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Jcsat 4


Also called Jcsat 1A and Jcsat R

General


Designation 24732 / 97007A
Launch date 17 Feb 1997
Country of origin Japan
Mission Telecommunications
Geostationary orbit see below
Launch vehicle Atlas 2AS


Location


Begin End Position
L: 17 Feb 1997 Apr 1997 141°E
May 1997 Feb 1998 150°E (became Jcsat 1A)
Mar 1998 Jun 1999 124°E (became Jcsat R on 15 Jun 1999)
Jul 1999 Jan 2005 127°E
Feb 2005 Feb 2005 149.5°E (probably incorrect)
Mar 2005 Jul 2005 127.5°E
Jul 2005 Sep 2009 150°E (probably incorrect)
Sep 2009 Jan 2010 127.5°E
May 2010 Aug 2013 50.5°E inclined, Intelsat 26
Oct 2013 Oct 2015 65.8°E inclined
Nov 2015 Jul 2016 62.2°E inclined
Aug 2016 Jul 2017 64.2°E inclined
Jul 2017 Sep 2018 65.8°E inclined
Oct 2018   62.2°E inclined

Satellite ordered after a Jcsat 1 problem (slight leak) was detected.

In Dec 2010, the satellite was acquired by Intelsat to provide C-band coverage in Africa and Ku-band coverage in the Middle East.

sat-index articles


Technical data


Lyngsat transponder loading



Specifications


Prime contractor Hughes
Platform HS-601 (#58)
Mass at launch  
Mass in orbit 1841 kg
Dimension stowed: 2.8 x 3.8 x 4.9 m
Solar array 26.2 m span
Stabilization 3-axis
DC power 5000 W
Design lifetime 12 years

Features 4 octagonal communications antennas. The main control station is in Yokohama, with backup control at Gunma.

C-band


Main transponders 12
Backup transponders  
Power 34 W (SSPA)
Bandwidth 36 MHz
Coverage Asia & Australia
EIRP max 37 dBW
Polarization linear H/V


Ku-band


Main transponders 28
Backup transponders  
Power 60 W (TWTA)
+ four 90 W (TWTA) for 4 36 MHz transponders
Bandwidth 8 transponders of 36 MHz
16 transponders of 27 MHz (4 transponders can be switched to 54 MHz with 120 W)
Coverage & EIRP max Japan: 55 dBW
Eastern Asia, India & Australia: 43-35 dBW
Polarization Linear H/V


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