NASA Logo, National Aeronautics and Space Administration
NASA Space Science Data Coordinated Archive Header




Explorer 24 (Air Density experiment B, or AD-B) was placed in orbit together with Explorer 25 from a single launch vehicle. This was NASA's first dual-satellite launch. Explorer 24 was identical in configuration to the previously launched balloon satellites Explorer 9 and 19. The spacecraft was 3.6 m in diameter, was built of alternating layers of aluminum foil and plastic film, and was covered uniformly with 5.1-cm white dots for thermal control. It was designed to yield atmospheric density near perigee as a function of space and time from sequential observations of the sphere's position in orbit. To facilitate ground tracking, the satellite carried a 136-MHz tracking beacon. The satellite reentered the Earth's atmosphere on October 18, 1968.

Alternate Names

  • 00931
  • Air Density experiment B
  • Explorer 24

Facts in Brief

Launch Date: 1964-11-21
Launch Vehicle: Scout
Launch Site: Vandenberg AFB, United States
Mass: 8.6 kg

Funding Agency

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


  • Earth Science

Additional Information

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



NameRoleOriginal AffiliationE-mail
Dr. Robert F. FellowsProject ScientistNASA Headquarters
Mr. Claude W. Coffee, Jr.Project ManagerNASA Langley Research Center
Dr. Gerald M. KeatingGeneral ContactNASA Langley Research Center
[] NASA Logo -