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American communications satellite From Wikipedia, the free encyclopedia
TDRS-6, known before launch as TDRS-F, is an American communications satellite, of first generation, which is operated by NASA as part of the Tracking and Data Relay Satellite System. It was constructed by TRW, and is based on a custom satellite bus which was used for all seven first generation TDRS satellites.[3]
Mission type | Communication |
---|---|
Operator | NASA |
COSPAR ID | 1993-003B |
SATCAT no. | 22314 |
Mission duration | Planned: 10 years Elapsed: 31 years, 7 months, 21 days |
Spacecraft properties | |
Bus | TDRS |
Manufacturer | TRW |
Launch mass | 2,108 kg (4,647 lb)[1] |
Dimensions | 17.3 × 14.2 m (57 × 47 ft) |
Power | 1700 watts |
Start of mission | |
Launch date | 13 January 1993, 13:59:30 UTC |
Rocket | Space Shuttle Endeavour STS-54 / IUS |
Launch site | Kennedy Space Center LC-39B |
Contractor | Rockwell International |
Orbital parameters | |
Reference system | Geocentric |
Regime | Geostationary |
Longitude | 46.0° West (1994–1996) 47.0° West (1996–2005) 174.0° West (2005–) |
Epoch | 14 January 1993 [2] |
TDRS-F was deployed from Space Shuttle Endeavour during the STS-54 mission in 1993. Endeavour was launched from Launch Complex 39B at the Kennedy Space Center, at 13:59:30 UTC on 13 January 1993.[4] TDRS-F was deployed from Endeavour around six hours after launch, and was raised to geosynchronous orbit by means of an Inertial Upper Stage.[4]
The two-stage solid-propellent Inertial Upper Stage made two burns. The first stage burn occurred shortly after deployment from Endeavour, and placed the satellite into a geosynchronous transfer orbit (GTO). At 02:26 UTC on 14 January 1993, it reached apogee, and the second stage fired, placing TDRS-F into geosynchronous orbit.[5] At this point, it received its operational designation, TDRS-6.
In 1994, it was placed at a longitude 46.0° West of the Greenwich Meridian, to serve as an on-orbit spare.[6] In 1996, it was moved to 47.0° West, where it remained until 2005, when it was repositioned to 174.0° West,[6] where, as of August 2009[update], it was used to provide communications with spacecraft in Earth orbit, such as the International Space Station (ISS) and spacecraft bringing astronauts to the ISS.
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