

This artifact is an engineering test model for the Interplanetary Monitoring Platform E, also known as IMP-E and Explorer 35. This spacecraft, built by Westinghouse, was designed to provide data on the solar wind, magnetic fields and radiation near the moon. The flight model was placed into orbit on July 19, 1967, aboard a Delta vehicle. This engineering model was refurbished at NASA's Goddard Space Flight Center and then transferred to NASM in May 1976.

Collection Item Long Description:

Inventory Number


Credit Line

Transferred from the National Aeronautics and Space Administration


Country of Origin

United States of America


Mixed metals, solar cells, electronics


  • Overall (with solar panels): 7 ft. long x 7 ft. wide x 3 ft. tall (213.36 x 213.36 x 91.44cm) 230 lb.
  • Other:
  • Bus diameter: 2 ft. 4 in. wide (71.1cm)
  • Solar panels with hardware: 20 in. wide x 23 2/3 in. long
  • Sensor arm (unfolded): 5 ft., 6 3/4 in. long

Data Source

National Air and Space Museum

Restrictions & Rights

Do not reproduce without permission from the Smithsonian Institution, National Air and Space Museum