Mission type | Communication |
---|---|
Operator | JSAT Corporation |
COSPAR ID | 1998-024B [1] |
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) [2] |
Power | 1.2 kW |
Start of mission | |
Launch date | 22:53, April 28, 1998 (UTC)[3] |
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 [4] |
Orbital parameters | |
Reference system | Geocentric |
Regime | Graveyard orbit |
Semi-major axis | 42,373 km |
Perigee altitude | 35,987.0 km |
Apogee altitude | 36,018.1 km |
Inclination | 14.5° |
Period | 1,446.8 minutes |
Epoch | 00:00:00 2016-09-08 [5] |
Transponders | |
Band | Ku band: 4 (plus 4 spares) [2] |
Coverage area | Japan |
TWTA power | 106 Watts |
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. [2] [4] [6] [7]
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. [2] [8]
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 a 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). [2] Its power system generated approximately 1,200 Watts of power thanks to two cylindrical solar panels. [8] It also had a NiH2 batteries for surviving solar eclipses. [2] It would serve along BSAT-1a on the 110°E longitude position for the B-SAT. [8]
Its payload was composed of a four active plus four spares Ku band transponders fed by a TWTA with an output power of 106 Watts. Its footprint covered Japan and its surrounding island. [2]
Broadcasting Satellite System Corporation (B-SAT) was founded in 1993 to broadcast by satellite the analog signals of NHK and WOWOW, including analog high definition Hi-Vision channels. [6] In June 1994, it orders two HS-376 satellite from Hughes (now Boeing), BSAT-1a and BSAT-1b. [2]
During 1997 B-SAT completed its Kawaguchi and Kimitsu satellite control centers, launched and commissioned BSAT-1a. [4] At 22:53 UTC, April 28, 1998, the Ariane-44P flight V-108 successfully launched BSAT-1b, along Nilesat 101, from Kourou ELA-2 launch pad. [3] [8]
On August 1, 1998, BSAT-1b entered into commercial service. In December 2000, due to launch delays of BSAT-2a, BSAT-1b started digital broadcasting services for B-SAT. [4]
During May 2005, B-SAT ordered BSAT-3a, the replacement satellite for BSAT-1a and BSAT-1b. It was successfully launched in August 2007, and accepted into the fleet the next month. During November, 2007 BSAT-3a took over the broadcasting of analog and digital signals from BSAT-1a and BSAT-1b. In August 2011, BSAT-1b was placed in a graveyard orbit and decommissioned. [4] [9]
Mission type | Communication |
---|---|
Operator | JSAT Corporation |
COSPAR ID | 1998-024B [1] |
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) [2] |
Power | 1.2 kW |
Start of mission | |
Launch date | 22:53, April 28, 1998 (UTC)[3] |
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 [4] |
Orbital parameters | |
Reference system | Geocentric |
Regime | Graveyard orbit |
Semi-major axis | 42,373 km |
Perigee altitude | 35,987.0 km |
Apogee altitude | 36,018.1 km |
Inclination | 14.5° |
Period | 1,446.8 minutes |
Epoch | 00:00:00 2016-09-08 [5] |
Transponders | |
Band | Ku band: 4 (plus 4 spares) [2] |
Coverage area | Japan |
TWTA power | 106 Watts |
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. [2] [4] [6] [7]
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. [2] [8]
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 a 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). [2] Its power system generated approximately 1,200 Watts of power thanks to two cylindrical solar panels. [8] It also had a NiH2 batteries for surviving solar eclipses. [2] It would serve along BSAT-1a on the 110°E longitude position for the B-SAT. [8]
Its payload was composed of a four active plus four spares Ku band transponders fed by a TWTA with an output power of 106 Watts. Its footprint covered Japan and its surrounding island. [2]
Broadcasting Satellite System Corporation (B-SAT) was founded in 1993 to broadcast by satellite the analog signals of NHK and WOWOW, including analog high definition Hi-Vision channels. [6] In June 1994, it orders two HS-376 satellite from Hughes (now Boeing), BSAT-1a and BSAT-1b. [2]
During 1997 B-SAT completed its Kawaguchi and Kimitsu satellite control centers, launched and commissioned BSAT-1a. [4] At 22:53 UTC, April 28, 1998, the Ariane-44P flight V-108 successfully launched BSAT-1b, along Nilesat 101, from Kourou ELA-2 launch pad. [3] [8]
On August 1, 1998, BSAT-1b entered into commercial service. In December 2000, due to launch delays of BSAT-2a, BSAT-1b started digital broadcasting services for B-SAT. [4]
During May 2005, B-SAT ordered BSAT-3a, the replacement satellite for BSAT-1a and BSAT-1b. It was successfully launched in August 2007, and accepted into the fleet the next month. During November, 2007 BSAT-3a took over the broadcasting of analog and digital signals from BSAT-1a and BSAT-1b. In August 2011, BSAT-1b was placed in a graveyard orbit and decommissioned. [4] [9]