NamesJCSAT-5 (Jun 1996 to Dec 1997) JCSAT-1B (Dec 1997 onward)
Mission typeCommunication
OperatorSKY Perfect JSAT Group
COSPAR ID1997-075A[1]
SATCAT no.25067[2]
Spacecraft properties
Launch mass2,982 kg (6,574 lb)
Dry mass1,308 kg (2,884 lb)
Dimensions26.1 m × 7.6 m (86 ft × 25 ft) with solar panels and antennas deployed.
Power5 kW
Start of mission
Launch date22:52:32, December 2, 1997 (UTC) (1997-12-02T22:52:32Z)[1]
RocketAriane 44P
Launch siteGSC ELA-2
Orbital parameters
BandKu band: 16 × 36 Mhz + 16 × 27 Mhz
Bandwidth1,008 MHz
TWTA power12 × 36 Mhz 95 Watts
4 × 36 Mhz 60 Watts
16 × 27 Mhz 60Watts

JCSAT-1B, known as JCSAT-5 before launch, is a geostationary communications satellite operated by SKY Perfect JSAT Group (JSAT) which was designed and manufactured by Hughes (now Boeing) on the HS-601 platform. It has a pure Ku band payload and was used to replace JCSAT-1 at the 150°East longitude. It covers Japan, Korea, most of China, Thailand, Vietnam, Laos, part of Indonesia, part of Malaysia and Hawaii.[3][2][4]

Satellite description

The spacecraft was designed and manufactured by Boeing on the BSS-601 satellite bus. It had a launch mass of 2,982 kg (6,574 lb) and a 12-year design life. Its solar panels span 21 m (69 ft) when fully deployed and generated approximately 5 kW of power, with its antennas in fully extended configuration it is 7.6 m (25 ft) wide.[4] It would provide communications services throughout Japan, East Asia, Australia and Hawaii.[3]

Its payload is composed of sixteen 36 MHz plus another sixteen 27 MHz Ku band transponders, for a total bandwidth of 1,008 MHz.[5] Its twelve of the 36 MHz transponders have a TWTA output power of 95 Watts, the other four 36 MHz and the 27 MHz ones have 60 Watts.[4][3] It can configure four 36 MHz transponders into two 76 MHz with an effective 95 Watts.[3]

The Ku band footprint covers Japan, Korea, most of China, Thailand, Vietnam, Laos, part of Indonesia, part of Malaysia and Hawaii.[4]


In June 1996, JSAT (since then merged into SKY Perfect JSAT Group) ordered JCSAT-5 from Hughes (now Boeing), to replace JCSAT-1 at the 150° East slot. The HS-601 based satellite would provide coverage to Japan, East Asia, Australia and Hawaii.[3]

An Ariane 44P successfully launched JCSAT-5 on December 2, 1997 at 22:52:32 UTC from Guiana Space Centre ELA-2 launch pad. Once successfully deployed, it was renamed as JCSAT-1B. It was driven to the 150°East position where it replaced JCSAT-1.[3]

The satellite experienced an anomaly on January 17, 2007 on one of its thrusters. But after the operator designed a control scheme to handle the satellite without the failed thruster, it was put back into service.[3]


  1. ^ a b "JCSAT 5". NASA Space Science Data Coordinated Archive. 27 April 2016. Retrieved 2016-08-04.
  2. ^ a b "JCSat 1B (JCSat 5)". Satbeams. Retrieved 26 July 2016.
  3. ^ a b c d e f g Krebs, Gunter Dirk (2016-04-21). "JCSat 5, 6 (JCSat 1B, 4A)". Gunter's Space Page. Retrieved 2016-07-20.
  4. ^ a b c d "JCSAT-1B". SKY Perfect JSAT Group. Retrieved August 9, 2016.
  5. ^ "Who we are" (PDF). SSKY Perfect JSAT Group. 2012-08-03. Retrieved 2016-08-02.