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




This satellite carried eight complementary types of experiments, designed to study atmospheric density and its changes at low altitudes. The satellite was spin stabilized, with the spin axis perpendicular to its polar orbit. Orbit precession, when the orbit is inclined more than 70 deg, was limited to less than 0.5 deg per day. This limited observations for sampling to less than one-fourth of the possible 25 h of local time over the 7-month satellite lifetime.

Alternate Names

  • 07499
  • SESP P73-5
  • ST73-5A

Facts in Brief

Launch Date: 1974-10-29
Launch Vehicle: Titan III-D
Launch Site: Vandenberg AFB, United States

Funding Agency

  • Department of Defense-Department of the Air Force (United States)


  • Space Physics
  • Solar Physics
  • Earth Science

Additional Information

Questions and comments about this spacecraft can be directed to: Dr. Dieter K. Bilitza



NameRoleOriginal AffiliationE-mail
Dr. John R. StevensProject ScientistAerospace Corporation
[] NASA Logo -