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Total Ozone Mapping Satellite


Designation 23940 / 96037A
Launch date 2 Jul 1996
Country of origin United States
Mission Remote sensing
Perigee/Apogee 500 km (sunsynchronous)
Inclination 97.4°
Period 96.7 min
Launch vehicle Pegasus XL #12

TOMS will focus on tropospheric ozone, to monitor its depletion. It measures total ozone by observing both incoming solar energy and backscattered ultraviolet radiation at six wavelengths. Backscattered radiation is solar radiation that has penetrated the Earth's lower atmosphere and been reflected by air molecules and clouds back through the stratosphere to the satellite sensors.

In Dec 1998 the satellite was hit by a high-energy particle which disrupted the on-board computer and the satellite ended in safe mode. There was a problem with this mode and the stabilization processed exhumed the fuel. TRW came up with a solution to regain control over the satellite by using its magnetic torque. This was successful and the satellite uses this stabilization method since Jan 1999.

External resources


sat-index articles

End of life

Out of service Dec 2006
Cause Transmitter failure

Technical data


Prime contractor TRW
Platform STEP/Eagle
Mass at launch 261 kg
Mass in orbit 215 kg
Dimension 2.4 x 3.9 m
Solar array  
Stabilization 3 axis
DC power 128 W
Design lifetime 2 years

Single instrument: TOMS which already flew on Nimbus 7 (1978) and Meteor 3-05 (1991). It should also fly on Adeos 1

Telemetry: 2273.50 MHz (3 downlink rates: 1.1 kbps, 50 kbps, 200 kbps)
Command: 2093.51 MHz

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