Intelsat IV F-2
{{Short description|Geostationary communication satellite launched in 1971}}
{{Use American English|date=April 2017}}
{{Infobox spaceflight
| name = Intelsat IV F-2
| image =
| image_size =
| image_caption =
| mission_type = Communications
| operator = Intelsat
| website =
| COSPAR_ID = 1971-006A
| SATCAT = 04881
| mission_duration = 7 years (planned)
| spacecraft_bus = HS-312
| spacecraft_type =
| manufacturer = Hughes Aircraft
| BOL_mass = {{convert|730|kg|lb}}
| launch_mass = {{convert|1414|kg|lb}}
| dimensions =
| power =
| launch_date = {{start-date|January 26, 1971, 00:36:03|timezone=yes}} UTC{{cite web|url=http://planet4589.org/space/log/launchlog.txt|title=Launch Log|first=Jonathan|last=McDowell|work=Jonathan's Space Page|access-date=April 22, 2017}}
| launch_rocket = Atlas SLV-3C Centaur-D
| launch_site = Cape Canaveral LC-36A
| launch_contractor =
| disposal_type =
| deactivated =
| orbit_epoch = January 26, 1971{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1971-006A|title=INTELSAT 4 F-2|first=Goddard Space Flight Center|last=NASA|work=NSSDC Master Catalog|access-date=April 22, 2017}}
| orbit_reference = Geocentric
| orbit_regime = Geostationary
| orbit_periapsis = {{convert|35,801|km|mi|sp=us}}
| orbit_apoapsis = {{convert|36,349|km|mi|sp=us}}
| orbit_eccentricity = 0.00645
| orbit_period = 1,450.8 minutes
| orbit_longitude =
| apsis = gee
| trans_frequency =
| trans_bandwidth = 40 MHz
| trans_capacity =
| trans_coverage =
| trans_TWTA =
| trans_EIRP =
| trans_HPBW =
| programme = Intelsat IV
| previous_mission = Intelsat IV F-1
| next_mission = Intelsat IV F-3
}}
Intelsat IV F-2 was a geostationary communication satellite built by Hughes and owned by Intelsat. The satellite was based on the HS-312 platform and its estimated useful life was 7 years.
History
The Intelsat IV F-2 was part of the Intelsat IV series which consisted of eight communications satellites, launched from Cape Canaveral during the early 1970s, marked the fifth generation of geostationary communications satellites developed by the Hughes Aircraft Company since 1963 with the launch of Syncom II, the world's first synchronous satellite. The Syncom II was 15 cm high and 28 inches in diameter, weighing 78 pounds in orbit. In contrast, the Intelsat IVs weighed more than {{convert|1,300|lb|kg}} into orbit and were more than {{convert|17|ft|m|abbr=off|sp=us}} in diameter. All seven satellites exceeded their projected life expectancies and were withdrawn from active duty, the last of which, the Intelsat IV F-1 was retired in October 1987.
The satellite was equipped with 12 C-band transponders. It had 6,000 two-way relay phone calls or broadcast 12 concurrent color television programs or mixed combinations of communications traffic including data and fax.
The satellite had 12 channels of broadband communication. Each channel had a bandwidth of 40 MHz and provided about 500 communication circuits.
Launch
The satellite was successfully launched into space on January 26, 1971, by means of an Atlas SLV-3C Centaur-D vehicle from the Cape Canaveral Air Force Station in Florida, United States. It had a launch mass of 1,414 kg.Krebs, Gunter. [http://space.skyrocket.de/doc_sdat/intelsat-4a.htm Intelsat-4A]. Gunter's Space Page. Retrieved 22 April 2017.
See also
{{Portal|Spaceflight}}
References
{{reflist|2}}
{{Intelsat}}
{{Orbital launches in 1971}}
Category:Spacecraft launched in 1971
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