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		50.5°E inclined, Intelsat 26

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

---