| Mission type | Communications |
|---|---|
| Operator | Intelsat |
| COSPAR ID | 1975-042A [1] |
| SATCAT no. | 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 UTC |
| Rocket | Atlas SLV-3D Centaur-D1A |
| Launch site | Cape Canaveral LC-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 | 12 IEEE C band (NATO G/H-band) |
| Bandwidth | 36 MHz |
Intelsat IV | |
Intelsat IV F-1 was a geostationary communication satellite built by Hughes, it was owned by Intelsat. The satellite was based on the HS-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 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 1,300 lb (595 kg) into orbit and were more than 17 feet (5.2 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 All seven satellites exceeded their projected life expectancies and were withdrawn from active duty, the last of which, the Intelsat IV F-1 was retired in October 1987.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 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.
The satellite was successfully launched into space on May 22, 1975, by means of an Atlas SLV-3D Centaur-D vehicle from the Cape Canaveral Air Force Station in Florida, United States. It had a launch mass of 3,117 lb. [3]
Syncom started as a 1961 NASA program for active geosynchronous communication satellites, all of which were developed and manufactured by the Space and Communications division of Hughes Aircraft Company. Syncom 2, launched in 1963, was the world's first geosynchronous communications satellite. Syncom 3, launched in 1964, was the world's first geostationary satellite.
Intelsat II was a series of four communications satellites operated by Intelsat which were launched in 1966 and 1967. Built by the Hughes Aircraft Company, the Intelsat II series was a follow-up to the Intelsat I series, of which only one satellite was launched.
Intelsat II F-1, also known as Blue Bird was a communications satellite operated by Intelsat. Launched in 1966 it was intended for operations in geostationary orbit over the Pacific Ocean to provide a communications link between Australia and the United States, however a malfunction prevented the satellite from reaching its planned orbit.
Intelsat II F-2, also known as Lani Bird, was a communications satellite operated by Intelsat. Launched in 1967, it was operated in geostationary orbit at a longitude of 174 degrees east until 1969.
Intelsat II F-3, also known as Canary Bird was a communications satellite operated by Intelsat. Launched in 1967 it was operated in geostationary orbit, spending most of its operational life at a longitude of 15 degrees west.
Intelsat II F-4 was a communications satellite operated by Intelsat. Launched in 1967 it was operated in geostationary orbit at a longitude of 176 degrees east and later 166 degrees west.
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.
Intelsat III F-5 was a communications satellite intended to be operated by Intelsat. Launched towards geostationary orbit in 1969 it failed to achieve orbit.
Intelsat IV F-3 was a geostationary communication satellite built by Hughes and owned by Intelsat. The satellite was based on the HS-353 platform and its estimated useful life was 7 years.
Intelsat IV F-4 was a geostationary communication satellite built by Hughes, it was owned by Intelsat. The satellite was based on the HS-312 platform and its estimated useful life was 7 years.
Intelsat IV F-5 was a geostationary communication satellite built by Hughes, it was owned by Intelsat. The satellite was based on the HS-312 platform and its estimated useful life was 7 years.
Intelsat IV F-6 was a geostationary communication satellite built by Hughes, it was owned by Intelsat. The satellite was based on the HS-312 platform and its estimated useful life was 7 years.
Intelsat IV F-7 was a geostationary communication satellite built by Hughes, it was owned by Intelsat. The satellite was based on the HS-312 platform and its estimated useful life was seven years.
Intelsat IV F-8 was a geostationary communication satellite built by Hughes, it was owned by Intelsat. The satellite was based on the HS-312 platform and its estimated useful life was 7 years.
Intelsat IVA F-2 was a geostationary communication satellite built by Hughes, it was owned by Intelsat. The satellite was based on the HS-353 platform and its estimated useful life was 7 years.
Intelsat IVA F-1 was a geostationary communication satellite built by Hughes, it was owned by Intelsat. The satellite was based on the HS-353 platform and its estimated useful life was 7 years.
Intelsat IVA F-4 was a geostationary communication satellite built by Hughes, it was owned by Intelsat. The satellite was based on the HS-353 platform and its estimated useful life was 7 years.
Intelsat IVA F-6 was a geostationary communication satellite built by Hughes, it was owned by Intelsat. The satellite was based on the HS-353 platform and its estimated useful life was 7 years.
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