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IMP-H continued the study begun by earlier IMP spacecraft of the interplanetary and magnetotail regions from a nearly circular orbit, near 37 earth radii. This 16-sided drum-shaped spacecraft was 157 cm high and 135 cm in diameter. It was designed to measure energetic particles, plasma, and electric and magnetic fields. The spin axis was normal to the ecliptic plane, and the spin period was 1.3 s. The spacecraft was powered by solar cells and a chemical battery. Scientific data were telemetered at 1600 bps (with a secondary 400-bps rate available). The spacecraft was turned off on October 31, 1978.

Alternate Names

  • Explorer 47
  • IMP 7
  • 06197

Facts in Brief

Launch Date: 1972-09-23
Launch Vehicle: Delta
Launch Site: Cape Canaveral, United States
Mass: 390.0 kg

Funding Agency

  • NASA-Office of Space Science Applications (United States)


  • Solar Physics
  • Space Physics

Additional Information

Questions or comments about this spacecraft can be directed to: Coordinated Request and User Support Office.



NameRoleOriginal AffiliationE-mail
Dr. James H. TrainorGeneral ContactNASA Goddard Space Flight Center 
Dr. Norman F. NessProject ScientistNASA Goddard Space Flight
Mr. John R. HoltzProgram ManagerNASA Headquarters 
Dr. Joseph H. KingProject ScientistNASA Goddard Space Flight
Dr. Erwin R. SchmerlingProgram ScientistNASA Headquarters 
Mr. William R. LimberisProject ManagerNASA Goddard Space Flight Center 

Other IMP 7 Data/Information at NSSDCA

Retrieve/browse OMNI (hourly solar wind field/plasma) data with OMNIWeb

Related Data/Information at NSSDCA

Information on other IMP spacecraft
Information on other Explorer spacecraft

Other Sources of IMP 7 Data/Information

Daily LEPEDEA (IMP 7 and IMP 8) spectrograms at U. Iowa

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