Country of origin United States Built 58 | Spacecraft type Spin-stabilized Status Retired Launch date 12 April 1985 | |
Similar Spacebus, IndoStar‑1, Telkom‑2, Morelos Satellite, Paksat‑1 | ||
The Boeing 376 (sometimes referred to as the BSS-376, and previously as the HS-376) is a communications satellite bus introduced in 1978 by Hughes Space and Communications Company. It was a spin-stabilized bus that the manufacturer claims was the first standardized platform.
Contents
Design
The satellite bus was designed and manufactured by Hughes. This spin-stabilized platform had two main sections. One, the spinning section, was kept rotating at 50 rpm to maintain attitude, and a despun section that was used by the payload to maintain radio coverage.
The spinning section included the Apogee kick motor, most of the attitude control, the power subsystem and the command and telemetry subsystems. The despun section contained the communications payload, including the antennas and transponders.
The stock version had a launch mass of 1,100 to 1,450 kg (2,430 to 3,200 lb), a mass of 540 to 790 kg (1,190 to 1,740 lb) after reaching geostationary orbit and an 8 to 10-year design life. When stowed for launch, its dimensions were 2.8 to 3.15 m (9 ft 2 in to 10 ft 4 in) in height and 2.16 m (7 ft 1 in) in diameter. With its solar panels fully extended its height was 6.6 to 8 m (22 to 26 ft).
Its power system generated approximately 1,100 Watts to 1,200 Watts of power at BOL, thanks to two cylindrical solar panels.The bottom panel was retracted around the body and top panel for launch, and extended downwards for operation. It also had a two NiCd batteries for solar eclipses.
Versions
There were four variations of this platform:
Satellites
The HS-376 was a very successful satellite platform with 58 satellites ordered, built and launched. It was also the first satellite to launch from the Space Shuttle.