Summary
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]
| Mission type | Communications |
|---|---|
| Operator | JSAT Corporation |
| COSPAR ID | 1989-020A[1] |
| SATCAT no. | 19874 |
| Mission duration | 8 years (planned) |
| Spacecraft properties | |
| Spacecraft | JCSAT-1 |
| Spacecraft type | JCSAT |
| Bus | HS-393 |
| Manufacturer | Hughes |
| Launch mass | 2,280 kg (5,030 lb) |
| BOL mass | 1,364 kg (3,007 lb) |
| Dimensions | 3.7 m × 10 m × 2.3 m (12.1 ft × 32.8 ft × 7.5 ft) with solar panels and antennas deployed. |
| Power | 2.350 kW |
| Start of mission | |
| Launch date | 6 March 1989, 23:29:00 UTC[2] |
| Rocket | Ariane 44LP |
| Launch site | Centre Spatial Guyanais, ELA-2 |
| Contractor | Arianespace |
| End of mission | |
| Disposal | Graveyard orbit |
| Deactivated | 1998 [3] |
| Orbital parameters | |
| Reference system | Geocentric orbit[4] |
| Regime | Geostationary orbit |
| Longitude | 150° East |
| Transponders | |
| Band | 32 Ku-band × 27 Mhz [5] |
| Bandwidth | 864 MHz |
| Coverage area | Japan |
| TWTA power | 20 watts |
Satellite description edit
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 edit
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 edit
- ^ "Display: JCSAT 1 1989-020A". NASA. 10 February 2021. Retrieved 20 March 2021.
This article incorporates text from this source, which is in the public domain.
- ^ "Trajectory: JCSAT 1 1989-020A". NASA. 10 February 2021. Retrieved 20 March 2021. This article incorporates text from this source, which is in the public domain.
- ^ a b 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.
- ^ "JCSAT 1". N2YO.com. Retrieved 16 August 2016.
- ^ a b c d e f g h i j k Krebs, Gunter (21 April 2016). "JCSat 1, 2". Gunter's Space Page. Retrieved 20 July 2016.
- ^ a b "JCSAT 1, 2". Boeing. Archived from the original on 7 February 2010. Retrieved 16 August 2016.
- ^ "History". SKY Perfect JSAT. Retrieved 28 July 2016.
- ^ "JCSAT". Global Security. Retrieved 4 August 2016.
