TDRS-4
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TDRS-D being deployed from Discovery
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| Mission type | Communication |
|---|---|
| Operator | NASA |
| COSPAR ID | 1989-021B |
| Mission duration | 10 years (design life) 22 years (actual) |
| Spacecraft properties | |
| Manufacturer | TRW |
| Launch mass | 3,180 kilograms (7,010 lb)[1] |
| Start of mission | |
| Launch date | 13 March 1989, 14:57:00 UTC |
| Rocket | Space Shuttle Discovery STS-29R / IUS |
| Launch site | Kennedy LC-39B |
| End of mission | |
| Disposal | Decommissioned |
| Deactivated | December 2011 |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Geostationary |
| Longitude | 41° West (1988-2005) 46° West (2005—2011) |
| Perigee | 35,771 kilometers (22,227 mi) |
| Apogee | 35,805 kilometers (22,248 mi) |
| Inclination | 10.15 degrees |
TDRS-4, known before launch as TDRS-D, is an American communications satellite which was operated by NASA as part of the Tracking and Data Relay Satellite System from 1989 until 2011. It was constructed by TRW, based on a custom satellite bus which was used for all seven of the first generation TDRS satellites.[2]
History
TDRS-D was launched aboard Space Shuttle Discovery during the STS-29R mission in 1989. Discovery launched from Launch Complex 39B at the Kennedy Space Center at 14:57:00 GMT on 13 March 1989.[3] TDRS-D was deployed from Discovery a few hours after launch, and was raised to geostationary orbit by means of an Inertial Upper Stage.[3]
Deployment
The twin-stage solid-propellant Inertial Upper Stage made two burns. The first stage burn occurred shortly after deployment from Discovery, and placed the satellite into a geosynchronous transfer orbit. At 03:30 GMT on 14 March, it reached apogee, and the second stage fired, placing TDRS-D into geosynchronous orbit.[4] At this point it received its operational designation, TDRS-4. It was placed at a longitude 41 degrees west of the Greenwich Meridian,[5][6] from where it provided communications services to spacecraft in Earth orbit, including the Space Shuttle and International Space Station. In 2005, it was relocated to 46° West.[5]
Retirement
TDRS-4 completed its planned mission in November 2011, and was subsequently removed to a disposal orbit 350 kilometres (220 mi) above GEO belt, per International Telecommunications Union (ITU) and United Nations (UN) recommendations, in early December 2011.[7] In May 2012 NASA reported that the orbit-raising manoeuvre had been completed successfully, and the spacecraft had been retired.[8]
References
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Italics denotes launch failures.
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