Английская Википедия:BSAT-1a
Шаблон:Infobox spaceflight 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.[1][2][3][4] On 3 August 2010, it was decommissioned and placed on a graveyard orbit.[5]
Satellite description
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.[1][6]
It had a launch mass of Шаблон:Convert, a mass of Шаблон:Convert after reaching geostationary orbit and a 10-year design life. When stowed for launch, its dimensions were Шаблон:Convert long and Шаблон:Convert in diameter. With its solar panels fully extended it spanned Шаблон:Convert.[1] Its power system generated approximately 1,200 Watts of power thanks to two cylindrical solar panels.[6] It also had a NiH2 batteries for surviving solar eclipses.[1] It would serve along BSAT-1b on the 110°E longitude position for the B-SAT.[6]
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.[1]
History
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.[3] In June 1994, it orders two HS-376 satellite from Hughes (now Boeing), BSAT-1a and BSAT-1b.[1]
During 1997 B-SAT completed its Kawaguchi and Kimitsu satellite control centers. At 23:08:44 UTC, 16 April 1997 the Ariane-44LP flight V-95 successfully launched BSAT-1a, along Thaicom 3, from Kourou ELA-2 launch pad.[7][6] On 1 August 1997, BSAT-1b entered into commercial service.[2]
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. On 3 August 2010, BSAT-1a was placed in a graveyard orbit and decommissioned.[2][8]
References
Шаблон:Portal Шаблон:BSAT satellites Шаблон:Orbital launches in 1997
Шаблон:Use dmy dates Шаблон:Use British English
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- Английская Википедия
- Communications satellites in geostationary orbit
- Spacecraft launched in 1997
- Satellites using the HS-376 bus
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