| 词条 | Apstar 7 |
| 释义 |
| name = Apstar 7 | image = | image_caption = | mission_type = Communication | operator = APT Satellite | website = {{url|http://www.apstar.com/en/apstar-fleet/apstar-7/}} | COSPAR_ID = 2012-013A | SATCAT = 38107 | mission_duration = 15 years[1] | spacecraft_bus = Spacebus-4000C2 | manufacturer = Thales Alenia Space | dry_mass = | launch_mass = {{convert|5054|kg}}[1] | power = | launch_date = {{start-date|31 March 2012, 10:27|timezone=yes}} UTC | launch_rocket = Chang Zheng 3B/E | launch_site = Xichang LC-2 | launch_contractor = | entered_service = | disposal_type = | deactivated = | orbit_epoch = 19 December 2013, 16:37:15 UTC[1] | orbit_reference = Geocentric | orbit_regime = Geostationary | orbit_periapsis = {{convert|35784|km|mi}} | orbit_apoapsis = {{convert|35802|km|mi}} | orbit_inclination = 0.04 degrees | orbit_period = 23.93 hours | orbit_longitude = 76.5° East[1] | orbit_slot = | apsis = gee | trans_band = | trans_frequency = | trans_bandwidth = | trans_capacity = | trans_coverage = | trans_TWTA = | trans_EIRP = | trans_HPBW = }}Apstar-7 is a Chinese communications satellite which is operated by APT Satellite as part of the Apstar system. It was launched in 2012 as a replacement for the Apstar 2R satellite launched in 1997.[2] Apstar-7 was constructed by Thales Alenia Space, and is based on the Spacebus-4000C2 satellite bus. The satellite had a mass at launch of {{convert|5054|kg}}, and is expected to operate for at least 15 years.[3] It is positioned in geostationary orbit at a longitude of 76.5 degrees East, and carries 56 transponders with an operating power of 8.4 kilowatts;[3] 28 operating in the C band and providing services to Asia, Africa, eastern and central Europe and Australia and the other 28 operating in the {{Ku band}}, covering Africa, the Middle East, the People's Republic of China, and Taiwan.[4] The satellite's solar arrays generate 11.4 kilowatts of power. Apstar-7 was launched by a Long March 3B/E carrier rocket, flying from Launch Complex 2 at the Xichang Satellite Launch Centre. Liftoff took place at 10:27 UTC on 31 March 2012, with the rocket placing the satellite into a supersynchronous transfer orbit.[5] Operational historyThales Alenia Space built Apstar-7 as an ITAR-free satellite, containing no restricted American components.[6] The United States prohibits the export of satellite components when a Chinese launcher will be used. Ironically, the US Department of Defense leased bandwidth on Apstar-7 in May 2012 to improve communications with the U.S. Africa Command.[7] In 2013, Thales Alenia was forced to discontinue its ITAR-free satellite line after US supplier Aeroflex admitted that it had sold them ITAR-controlled components.[8]See also{{Portal|Spaceflight}}
References1. ^{{cite web|url=http://www.n2yo.com/satellite/?s=38107|title=APSTAR 7 Satellite details 2012-013A NORAD 38107|work=N2YO|date=19 December 2013|accessdate=20 December 2013}} 2. ^{{cite web|url=http://www.nasaspaceflight.com/2012/03/chinese-long-march-3be-launches-apstar-7/|title=Chinese Long March 3B/E launches Apstar-7|date=31 March 2012|first=Rui C.|last=Barbosa|publisher=NASASpaceflight.com|accessdate=4 May 2012}} 3. ^1 2 3 4 {{cite web|url=http://space.skyrocket.de/doc_sdat/apstar-7.htm|title=APStar 7, 7B|work=Gunter's Space Page|first=Gunter|last=Krebs|accessdate=4 May 2012}} 4. ^{{cite web|url=http://www.apstar.com/apt_apstar/basic.asp |archive-url=https://web.archive.org/web/20120505023400/http://www.apstar.com/apt_apstar/basic.asp |dead-url=yes |archive-date=5 May 2012 |title=APSTAR-7 system characteristics |publisher=APT Satellite Holdings |accessdate=4 May 2012 }} 5. ^{{cite web|url=http://planet4589.org/space/jsr/back/news.656|title=Issue 656|first=Jonathan|last=McDowell|work=Jonathan's Space Report|date=12 April 2012|accessdate=4 May 2012}} 6. ^{{cite news|last=Clark|first=Stephen|title=Chinese rocket lifts off with communications satellite|url=http://www.spaceflightnow.com/news/n1203/31longmarch/|newspaper=Spaceflight Now|date=31 March 2012}} 7. ^{{cite news|last=Capaccio|first=Tony|title=Pentagon Using China Satellite for U.S.-Africa Command|url=https://www.bloomberg.com/news/2013-04-29/pentagon-using-china-satellite-for-u-s-africa-command.html|accessdate=29 April 2013|newspaper=Bloomberg|date=29 April 2013}} 8. ^{{cite news|last1=Ferster|first1=Warren|title=U.S. Satellite Component Maker Fined $8 Million for ITAR Violations|url=http://spacenews.com/37071us-satellite-component-maker-fined-8-million-for-itar-violations/|work=SpaceNews|date=5 September 2013}} External links
4 : Spacecraft launched in 2012|Communications satellites of China|Satellites using the Spacebus bus|2012 in China |
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