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Also called Geosat Follow-on


Designation 25157 / 98007A
Launch date 10 Feb 1998
Country of origin United States
Operator Ball Corporation
Mission Military: remote sensing
Perigee/Apogee 800 km
Inclination 108°
Period 101 min
Launch vehicle Taurus #2
Launch site Vandenberg

Using an advanced radar altimeter (13.5 GHz), the GFO satellite is designed to provide precise information on changes in sea surface heights, eddies and warm/cold water fronts. The data will be used to support Navy tactical operations. The GFO contract was awarded to Ball Aerospace Systems Group in August 1992 by the U.S. Navy's Space and Naval Warfare systems command. The Navy contract calls for a "turnkey" satellite system, and contract options for two additional spacecraft. GFO will follow the successful Geosat satellite that completed service in January 1990.

Will downlink directly to vessels.

For the GFO mission, Taurus will use Thiokol's Castor 120 solid rocket motor as the vehicle's first stage, and incorporate a larger, Orbital-developed payload fairing, providing a 120% increase in payload volume. Modifications to the Taurus booster, particularly a new payload fairing twice the size of the one used on the first flight, will result in a much more capable rocket. This configuration was proposed for NASA's MedLite program, and another that results in an extra 500 pounds of secondary payload capability for the GFO mission.

The initial contract worth $115 million calls for 3 GFO satellites, the last one should be launched in 2007

End of life

Out of service 2009

External resources


sat-index articles

Technical data


Prime contractor Ball Aerospace & Technologies Corp.
Platform BCP-600
Mass at launch 365 kg
Mass in orbit  
Solar array  
DC power 126 W
Design lifetime 8 years

96 MB on-board storage

Carriers at 400.033 & 150.0125 MHz

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