HS-393

Boeing 393
Manufacturer Boeing Satellite Development Center
Country of origin United States
Applications Communications satellite
Specifications
Spacecraft type Spin-stabilized
Design life 8 years
Launch mass 2.2 to 2.5 t (2.4 to 2.8 tons)
Dimensions Diameter: 3.7 m (12 ft)
Height (stowed): 3.4 m (11 ft)
Height (deployed): 10 m (33 ft)
Power 2 to 2.2 kWatts
Batteries 2 × 38Ah NiH2 batteries
Regime Geostationary orbit
Production
Status Retired
Built 3
On order 3
Launched 3
Retired 3
First launch JCSAT-1 March 6, 1989
Last launch SBS 6, October 12, 1990
Related spacecraft
Derived from HS-376
← HS-376 Boeing 601 →

The Hughes 393 (sometimes referred to as the HS-393 is a communications satellite bus introduced in 1985 by Hughes Space and Communications Company. It was a spin-stabilized bus that had twice as much power as the HS-376 platform.[1][2]

Design

The satellite bus was designed and manufactured by Hughes. It had a launch mass of 2.2 to 2.5 t (2.4 to 2.8 tons), a mass of 1.35 to 1.5 t (1.49 to 1.65 tons) after reaching geostationary orbit and an 8-year design life. When stowed for launch, its dimensions were 3.4 m (11 ft) in height and 3.7 m (12 ft) in diameter.[1][3] With its solar panels fully extended its height was 10 m (33 ft).[4][5]

Its power system generated approximately 2,350 Watts of power at BOL and 2,200 at end of life, thanks to two cylindrical solar panels. These panels used K7 and K4-3/4 solar cells and were more than twice the number than on the HS-376[1] The bottom panel was retracted around the body and top panel for launch, and extended downwards for operation.[1] It also had a two 38Ah NiH2 batteries.[4]

Its propulsion system was composed of two R-4D LAE with a thrust of 490 N (110 lbf). It also had two axial and four radial 22 N (4.9 lbf) bipropellant thrusters for station keeping and attitude control.[1] It included enough propellant for orbit circularization and 8 years of operation.[4]

Its payload was composed of a 2.4 m (7 ft 10 in) antenna fed Ku band transponders.[1][3]

Satellites

The HS-393 was a powerful platform than the HS-376 platform, being able to supply 2,200kW of power versus 1,400 of the HS-376HP. But only three were ever built.[2]

Satellite Other Names Operator Model Ordered Launch Launch Vehicle Launch Result Mass at launch (kg) Mass at BOL (kg) Remarks
JCSAT-1JSAT CorporationHS-39319851989-03-06Ariane 44LPSuccess2,280 kg (5,030 lb)1,346 kg (2,967 lb)First Japanese commercial satellite.[4][1]
JCSAT-2JSAT CorporationHS-39319851990-01-01Commercial Titan IIISuccess2,280 kg (5,030 lb)1,346 kg (2,967 lb)[4][1]
SBS 6Satellite Business SystemsHS-39319851990-10-12Ariane 44LSuccess2,478 kg (5,463 lb)1,500 kg (3,300 lb)Launched along Galaxy 6.[5][3]

See also

References

  1. 1 2 3 4 5 6 7 8 "JCSAT 1,2". Boeing Satellite Development Center. Archived from the original on 2010-02-07. Retrieved 2016-08-17.
  2. 1 2 Krebs, Gunter Dirk (2016-04-21). "Hughes: HS-393". Gunter's Space Page. Retrieved 2016-08-17.
  3. 1 2 3 "SBS 6". Boeing Satellite Development Center. Archived from the original on 2010-02-07. Retrieved 2016-08-17.
  4. 1 2 3 4 5 Krebs, Gunter Dirk (2016-08-17). "JCSat 1, 2". Gunter's Space Page. Retrieved 2016-07-20.
  5. 1 2 Krebs, Gunter Dirk (2016-08-17). "SBS 6". Gunter's Space Page. Retrieved 2016-07-20.
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