JCSAT-4
Names | JCSAT-4 (1995–1997) JCSAT-R (1997–2009) Intelsat 26 (2009–present) |
---|---|
Mission type | Communications |
Operator | JSAT/Intelsat |
COSPAR ID | 1997-007A[1] |
SATCATno. | 24732[2] |
Mission duration | 12 years (planned) |
Spacecraft properties | |
Spacecraft | JCSAT-4 |
Spacecraft type | JCSAT |
Bus | HS-601 |
Manufacturer | Hughes |
Launch mass | 3,105 kg (6,845 lb) |
Dry mass | 1,841 kg (4,059 lb) |
Dimensions | 26.2 m × 7.5 m (86 ft × 25 ft) withsolar panelsand antennas deployed |
Power | 5kW |
Start of mission | |
Launch date | 17 February 1997, 01:42:02UTC[1] |
Rocket | Atlas IIAS |
Launch site | Cape Canaveral,LC-36B |
Contractor | International Launch Services(ILS) |
Orbital parameters | |
Reference system | Geocentric orbit[3] |
Regime | Geostationary orbit |
Longitude | 124° East |
Transponders | |
Band | Ku-band: 12 × 36Mhz+ 16 × 27 MHz C-band: 12 x 36 MHz |
Bandwidth | 1296 MHz |
Coverage area | Japan,East Asia,South Asia,Australia, New Zealand,Hawaii |
TWTA power | Ku-band: 4 × 36 MHz 95 watts 8 × 36 MHz 63 watts 16 × 27 MHz 63 watts C-band: 12 x 36 MHz 34 watts |
JCSAT-4was known asJCSAT-Runtil it was sold toIntelsatin 2009 (Intelsat 26). It is ageostationarycommunications satellitedesigned and manufactured byHughes(nowBoeing) on theHS-601satellite bus.It was originally ordered byJSAT Corporation,which later merged into theSKY Perfect JSAT Group.It has a mixedKu-bandandC-bandpayload and was used as an on orbit spare.[4][2]
Satellite description
[edit]The spacecraft was designed and manufactured byHugheson theHS-601satellite bus.It had a launch mass of 3,105 kg (6,845 lb), a dry mass of 1,841 kg (4,059 lb) and a 12-year design life. When stowed for launch, its dimensions were 2.8 m × 4.9 m × 3.8 m (9 ft 2 in × 16 ft 1 in × 12 ft 6 in). With its solar panels fully extended it spanned 26.2 m (86 ft), and its width when its antennas were fully deployed was 7.5 m (25 ft).[4]Its power system generated approximately 5kWof power due to two wings with foursolar panelseach.[5][4]It also had a singleNiH2batterycomposed of 30cellsand a 200Ahcharge.[4]It would serve as on orbit backup for theJSAT fleet.[4]
Its propulsion system was composed of anR-4D-11-300liquid apogee engine(LAE) with a thrust of 490 N (110 lbf). It also used had 12 22 N (4.9 lbf)bipropellantthrustersforstation keepingandattitude control.It included enough propellant fororbit circularizationand 12 years of operation.[4]Its payload is composed of four octagonal antenna fed by twelve 36MHzand sixteen 27 MHz Ku-band plus twelve 27 MHz C-bandtranspondersfor a total bandwidth of 1296 MHz.[5][4]Eight of the 36 MHz and the sixteen 27 MHz Ku-band transponders have aTWTAoutput power of 63 watts, the other four 36 MHz ones have 95 watts. It can configure four 27 MHz transponders into a single 54 MHz with an effective 125 watts.[4]The twelve C-band transponders have 36 MHz bandwidth and 34 watts of power.[4]
History
[edit]In December 1995,JSATordered its fourth satellite fromHughes,and second of theHS-601platform, theJCSAT-4.It was an almost copy of theJCSAT-3,also based on the HS-601, but with more powerful transponders. It would have a mixed Ku-band and C-band payload, a power generation capability of 5000 watts and a 12 year of design life. It was expected to be delivered by early 1997 and be positioned at the 124° Eastlongitude.It would provide telecommunications and television services to Japan, all ofAsia,Hawaiiand Australia and New Zealand.[4][6]
On 25 March 1996,International Launch Services(ILS) announced a contract with JSAT for the launch of JCSAT-4 aboard an Atlas IIAS. At the time it was expected to launch in January 1997 from Cape Canaveral at LC-36A launch pad. This was the second contract of ILS with JSAT after the successful launch ofJCSAT-3in August 1995.[7]
On 18 February 1997 at 01:42:02UTC,andAtlas IIASlaunched from Cape CanaveralLC-36Bwith JCSAT-4 towards ageosynchronous transfer orbit(GTO).[8]After the successful launch, it was renamedJCSAT-R.During its tenure as JCSAT-R it operated on the 124° Eastlongitude.[4]In August, 2008, JSAT was merged into theSKY Perfect JSAT Group.[9]
Intelsat 26
[edit]In late 2009,Intelsatbought JCSAT-R and rechristened itIntelsat 26.[10][4]In March 2010, Intelsat announced an agreement withTürksatfor loaning Intelsat 26 so the latter could keep its orbital rights until a new satellite could be launched.[10]In July 2010, it was positioned at the 50° East longitude with a 3.4°inclination.[11]In January 2013, the inclination had increased to 4.6°.[12]In August 2016, the satellite was positioned at 64.1° East with a 6.97° inclination.[13][3]
References
[edit]- ^ab"Trajectory: JCSAT 4 1997-007A".NASA. 10 February 2021.Retrieved20 March2021.
- ^ab"Intelsat 26".Satbeams.Retrieved26 July2016.
- ^ab"Detailed satellite data for INTELSAT 26 (IS-26) 64.1°E".satellite-calculations.Retrieved11 August2016.
- ^abcdefghijklKrebs, Gunter (21 April 2016)."JCSat 3, 4 (JCSat R) → Intelsat 26".Gunter's Space Page.Retrieved20 July2016.
- ^ab"Hughes Built JCSAT-4 To Boost Services In Pacific Rim".warunasat.14 February 1997. Archived fromthe originalon 22 August 2016.Retrieved11 August2016.
- ^"JSAT Orders New Communications Satellite From Hughes".warunasat.2 February 1996. Archived fromthe originalon 22 August 2016.Retrieved11 August2016.
- ^"Japan Satellite Systems, Inc. Selects Atlas For Launch Of JCSAT 4".warunasat.25 March 1996. Archived fromthe originalon 22 August 2016.Retrieved11 August2016.
- ^"Atlas Successfully Launches Japanese Comm Satellite".warunasat.16 February 1997. Archived fromthe originalon 22 August 2016.Retrieved11 August2016.
- ^"Notice of Merger of Consolidated Subsidiaries"(PDF).SKY Perfect JSAT. 6 August 2008.Retrieved3 August2016.
- ^abde Selding, Peter B. (18 March 2010)."Turksat To Use Borrowed Intelsat Craft as Placeholder".SpaceNews.Retrieved11 August2016.
- ^"Intelsat 26 (50.0E)".warunasat.21 July 2010. Archived fromthe originalon 22 August 2016.Retrieved11 August2016.
- ^"Intelsat 26 (50.0E)".warunasat.27 January 2013. Archived fromthe originalon 22 August 2016.Retrieved11 August2016.
- ^"INTELSAT 26 (JCSAT 4)".N2YO.Retrieved11 August2016.