NamesJCSAT-5 (Jun 1996 to Dec 1997)
JCSAT-1B (Dec 1997 onward)
Mission typeCommunications
OperatorSKY Perfect JSAT Group
COSPAR ID1997-075A [1]
SATCAT no.25067
Mission duration12 years (planned)
Spacecraft properties
Spacecraft typeJCSAT
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 date2 December 1997, 22:52:32 UTC [1]
RocketAriane 44P
Launch siteCentre Spatial Guyanais, ELA-2
Orbital parameters
Reference systemGeocentric orbit
RegimeGeostationary orbit
Longitude150° East
16 × 36 Mhz + 16 × 27 Mhz
Bandwidth1008 MHz
Coverage areaJapan, East Asia, South Asia, Australia, Hawaii
TWTA power12 × 36 Mhz 95 watts
4 × 36 Mhz 60 watts
16 × 27 Mhz 60 watts

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 satellite bus. 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.[2][3][4]

Satellite description

The spacecraft was designed and manufactured by Boeing Satellite Development Center on the HS-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, South Asia, Australia and Hawaii.[2]

Its payload is composed of sixteen 36 MHz plus another sixteen 27 MHz Ku-band transponders, for a total bandwidth of 1008 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][2] It can configure four 36 MHz transponders into two 76 MHz with an effective 95 watts.[2]

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 Space and Communications Company (now Boeing Satellite Development Center), to replace JCSAT-1 at the 150° East slot. The HS-601 based satellite would provide coverage to Japan, East Asia, Australia and Hawaii.[2]

An Ariane 44P successfully launched JCSAT-5 on 2 December 1997 at 22:52:32 UTC from Centre Spatial Guyanais 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.[2]

The satellite experienced an anomaly on 17 January 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.[2]


  1. ^ a b "Display: JCSAT 5 1997-075A". NASA. 10 February 2021. Retrieved 20 March 2021. Public Domain This article incorporates text from this source, which is in the public domain.
  2. ^ a b c d e f g Krebs, Gunter (21 April 2016). "JCSat 5, 6 (JCSat 1B, 4A)". Gunter's Space Page. Retrieved 20 July 2016.
  3. ^ "JCSat 1B (JCSat 5)". Satbeams. Retrieved 26 July 2016.
  4. ^ a b c d "JCSAT-1B". SKY Perfect JSAT. Archived from the original on 18 August 2016. Retrieved 9 August 2016.
  5. ^ "Who we are?". SKY Perfect JSAT. 3 August 2012. Retrieved 2 August 2016.