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Mtsat 1

Multi-functional Transport Satellite


Designation n/a
Launch date 15 Nov 1999
Country of origin Japan
Mission Telecommunications and meteorology
Geostationary orbit 140°E
Launch vehicle H2 #7

Japanese system for air traffic control and weather observation. Ordered by the Japanese Ministry for Transport & Meteorological agency to Space Systems/Loral ($102 million). Is the successor of the GMS program (was to replace GMS 5). The navigation system is the equivalent of the US WASS and European EGNOS programs.

End of life

Out of service 15 Nov 1999
Cause Launcher failed

In Jun 1999 the satellite had to be shipped back to SS/L after a part for the power supply in a similar product was found defective. The satellite was not insured.

External resources


Technical data


Prime contractor SS/L
Platform FS-1300
Mass at launch 2900 kg
Dry mass 1223 kg
Dimension 2.4 x 2.6 x 2.6 m
Solar array 1 single panel
Stabilization 3-axis
DC power EOL: 2700 W
Design lifetime 10-years

Should have operated in UHF-, L-, S-, Ku- and Ka-band

Weather sensor built by ITT Aerospace/Commnucations division. The rest of the payload was built by Alcatel Space Industries.

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