| Mission type | Communications |
|---|---|
| Operator | Intelsat |
| COSPAR ID | 1975-042A[1] |
| SATCATno. | 07815[2] |
| Mission duration | 7 years |
| Spacecraft properties | |
| Bus | HS-312 |
| Manufacturer | Hughes Aircraft |
| Launch mass | 1,414 kilograms (3,117 lb) |
| BOL mass | 730 kilograms (1,610 lb) |
| Start of mission | |
| Launch date | 22 May 1975, 22:04 (1975-05-22UTC22:04Z) UTC |
| Rocket | Atlas SLV-3D Centaur-D1A |
| Launch site | Cape CanaveralLC-36B |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Geostationary |
| Semi-major axis | 42,449.0 kilometers (26,376.6 mi) |
| Perigee altitude | 36,032.3 kilometers (22,389.4 mi) |
| Apogee altitude | 36,124.6 kilometers (22,446.8 mi) |
| Inclination | 14.3° |
| Period | 1,450.7 minutes |
| Epoch | 21 April 2017 |
| Transponders | |
| Band | 12IEEEC band (NATOG/H-band) |
| Bandwidth | 36 MHz |
Intelsat IV ← Intelsat III F-7 (Intelsat III) | |
Intelsat IV F-1 was ageostationarycommunicationsatellite built byHughes, it was owned byIntelsat. The satellite was based on theHS-312 platform and its estimated useful life was 7 years.
The Intelsat IV F-1 was part of the Intelsat IV series which consisted of eight communications satellites, launched fromCape Canaveral during the early 1970s, marked the fifth generation of geostationary communications satellites developed by theHughes Aircraft Company since 1963 with the launch of Syncom II, the world's first synchronous satellite. TheSyncom II was 15 cm high and 28 inches in diameter, weighing 78 pounds in orbit. In contrast, the Intelsat IVs weighed more than 3,000lb (595 kg) into orbit and were 10 feet (3.0 meters) 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 All seven satellites exceeded their projected life expectancies and were withdrawn from active duty, the last of which, the Intelsat IV F-1 was retired in October 1987.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 12C-band transponders. It had 6,000 two-wayrelay 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.
The satellite was successfully launched into space on May 22, 1975, by means of anAtlas SLV-3D Centaur-D vehicle from theCape Canaveral Air Force Station inFlorida,United States. It had a launch mass of 3,117 lb.[3]
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