USA-4
| Operator | U.S. Air Force |
|---|---|
| COSPAR ID | 1984-091A |
| Spacecraft properties | |
| Manufacturer | Lockheed Martin |
| Launch mass | 700 kg (1,500 lb) |
| Power | 980 W |
| Start of mission | |
| Launch date | 18:03 GMT, 28 August 1984 |
| Rocket | Titan III(34)B |
| Launch site | Vandenberg, SLC-4W |
| Orbital parameters | |
| Periapsis altitude | 287 kilometres (178 mi) |
| Apoapsis altitude | 38,156 kilometres (23,709 mi) |
| Inclination | 63.60º |
| Period | 702.80 min |
USA-4 (BYEMAN codename QUASAR 5) was an American communication relay satellite carrying a Satellite Data System (SDS 5) payload operated by the National Reconnaissance Office and U.S. Air Force. The fifth of seven Quasar missions, it was launched on a Titan IIIB rocket from Vandenberg, SLC-4W in California on August 28, 1984.[1]
Overview
[edit]The QUASAR 5 satellite launched from what was then called the Air Force Western Test Range (AFWTR),[2] now SLC-4W at Vandenberg SFB, for a launch cost of $25.8 million.[3] The satellite was inserted into a highly elliptical 287 × 38,156 km orbit at an inclination of 63.3° (near-Molniya orbit). The apogee was set in the northern hemisphere.
The satellite was equipped with a Satellite Data System (SDS) payload developed by the US Air Force Space and Missile Systems Organization (SAMSO) and acted as a communication relay for transmitting real-time data from US reconnaissance satellites such as KH-9 Hexagon.[4] It was also used for communications to US Air Force aircraft on polar routes. In 1984, the Permanent Representative of the US to the United Nations stated in a report that the spacecraft was engaged with "practical applications and uses of space technology such as weather or communications".[5]

See also
[edit]References
[edit]- ^ "Titan". www.astronautix.com. Astronautix. Retrieved 8 November 2025.
- ^ "Technical details for satellite USA 4". N2YO.com - Real Time Satellite Tracking and Predictions. Retrieved 8 November 2025.
- ^ "Titan 34B - Quasar 5". Space Launch Schedule. 28 August 1984. Retrieved 7 November 2025.
- ^ "Quasar 1, 2, 3, 4, 5, 6, 7 (SDS 1, 2, 3, 4, 5, 6, 7)". Gunter's Space Page. Retrieved 8 November 2025.
- ^ "Information Furnished in Conformity with the Convention on Registration of Objects Launched into Outer Space" (PDF). United Nations Committee on the Peaceful Uses of Outer Space: 2. 21 November 1984. Retrieved 8 November 2025.