Mission typeCommunication
OperatorJSAT Corporation
COSPAR ID1990-001B[1]
SATCAT no.20402
Spacecraft properties
Launch mass2,280 kg (5,030 lb)
BOL mass1,364 kg (3,007 lb)
Dimensions3.7 m × 10 m × 2.3 m (12.1 ft × 32.8 ft × 7.5 ft) with solar panels and antennas deployed.
Power2.2 kW
Start of mission
Launch date00:07:00, January 1, 1990 (UTC) (1990-01-01T00:07:00Z)[2]
RocketCommercial Titan III
Launch siteCape Canaveral LC-40
ContractorMartin Marietta
End of mission
Disposalplaced in a graveyard orbit
Orbital parameters
Reference systemGeocentric
RegimeInclined geosynchronous
Semi-major axis42657  km
Perigee altitude36,021.0 km
Apogee altitude36,552.2 km
Period1,461.3 minutes
Epoch00:00:00 2016-08-16[4]
BandKu band: 32 × 27 Mhz[5]
Bandwidth864 MHz
TWTA power20 Watts

JCSAT-2 was a geostationary communications satellite designed and manufactured by Hughes (now Boeing) on the HS-393 platform. It was originally ordered by Japan Communications Satellite Company (JCSAT), which later merged into the JSAT Corporation. It had a Ku band payload and operated on the 154°E longitude until it was replaced by JCSAT-2A.[5]

Satellite description

The spacecraft was designed and manufactured by Hughes on the HS-393 satellite bus. It had a launch mass of 2,280 kg (5,030 lb), a mass of 1,364 kg (3,007 lb) after reaching geostationary orbit and an 8-year design life. When stowed for launch, its dimensions were 3.4 m (11 ft) long and 3.7 m (12 ft) in diameter.[6] With its solar panels fully extended it spanned 10 m (33 ft).[5] Its power system generated approximately 2,350 Watts of power thanks to two cylindrical solar panels.[5] It also had a two 38Ah NiH2 batteries.[5] It would serve as the main satellite on the 150°E longitude position of the JSAT fleet.[5]

Its propulsion system was composed of two R-4D LAE with a thrust of 490 N (110 lbf). It also used two axial and four radial 22 N (4.9 lbf) bipropellant thrusters for station keeping and attitude control.[6] It included enough propellant for orbit circularization and 8 years of operation.[5]

Its payload was composed of a 2.4 m (7 ft 10 in) antenna fed by thirty-two 27 MHz Ku band transponders for a total bandwidth of 864 MHz.[5] The Ku band transponders had a TWTA output power of 20 Watts.[5]


With the opening of the Japanese satellite communications market to private investment, Japan Communications Satellite Company (JCSAT) was founded in 1985.[7][8] On June of the same year, JCSAT awarded an order to Hughes Space and Communications for two identical satellites, JCSAT-1 and JCSAT-2, based on the spin-stabilized HS-393 satellite bus.[5]

JCSAT-2 was successfully launched aboard a Commercial Titan III along Skynet 4A on January 1, 1990 at 00:07 UTC.[1][5]

Originally expected to be retired in 2000, it was finally sent to a graveyard orbit on 2002.[3]


  1. ^ a b "JCSAT 2". NASA Space Science Data Coordinated Archive. 27 April 2016. Retrieved 2016-08-04.
  2. ^ "JCSAT 2". NASA Space Science Data Coordinated Archive. 27 April 2016. Retrieved 2016-08-04.
  3. ^ a b Yanagisawa, Toshifumi (2016-03-09). "Lightcurve observations of LEO objects in JAXA" (PDF). JAXA. Retrieved 2016-08-16.
  4. ^ "JCSAT 2". n2yo.com. Retrieved 2016-08-16.
  5. ^ a b c d e f g h i j k Krebs, Gunter Dirk (2016-04-21). "JCSat 1, 2". Gunter's Space Page. Retrieved 2016-07-20.
  6. ^ a b "JCSAT 1,2". Boeing Satellite Development Center. Archived from the original on 2010-02-07. Retrieved 2016-08-16.
  7. ^ "History". SKY Perfect JSAT Holdings Inc. Retrieved 2016-07-28.
  8. ^ "JCSAT". Global Security. Retrieved 2016-08-04.