| 词条 | Ekspress AM4R |
| 释义 |
| name = Ekspress AM4R | image = | image_caption = | mission_type = Communications | operator = RSCC | mission_duration = 15 years (planned) Failed to orbit | spacecraft_bus = Eurostar 3000 | manufacturer = Airbus Defence and Space | launch_mass = {{convert|5775|kg}}[1] | dimensions = | power = | launch_date = {{start-date|15 May 2014, 21:42|timezone=yes}} UTC[2] | launch_rocket = Proton-M/Briz-M | launch_site = Baikonur 200/39 | launch_contractor = Khrunichev | orbit_epoch = Planned | orbit_reference = Geocentric | orbit_regime = Geosynchronous planned Failed to orbit | orbit_periapsis = | orbit_apoapsis = | orbit_inclination = 0 degrees | orbit_period = 24 hours | orbit_longitude = 80° East | apsis = gee | trans_band = 30 C band 28 {{Ku band}} 2 {{Ka band}} 3 L band | trans_frequency = | trans_bandwidth = | trans_capacity = | trans_coverage = | trans_TWTA = | trans_EIRP = | trans_HPBW = }}Ekspress AM4R ({{lang-ru|Экспресс-АМ4Р}} meaning Express AM4R)[1] was a Russian communications satellite intended for operation by the State Company for Satellite Communications. Constructed as a replacement for Ekspress AM4, which was left unusable after the upper stage of the rocket carrying it malfunctioned, Ekspress AM4R was also lost due to a launch failure.[2]Astrium, which had become part of Airbus Defence and Space by the time of the satellite's launch, constructed Ekspress AM4R, which was based on the Eurostar 3000 satellite bus.[3] It was identical in design to Ekspress AM4, with a mass of {{convert|5775|kg}} and a planned operational lifespan of fifteen years. The satellite carried sixty-three transponders: thirty operating in the C band of the electromagnetic spectrum, twenty eight in the Ku band, two in the Ka band and three in the L band. It was to have been the largest and most powerful satellite in the Ekspress constellation.[4]Khrunichev was contracted to launch Ekspress AM4R, using a Proton-M/Briz-M rocket - the same configuration that had failed to deploy Ekspress AM4. The launch took place from Site 200/39 at the Baikonur Cosmodrome, at 21:42 UTC on 15 May 2014. Shortly after launch the rocket was reported to have encountered a problem during third stage flight, and as a result the satellite failed to reach orbit.[5] References1. ^{{cite web|url=http://ria.ru/space/20140228/997566018.html|title=Ракета "Протон-М" для запуска "Экспресс-АМ4Р" доставлена на Байконур|publisher=RIA Novosti|date=28 February 2014|accessdate=26 May 2014}} {{Portal|Spaceflight}}{{Ekspress}}{{Orbital launches in 2014}}{{Use British English|date=May 2014}}{{Use dmy dates|date=May 2014}}{{Russia-spacecraft-stub}}2. ^{{cite web|url=http://www.russianspaceweb.com/ekspress_am4r.html |title=Proton fails again with Ekspress satellite |first=Anatoly |last=Zak |accessdate=26 May 2014 |deadurl=yes |archiveurl=https://web.archive.org/web/20140527214354/http://www.russianspaceweb.com/ekspress_am4r.html |archivedate=27 May 2014 |df=dmy }} 3. ^{{cite web|url=http://www.astrium.eads.net/en/programme/express-am4r-and-express-am7.html|title=Express AM4R and Express AM7|publisher=Astrium|accessdate=26 May 2014}} 4. ^1 {{cite web|last=Krebs|first=Gunter|title=Ekspress-AM 4, 4R|url=http://space.skyrocket.de/doc_sdat/ekspress-am-4.htm|work=Gunter's Space Page|accessdate=26 May 2014}} 5. ^1 {{cite web|url=http://www.nasaspaceflight.com/2014/05/russian-proton-m-launches-with-ekspress-am4r/|title=Russian Proton-M suffers failure during Ekspress-AM4R launch|first1=William|last1=Graham|first2=Chris|last2=Bergin|publisher=NASASpaceflight.com|date=15 May 2014|accessdate=26 May 2014}} 5 : Spacecraft launched in 2014|Satellite launch failures|Ekspress satellites|2014 in Russia|Satellites using the Eurostar bus |
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