BSAT-1a
| Mission type | Communications |
|---|---|
| Operator | BSAT |
| COSPAR ID | 1997-016B |
| SATCAT no. | 24769 |
| Mission duration | 13 years |
| Spacecraft properties | |
| Spacecraft | BSAT-1a |
| Bus | HS-376 |
| Manufacturer | Hughes |
| Launch mass | 1,236 kilograms (2,725 lb) |
| BOL mass | 723 kilograms (1,594 lb) |
| Dimensions | 3.15 m × 2.17 m (10.3 ft × 7.1 ft) (stowed for launch) |
| Power | 1,200 watts |
| Start of mission | |
| Launch date | 23:08:44, 16 April 1997 |
| Rocket | Ariane 44LP V-95 |
| Launch site | Kourou ELA-2 |
| Contractor | Arianespace |
| Entered service | 1 August 1997 |
| End of mission | |
| Disposal | placed in a graveyard orbit |
| Deactivated | 3 August 2010 |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Geostationary |
| Longitude | 110° east |
| Perigee | 36,097 kilometres (22,430 mi) |
| Apogee | 36,140 kilometres (22,460 mi) |
| Inclination | 3.33 degrees |
| Period | 24.21 hours |
| Epoch | 11 November 2014, 19:05:02 UTC |
| Transponders | |
| Band | Ku band: 4 (plus 4 spares) |
| Coverage area | Japan |
| TWTA power | 106 Watts |
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BSAT-1a 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 the main satellite 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 backup BSAT-1b, by BSAT-3a. On 3 August 2010, it was decommissioned and placed on a graveyard orbit.
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-1b on the 110°E longitude position for the B-SAT.
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