Jcsat 4

Also called Jcsat 1A and Jcsat R and Intelsat 26

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General

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

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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	Nov 2019	62.2°E inclined
Nov 2019	Jun 2021	63.6°E inclined
Jun 2021	Nov 2021	66.1°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.

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End of life

Out of service	Nov 2021
Cause	Sent to junk orbit

sat-index articles

Technical data

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Lyngsat transponder loading

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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.

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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

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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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