BSAT-1b
| Mission type | Communication |
|---|---|
| Operator | JSAT Corporation |
| COSPAR ID | 1998-024B |
| SATCAT no. | 25312 |
| Mission duration | 13 years |
| Spacecraft properties | |
| Spacecraft | BSAT-1b |
| Bus | HS-376 |
| Manufacturer | Hughes |
| Launch mass | 1,236 kg (2,725 lb) |
| BOL mass | 723 kg (1,594 lb) |
| Dimensions | 3.15 m × 2.17 m (10.3 ft × 7.1 ft) (stowed for launch) |
| Power | 1.2 kW |
| Start of mission | |
| Launch date | 22:53, April 28, 1998 |
| Rocket | Ariane 44P V-108 |
| Launch site | Kourou ELA-2 |
| Contractor | Arianespace |
| Entered service | August 1, 1998 |
| End of mission | |
| Disposal | placed in a graveyard orbit |
| Deactivated | August 2011 |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Graveyard orbit |
| Semi-major axis | 42,373 km |
| Perigee | 35,987.0 km |
| Apogee | 36,018.1 km |
| Inclination | 14.5° |
| Period | 1,446.8 minutes |
| Epoch | 00:00:00 2016-09-08 |
| Transponders | |
| Band | Ku band: 4 (plus 4 spares) |
| Coverage area | Japan |
| TWTA power | 106 Watts |
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BSAT-1b was a geostationary communications satellite designed and manufactured by Hughes (now Boeing) on the HS-376 platform. It was originally ordered and operated by the Broadcasting Satellite System Corporation (B-SAT). It was used as backup of BSAT-1a to broadcast television channels for NHK and WOWOW over Japan. It had a pure Ku band payload and operated on the 110°E longitude until it was replaced, along its twin BSAT-1a, by BSAT-3a.
The spacecraft was designed and manufactured by Hughes on the HS-376 satellite bus. 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 Star-30BP 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.
It had a launch mass of 1,236 kg (2,725 lb), a mass of 723 kg (1,594 lb) after reaching geostationary orbit and an 10-year design life. When stowed for launch, its dimensions were 3.15 m (10.3 ft) long and 2.17 m (7 ft 1 in) in diameter. With its solar panels fully extended it spanned 7.97 m (26.1 ft). Its power system generated approximately 1,200 Watts of power thanks to two cylindrical solar panels. It also had a NiH2 batteries for surviving solar eclipses. It would serve along BSAT-1a on the 110°E longitude position for the B-SAT.
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