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Rocsat 1

Also called Formosat 2


Designation 25616 / 99002A
Launch date 27 Jan 1999
Country of origin Taiwan
Operator NSPO (National Space Program Office)
Mission Scientific: ionosphere study
Perigee/Apogee 600 km
Inclination 35°
Period 97 min
Launch vehicle Athena #4

The satellite will be used for scientific research including ocean color imaging, experiments on ionospheric plasma and elecrodynamics, and K-band communications experiments. The K-band cannot be used because of a license problem.

Contract worth $61 million for the satellite, $19 million for its launch

End of life

Decay 22 May 2023

Technical data


Prime contractor TRW
Platform STEP
Mass at launch 425 kg
Mass in orbit  
Dimension 1.10 m diameter x 2.02 m long
Solar array 2 wings, 1.16 x 2.46 m
Stabilization 3-axis
DC power 450 W
Design lifetime 1 year

Ocean Color Imager (OCI)

Wavebands 443 nm (+/- 4)
490 nm (+/- 4)
510 nm (+/- 4)
555 nm (+/- 4)
670 nm (+/- 4)
865 nm (+/- 5)
Swath width 691.2 km
Resolution 800 m

Ionospheric Plasma and Electrodynamics Instrument (IPEI)

Will help scientists gain a better understanding of the ionospheric structure above Taiwan, which is of great importance in determining effects on radio communications

Experimental Communication Payload (ECP)

Main transponders 1
Backup transponders  
Power 10 W
Bandwidth 27 MHz
EIRP max  
G/T max  
Polarization circular
Frequencies uplink: 28.25 GHz (RHCP)
downlink: 14.45 GHz (LHCP)

Beacon: 19.5 GHz (1.77 W)
S-band communications, uplink at 2 kbps, downlink at 1.4 Mbps. 2 GB onboard storage

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