| 词条 | Inmarsat-4 F3 |
| 释义 |
| name = Inmarsat-4 F3 | image = | image_caption = | mission_type = | operator = Inmarsat | website = | COSPAR_ID = | SATCAT = | mission_duration = | spacecraft_bus = Eurostar E3000 | manufacturer = EADS Astrium | dry_mass = | launch_mass = {{convert|5960|kg|lb}} | power = | launch_date = {{start-date|18 August 2008}} | launch_rocket = Proton-M/Briz-M | launch_site = Baikonur 200/39 | launch_contractor = ILS | entered_service =7 January 2009 | disposal_type = | deactivated = | orbit_epoch = | orbit_reference = Geocentric | orbit_regime = Geostationary | orbit_periapsis = | orbit_apoapsis = | orbit_inclination = | orbit_period = | orbit_longitude = 98° West | orbit_slot = | apsis = gee | trans_band = | trans_frequency = | trans_bandwidth = | trans_capacity = | trans_coverage = | trans_TWTA = | trans_EIRP = | trans_HPBW = }} Inmarsat-4 F3 is a communications I-4 satellite operated by the British satellite operator Inmarsat. It was launched into a geosynchronous orbit at 22:43 GMT on 18 August 2008,[1] by a Proton-M/Briz-M Enhanced carrier rocket. It is currently located at 97.65° West longitude, providing coverage of the Americas.[2] It entered service on 7 January 2009. Like the earlier Inmarsat-4 F1 and F2 satellites, Inmarsat-4 F3 was constructed by EADS Astrium, using a Eurostar E3000 bus. It has a mass of 5,960 kilograms, and is expected to operate for 13 years.[3] It was originally slated for launch using an Atlas V 531, but was transferred to Proton due to a large backlog of Atlas launches. In the United States, Inmarsat ground stations are licensed to operate at 1525-1559 MHz and 1626.5-1660.5 MHz. The 1544-1545 MHz and 1645.5-1646.5 MHz bands are reserved for safety and distress communications.[2] References1. ^{{cite web|url=http://www.ilslaunch.com/news-081908 |title=ILS PROTON SUCCESSFULLY LAUNCHES INMARSAT-4 F3 SATELLITE |date=2008-08-19 |publisher=International Launch Services |accessdate=2009-02-15 |deadurl=yes |archiveurl=https://web.archive.org/web/20080923142147/http://www.ilslaunch.com/news-081908 |archivedate=2008-09-23 |df= }} 2. ^1 {{cite web|url=http://www.fcc.gov/encyclopedia/inmarsat-list|title=Inmarsat List | FCC.gov|date=|website=US Federal Communications Commission|publisher=|accessdate=March 22, 2014|deadurl=yes|archiveurl=https://web.archive.org/web/20140323091955/http://www.fcc.gov/encyclopedia/inmarsat-list|archivedate=March 23, 2014|df=}} 3. ^{{cite web|url=http://space.skyrocket.de/doc_sdat/inmarsat-4.htm|title=Inmarsat-4|last=Krebs|first=Gunter|publisher=Gunter's Space Page|accessdate=2009-02-15}} External links
4 : Spacecraft launched in 2008|Communications satellites in geostationary orbit|Satellites using the Eurostar bus|Inmarsat satellites |
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