JCSAT-1
Mission typeCommunications
OperatorJSAT Corporation
COSPAR ID1989-020A[1]
SATCAT no.19874
Mission duration8 years (planned)
Spacecraft properties
SpacecraftJCSAT-1
Spacecraft typeJCSAT
BusHS-393
ManufacturerHughes
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.
Power2.350 kW
Start of mission
Launch date6 March 1989, 23:29:00 UTC[2]
RocketAriane 44LP
Launch siteCentre Spatial Guyanais, ELA-2
ContractorArianespace
End of mission
DisposalGraveyard orbit
Deactivated1998 [3]
Orbital parameters
Reference systemGeocentric orbit[4]
RegimeGeostationary orbit
Longitude150° East
Transponders
Band32 Ku-band × 27 Mhz [5]
Bandwidth864 MHz
Coverage areaJapan
TWTA power20 watts
 

JCSAT-1 was a geostationary communications satellite designed and manufactured by Hughes (now Boeing) on the HS-393 satellite bus. 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 150° East longitude until it was replaced by JCSAT-1B.[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 2350 watts of power thanks to two cylindrical solar panels.[5] It also had a two 38 Ah NiH2 batteries.[5] It would serve as the main satellite on the 150° East longitude position of the JSAT fleet.[5]

Its propulsion system was composed of two R-4D-12 liquid apogee engine (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 is 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 Traveling-wave tube#Traveling-wave-tube amplifier (TWTA) output power of 20 watts.[5]

History

With the opening of the Japanese satellite communications market to private investment, Japan Communications Satellite Company (JCSAT) was founded in 1985.[7][8] In 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-1 would become the first commercial Japanese communications satellite. It was successfully launched aboard an Ariane-44LP on 6 March 1989 at 23:29:00 UTC.[5] Originally expected to be retired in 1997, it was finally sent to a graveyard orbit on 1998.[3]

References

  1. ↑ "Display: JCSAT 1 1989-020A". NASA. 10 February 2021. Retrieved 20 March 2021. Public Domain This article incorporates text from this source, which is in the public domain.
  2. ↑ "Trajectory: JCSAT 1 1989-020A". NASA. 10 February 2021. Retrieved 20 March 2021. Public Domain This article incorporates text from this source, which is in the public domain.
  3. 1 2 Yanagisawa, Toshifumi (9 March 2016). "Lightcurve observations of LEO objects in JAXA" (PDF). JAXA. Archived from the original (PDF) on 26 August 2016. Retrieved 16 August 2016.
  4. ↑ "JCSAT 1". N2YO.com. Retrieved 16 August 2016.
  5. 1 2 3 4 5 6 7 8 9 10 11 Krebs, Gunter (21 April 2016). "JCSat 1, 2". Gunter's Space Page. Retrieved 20 July 2016.
  6. 1 2 "JCSAT 1, 2". Boeing. Archived from the original on 7 February 2010. Retrieved 16 August 2016.
  7. ↑ "History". SKY Perfect JSAT. Retrieved 28 July 2016.
  8. ↑ "JCSAT". Global Security. Retrieved 4 August 2016.
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