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COMETS (Kakehashi)

COMETS (Kakehashi) [NASDA]

COMETS (Communication Engineering Test Satellite) a two-ton geostationary three-axis stabilized satellite, is being created to develop the new technologies required for future fields in communications and broadcasting.

Relay satellites in geostationary orbit will be used to develop the following technologies:

  • Inter-orbit communications technology for relay of communications between observation satellites or space stations in low-altitude circular orbits and earth stations.
  • Advanced satellite broadcast technology for broad-band region-specific broadcasts and high definition television broadcasts using K-band frequency bands.
  • Development of advanced mobile satellite communications technology possessing reproduction relay and inter-beam connection functions by employing K-bands and miliband frequencies.

The COMETS was launched by its 5th H-2 Launch Vehicle on 21 February 1998. Though the first burnig was normal, the second burning time period of the second-stage engine was shorter than scheduled which resulted in injection of the COMETS satellite to lower orbit than the geostationary transfer orbit. Due to successful seven orbital maneuvres, COMETS has been moved to recurrent orbit. It was used for conducting scheduled experiments on the orbit as possible.

The routine operetion phase of the COMETS was bought to an end on January 31,1999, and its extended phese started. NASDA terminated its operation on 6 August 1999.

Nation: Japan
Type / Application: Communication
Operator: NASDA
Equipment: 5(+1) Ka-band 200W transponders
Propulsion: 1700 N apogee kick engine, 2 ion thrusters
Power: 2 deployable solar arrays, batteries
Lifetime: 3 years
Mass: 3900 kg
Orbit: GEO
Satellite COSPAR Date LS Launch Vehicle Remarks
COMETS (Kakehashi) 1998-011A 21.02.1998 Ta YLP-1 p H-2