 Intelsat IVA | |
| Mission type | Communications |
|---|---|
| Operator | Intelsat |
| COSPAR ID | 1975-091A[1] |
| SATCATno. | 08330[2] |
| Mission duration | 7 years design life |
| Spacecraft properties | |
| Bus | HS-353 |
| Manufacturer | Hughes |
| Launch mass | 1,515 kilograms (3,340 lb) |
| BOL mass | 825 kilograms (1,819 lb) |
| Start of mission | |
| Launch date | September 26, 1975, 00:17 (1975-09-26UTC00:17Z) UTC |
| Rocket | Atlas SLV-3D Centaur-D1AR |
| Launch site | Cape CanaveralLC-36B |
| End of mission | |
| Disposal | Decommissioned |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Geostationary |
| Eccentricity | 0.18066 |
| Perigee altitude | 547 kilometres (340 mi) |
| Apogee altitude | 3,603 kilometres (2,239 mi) |
| Inclination | 21.9 degrees |
| Period | 642.6 minutes |
| Epoch | 26 September 1975 |
| Transponders | |
| Band | 20IEEEC-band (NATOG/H-band) |
Intelsat IVA ← Intelsat IV F-8 (Intelsat IV) | |
Intelsat IVA F-1 was ageostationarycommunicationsatellite built byHughes, it was owned byIntelsat. The satellite was based on theHS-353 platform and its estimated useful life was 7 years.
The Intelsat IVA F-1 was part of the Intelsat IVA series which consisted of 6 satellites, of which five were successfully placed into orbit. All five satellites in the series were retired and operated an average of almost 4 years beyond their life expectancies. The satellite antenna allowed coverage from the land masses on both sides of theAtlantic basin with four point beams and had sufficient insulation between the east beams and the western beams that used the same frequencies in the east and west. The separation of the beam by directionalantenna allowed this dual use of the frequency, significantly increasing the capacity of satellite communication within an assigned frequency range. Although the initial requirement Intelsat VAT series was only for the Atlantic service, but also was given special attention during the project to provide service on theIndian Ocean andPacific Ocean.
The satellite had 20 transponders (individual radio transmitters) compared to 12 on board each Intelsat IV satellite. It had a total height of 22 feet 11 inches (6.99 meters) and a diameter of 7 feet 9 inches (2.36 meters). The solar panels, covered with about 17,000 solar cells, provided primary energy of 600 Watts. The weight of the satellite, which had an orbiting life project of 7 years, was about 3,335 pounds (1,513 kg).[3]
The satellite was successfully launched into space on September 26, 1975, by means of anAtlas-Centaur vehicle from theCape Canaveral Air Force Station,United States.[3]
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