BSAT-1b

Last updated
BSAT-1b
Mission type Communication
Operator JSAT Corporation
COSPAR ID 1998-024B [1]
SATCAT no. 25312
Mission duration13 years
Spacecraft properties
SpacecraftBSAT-1b
Bus HS-376
Manufacturer Hughes
Launch mass1,236 kg (2,725 lb)
BOL mass 723 kg (1,594 lb)
Dimensions3.15 m × 2.17 m (10.3 ft × 7.1 ft) (stowed for launch) [2]
Power1.2 kW
Start of mission
Launch date22:53,April 28, 1998(UTC) (1998-04-28T22:53Z) [3]
Rocket Ariane 44P V-108
Launch site Kourou ELA-2
Contractor Arianespace
Entered serviceAugust 1, 1998
End of mission
Disposalplaced in a graveyard orbit
DeactivatedAugust 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 areaJapan
TWTA power106 Watts
←  BSAT-1a
BSAT-2a  →
 

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]

Contents

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. [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]

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. [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]

Related Research Articles

JSAT Corporation (JSAT) was the first private Japanese satellite operator, which owned the JSAT satellites, as well as operated and partially owned the N-Star with NTT DoCoMo. Its origins can be traced to the funding of Japan Communications Satellite Company (JCSAT) and Satellite Japan Corporation in 1985. Both companies merged into Japan Satellite Systems Inc. in 1993. In 2000 the company was renamed as JSAT Corporation and was listed in the First Section of the Tokyo Stock Exchange. On September 1, 2008, the company was merged into the SKY Perfect JSAT Group.

The Broadcasting Satellite System Corporation (B-SAT) is a Japanese corporation established in April 1993 to procure, manage and lease transponders on communications satellites. Its largest stockholder, owning 49.9%, is NHK, the Japan Broadcasting Corporation. In 1994, it was ranked by Space News as the world's 19th largest fixed satellite operator.

This page includes a list of satellite buses, of which multiple similar artificial satellites have been, or are being, built to the same model of structural frame, propulsion, spacecraft power and intra-spacecraft communication. Only commercially available buses are included, thus excluding series-produced proprietary satellites operated only by their makers.

BSAT-1a was a geostationary communications satellite designed and manufactured by Hughes 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.

BSAT-2a, was a geostationary communications satellite operated by B-SAT which was designed and manufactured by Orbital Sciences Corporation on the STAR-1 platform. It was stationed on the 110° East orbital slot along its companion BSAT-2c from where they provided redundant high definition direct television broadcasting across Japan.

BSAT-2b, was a geostationary communications satellite ordered by B-SAT which was designed and manufactured by Orbital Sciences Corporation on the STAR-1 platform. It was designed to be stationed on the 110° East orbital slot along its companion BSAT-2a where it would provide redundant high definition direct television broadcasting across Japan.

BSAT-2c, was a geostationary communications satellite operated by B-SAT and was designed and manufactured by Orbital Sciences Corporation on the STAR-1 platform. It was stationed on the 110° East orbital slot along its companion BSAT-2a from where they provided redundant high definition direct television broadcasting across Japan.

BSAT-3a, is a geostationary communications satellite operated by Broadcasting Satellite System Corporation (B-SAT) which was designed and manufactured by Lockheed Martin on the A2100 platform. It is stationed on the 110,0° East orbital slot with its companion BSAT-3b and BSAT-3c from where they provide redundant high definition direct television broadcasting across Japan.

BSAT-3b, is a geostationary communications satellite operated by Broadcasting Satellite System Corporation (B-SAT) which was designed and manufactured by Lockheed Martin on the A2100 platform. It is stationed on the 110.0° East orbital slot along its companion BSAT-3a and BSAT-3c from where they provide redundant high definition direct television broadcasting across Japan.

BSAT-3c, also known as JCSAT-110R, is a geostationary communications satellite operated by Broadcasting Satellite System Corporation (B-SAT) and SKY Perfect JSAT (JSAT) which was designed and manufactured by Lockheed Martin on the A2100 platform.

BSAT-4a is a geostationary communications satellite ordered by Broadcasting Satellite System Corporation (BSAT) and designed and manufactured by SSL on the SSL 1300 platform, to be stationed on the 110.0° East orbital slot for direct television broadcasting of 4K and 8K Ultra HD resolutions. It was launched on 29 September 2017.

Superbird-A2, known as Superbird-6 before launch, was a geostationary communications satellite ordered and operated by Space Communications Corporation (SCC) that was designed and manufactured by Hughes on the BSS-601 satellite bus. It had a mixed Ku-band and Ka-band payload and was expected replace Superbird-A at the position at 158° East longitude. It was expected to provided television signals and business communications services throughout Japan, South Asia, East Asia, and Hawaii.

The JSAT constellation is a communication and broadcasting satellite constellation formerly operated by JSAT Corporation and currently by SKY Perfect JSAT Group. It has become the most important commercial constellation in Japan, and fifth in the world. It has practically amalgamated all private satellite operators in Japan, with only B-SAT left as a local competitor.

JCSAT-4 was known as JCSAT-R until it was sold to INTELSAT in 2009. It is a geostationary communications satellite designed and manufactured by Hughes on the HS-601 satellite bus. It was originally ordered by JSAT Corporation, which later merged into the SKY Perfect JSAT Group. It has a mixed Ku-band and C-band payload and was used as an on orbit spare.

JCSAT-3 was a geostationary communications satellite designed and manufactured by Hughes on the HS-601 satellite bus. It was originally ordered by JSAT Corporation, which later merged into the SKY Perfect JSAT Group. It has a mixed Ku-band and C-band payload and operated on the 128° East longitude until it was replaced by JCSAT-3A.

JCSAT-2 was a geostationary communications satellite designed and manufactured by Hughes on the HS-393 satellite bus. It was originally ordered by Japan Communications Satellite Company (JCSAT), which later merged into the JSAT Corporation. It had a Ku-band payload and operated on the 154° East longitude until it was replaced by JCSAT-2A.

The Boeing 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.

SBS 6 was a geostationary communications satellite designed and manufactured by Hughes on the HS-393 platform. It was originally ordered by Satellite Business Systems, which later sold it to Hughes Communications and was last used by Intelsat. It had a Ku band payload and operated on the 95°W longitude.

The GEOStar is a family of satellite buses designed and manufactured by Northrop Grumman Innovation Systems. The family started focused on small geostationary communications satellites. The first iterations focused on the sub-5 kW commercial segment that was left vacated after the retirement of the HS-376 satellite bus. It started with the STARBus on CTA Space Systems, which was later bought by Orbital Sciences, Orbital ATK and now Northrop Grumman Innovation Systems.

BSAT-4b, is a geostationary communications satellite ordered by Broadcasting Satellite System Corporation and designed and manufactured by SSL of Maxar Technologies on the SSL 1300 platform. It is expected to be stationed on the 110.0° East orbital latitude for direct television broadcasting of 4K and 8K Ultra HD television resolutions.

References

  1. ↑ "BSAT 1B". NASA Space Science Data Coordinated Archive. 27 April 2016. Retrieved 2016-08-04.
  2. 1 2 3 4 5 6 7 8 "BSAT-1". Boeing Satellite Development Center. Archived from the original on 2010-02-07. Retrieved 2016-09-08.
  3. 1 2 "BSAT 1B". NASA Space Science Data Coordinated Archive. 27 April 2016. Retrieved 2016-08-04.
  4. 1 2 3 4 5 "Milestones". Broadcasting Satellite System Corporation. Archived from the original on 2016-09-08. Retrieved 2016-09-09.
  5. ↑ "BSAT 1B". n2yo.com. Retrieved 2016-09-08.
  6. 1 2 "Broadcasting Satellite System Corporation (B-SAT)". Global Security. Retrieved 2016-09-08.
  7. ↑ "Space Japan Milestone – Broadcasting Satellite System Corporation (B-SAT)" (PDF). Space Japan Review (English Version). AIAA JFSC (36). September 2004. Archived from the original (PDF) on 2016-09-09. Retrieved 2016-09-09.
  8. 1 2 3 4 Krebs, Gunter Dirk (2016-09-08). "BSat 1a, 1b". Gunter's Space Page. Retrieved 2016-07-20.
  9. ↑ Hattori, Yoshihito (January 2008). "Report – Trends in Satellite Broadcasting" (PDF). Space Japan Review (English Version). AIAA JFSC (53). Archived from the original (PDF) on 2016-09-09. Retrieved 2016-09-09.
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