| Mission type | Communications |
|---|---|
| Operator | Intelsat |
| COSPAR ID | 1973-058A |
| SATCATno. | 06796 |
| Mission duration | 7 years (planned) |
| 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 | August 23, 1973, 22:57:02 (1973-08-23UTC22:57:02Z) UTC[1] |
| Rocket | Atlas SLV-3D Centaur-D1AR |
| Launch site | Cape CanaveralLC-36A |
| Orbital parameters | |
| Reference system | Geocentric[2] |
| Regime | Geostationary[2] |
| Eccentricity | 0.72066[2] |
| Perigee altitude | 597 kilometers (371 mi)[2] |
| Apogee altitude | 36,612 kilometers (22,750 mi)[2] |
| Inclination | 27.5°[2] |
| Period | 655.2 minutes[2] |
| Epoch | August 23, 1973[2] |
| Transponders | |
| Band | 12IEEEC-band |
| Bandwidth | 40 MHz |
Intelsat IV | |
Intelsat IV F-7 was ageostationarycommunication satellite built byHughes, it was owned byIntelsat. The satellite was based on theHS-312 platform and its estimated useful life was seven years.
The Intelsat IV F-7 was part of the Intelsat IV series which consisted of eight communications satellites, launched fromCape Canaveral during the early 1970s, marked the fifth generation ofgeostationary 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£ 1,300 (595 kg) into orbit and were more than 17 feet (5.2 meters) indiameter. All seven satellites exceeded their projected life expectancies and were withdrawn from active duty, the last of which, theIntelsat IV F-1 was retired in October 1987.
The satellite was equipped with 12C-bandtransponders. 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 August 23, 1973, at 23:57:02 UTC, by means of anAtlas-Centaur vehicle from theCape Canaveral Air Force Station,United States. It had a launch mass of 1,414 kg.[3]
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