| 词条 | JCSAT-2 |
| 释义 |
| name = JCSAT-2 | names_list = | image = | image_caption = | image_alt = | image_size = | mission_type = Communication | operator = JSAT Corporation | Harvard_designation = | COSPAR_ID = 1990-001B[1] | SATCAT = 20402 | website = | mission_duration = | spacecraft = JCSAT-2 | spacecraft_type = | spacecraft_bus = HS-393 | manufacturer = Hughes | launch_mass = {{convert|2280|kg|abbr=on}} | BOL_mass = {{convert|1364|kg|abbr=on}} | landing_mass = | dry_mass = | payload_mass = | dimensions = {{convert|3.7|x|10|x|2.3|m|abbr=on}} with solar panels and antennas deployed. | power = 2.2 kW | launch_date = {{start date|1990|01|01|00|07|00|7=Z}}[2] | launch_rocket = Commercial Titan III | launch_site = Cape Canaveral LC-40 | launch_contractor = Martin Marietta | deployment_from = | deployment_date = | entered_service = | disposal_type = placed in a graveyard orbit | deactivated = 2002[3] | destroyed = | last_contact = | recovery_by = | recovery_date = | decay_date = | landing_date = | landing_site =
| programme = JSAT | previous_mission = JCSAT-1 | next_mission = JCSAT-3 | insignia = | insignia_caption = | insignia_alt = | insignia_size = }}JCSAT-2 was a geostationary communications satellite designed and manufactured by Hughes (now Boeing) on the HS-393 platform. 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°E longitude until it was replaced by JCSAT-2A.[5] Satellite descriptionThe spacecraft was designed and manufactured by Hughes on the HS-393 satellite bus. It had a launch mass of {{convert|2280|kg|abbr=on}}, a mass of {{convert|1364|kg|abbr=on}} after reaching geostationary orbit and an 8-year design life. When stowed for launch, its dimensions were {{convert|3.4|m|abbr=on}} long and {{convert|3.7|m|abbr=on}} in diameter. With its solar panels fully extended it spanned {{convert|10|m|abbr=on}}.[5] Its power system generated approximately 2,350 Watts of power thanks to two cylindrical solar panels.[5] It also had a two 38Ah NiH2 batteries.[5] It would serve as the main satellite on the 150°E longitude position of the JSAT fleet.[5] Its propulsion system was composed of two R-4D LAE with a thrust of {{convert|490|N|abbr=on}}. It also used two axial and four radial {{convert|22|N|abbr=on}} bipropellant thrusters for station keeping and attitude control. It included enough propellant for orbit circularization and 8 years of operation.[5] Its payload was composed of a {{convert|2.4|m|abbr=on}} antenna fed by thirty-two 27 MHz Ku band transponders for a total bandwidth of 864 MHz.[5] The Ku band transponders had a TWTA output power of 20 Watts.[5] HistoryWith the opening of the Japanese satellite communications market to private investment, Japan Communications Satellite Company (JCSAT) was founded in 1985.[16][17] On June of the same year, JCSAT awarded an order to Hughes Space and Communications for two identical satellites, JCSAT-1 and JCSAT-2, based on the spin-stabilized HS-393 satellite bus.[5] JCSAT-2 was successfully launched aboard a Commercial Titan III along Skynet 4A on January 1, 1990 at 00:07 UTC.[1][5] Originally expected to be retired in 2000, it was finally sent to a graveyard orbit on 2002.[3] References1. ^1 {{cite web |url=http://www.globalsecurity.org/space/world/japan/jcsat.htm |title=JCSAT |publisher=Global Security |access-date=2016-08-04}} [1][2][3][4][5][6][7]2. ^1 2 3 4 5 6 7 8 9 10 11 {{cite web |last1=Krebs |first1=Gunter Dirk |title=JCSat 1, 2 |url=http://space.skyrocket.de/doc_sdat/jcsat-1.htm |website=Gunter's Space Page |access-date=2016-07-20 |date=2016-04-21}} 3. ^1 2 {{cite web |url=http://www.jsforum.or.jp/stableuse/pdf/19.%20yanagisawa.pdf |title=Lightcurve observations of LEO objects in JAXA |last=Yanagisawa |first=Toshifumi |publisher=JAXA |date=2016-03-09 |access-date=2016-08-16}} 4. ^1 2 {{cite web |url=http://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=1990-001B |title=JCSAT 2 |publisher=NASA Space Science Data Coordinated Archive |date=27 April 2016 |access-date=2016-08-04}} 5. ^1 {{cite web |url=http://nssdc.gsfc.nasa.gov/nmc/spacecraftOrbit.do?id=1990-001B |title=JCSAT 2 |publisher=NASA Space Science Data Coordinated Archive |date=27 April 2016 |access-date=2016-08-04}} 6. ^1 {{cite web |url=http://www.n2yo.com/?s=20402 |title=JCSAT 2 |publisher=n2yo.com |access-date=2016-08-16}} 7. ^1 {{cite web |url=http://www.skyperfectjsat.co.jp/en/about/history.html |title=History |publisher=SKY Perfect JSAT Holdings Inc. |access-date=2016-07-28}} }}{{Portal|Spaceflight}}{{JCSAT}}{{Orbital launches in 1990}} 5 : Communications satellites in geostationary orbit|Spacecraft launched in 1990|Satellites using the HS-393 bus|Communications satellites of Japan|Satellites of Japan |
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