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Jcsat 6

Also called Jcsat 4A


Designation 25630 / 99006A
Launch date 16 Feb 1999
Country of origin Japan
Mission Telecommunications
Geostationary orbit see below
Launch vehicle Atlas 2AS #119

Had to be removed from atop the rocket in Jan 1999 and shipped back to the manufacturer justs days before planned launch. The satellite had already experienced bad luck when it was damaged by a power surge when lightning stroke its processing facility.


Begin End Position
L: 16 Feb 1999 Apr 1999 120°E
Jun 1999 Feb 2013 124°E (became Jcsat 4A)
May 2013 Sep 2014 82°E
Sep 2014 Apr 2017 82°E, inclined
Jul 2017 Jan 2020 150°E, inclined
Feb 2020 Nov 2021 136°E, inclined

End of life

Out of service Dec 2021
Cause Sent to junk orbit

sat-index articles

Technical data

Lyngsat transponder loading

EIRP coverage (dBW)


Prime contractor Hughes
Platform HS-601
Mass at launch 2900 kg
Mass in orbit 1841 kg
Dry mass 1230 kg
Dimension stowed: 2.8 x 3.8 x 4.3 m
Solar array 26.2 m span
Stabilization 3-axis
DC power 5000 W
Design lifetime 12 years


Main transponders 32
Backup transponders  
Power 75 W (TWTA)
Bandwidth 27 MHz
Coverage & EIRP max Japan mainland and Japanese islands
Polarization linear H/V

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