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The goal of the Total Ozone Mapping Spectrometer (TOMS) Earth Probe mission (part of NASA's Mission To Planet Earth (MTPE) Phase I program) was to continue the high-resolution global mapping of total ozone on a daily basis (begun with the Nimbus 7 SBUV/TOMS) as well as to detect global ozone trends to verify depletion predicted by atmospheric chemistry models.

The TOMS-Earth Probe (TOMS-EP), the first of a series of NASA Earth Probe missions, was one of three TOMS missions which included METEOR 3/TOMS2 (launched 1991) and ADEOS/TOMS (launched 1995). The TOMS-EP carried only one instrument: the Total Ozone Mapping Spectrometer (TOMS).

The TOMS-EP spacecraft was based on the TRW/DSI Eagle bus developed under the USAF STEP program. The spacecraft was three-axis stabilized so that the TOMS instrument was nadir-pointed with about 0.5 degree control and about 0.1 degree knowledge from measured altitude data. The TOMS-EP spacecraft bus was designed to accomodate all of the TOMS instrument requirements to support a two-year lifetime with a three-year lifetime goal.

Alternate Names

  • 23940
  • SMEX/TOMS-Earth Probe
  • Small Explorer/TOMS-Earth Probe
  • TOMS-EP96
  • TOMS-Earth Probe

Facts in Brief

Launch Date: 1996-07-02
Launch Vehicle: Pegasus XL
Launch Site: Vandenberg AFB, United States
Mass: 248 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
Mr. Donald L. MargoliesProject ManagerNASA Goddard Space Flight
Dr. Robert Douglas HudsonProject ScientistNASA Goddard Space Flight Center
Dr. George F. Esenwein, Jr.Program ManagerNASA Headquarters
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