TDRS Credit: Lockheed-Martin |
AKA: Tracking and Data Relay Satellite. Status: Operational 1983. First Launch: 1983-04-04. Last Launch: 1995-07-13. Number: 7 . Gross mass: 2,240 kg (4,930 lb). Span: 17.40 m (57.00 ft).
When first launched, the TDRS satellites were the largest, most sophisticated communications satellites ever built. The seventh vehicle in the series was ordered as a replacement when TDRS-2 was lost in the Challenger accident.
The hexagonal spacecraft and payload modules were 3-axis stabilized. The zero momentum biased control system used reaction wheels and Earth sensors. Two solar arrays provided 2 kW BOL (1.7 kW EOL). These arrays had an area of ~ 29 sq. m and were articulated about one axis. Two 40 Ahr NiCd batteries provided power during eclipse. A hydrazine propulsion system with 24 4.45 N thrusters was used for orbit circularization and orbit maintenance. Spacecraft telemetry and commanding were performed via a Ku-band communications system, with emergency backup provided by an S-band system.
Payload included:
Hughes received a contract on 23 February 1995 for TDRS replacement - $ 481.6 million for 3 HS-601 spacecraft with added Ka band. Last launch was originally set for 2002. Program total cost to 1997 was $ 3.3 billion over 10 years.
STS-26 First shuttle reflight after Challenger disaster. Deployed TDRS 3. |
STS-29 Deployed TDRS 4. |
STS-41-H Planned Department of Defense or TDRS deployment shuttle mission. Cancelled due to IUS failure. |
STS-43 Deployed TDRS 5 satellite. |
STS-51-DA Planned TDRS/IUS deployment shuttle mission. Cancelled due to IUS failure. |
STS-51-E Planned TDRS/IUS deployment shuttle mission. Cancelled due to IUS failure. |
STS-51-L First shuttle launch from pad LC-39B. An O-ring failure in a solid rocket booster led to leaking of hot gases against the external tank; exploded 73 seconds after launch, all seven crew, with no means of escape, were killed when crew cabin hit the ocean. |
STS-54 Deployed TDRSS 6. |
STS-6 First flight of space shuttle Challenger. First space walk of Shuttle program. Deployed Tracking and Data Relay Satellite. |
STS-61-M Planned TDRS/IUS deployment shuttle mission. Cancelled after Challenger disaster. |
STS-70 Deployed TDRS 7. |
TDRS American military communications satellite. Satellite communications network, for use by Shuttle and US military satellites. Communication satellite built by TRW for NASA, USA. Launched 1983 - 1993. |
TDRS 1 Credit: Manufacturer Image |
TDRS 7 Credit: Manufacturer Image |
STS-6 Deployment of the TDRS by STS-6 Challenger Credit: NASA |
STS-6 TDRS satellite over African Rift Valley, Kenya, Africa Credit: NASA |
STS-26 STS-26 Discovery, Orbiter Vehicle (OV) 103, IUS / TDRS-C deployment Credit: NASA |
STS-26 STS-26 Discovery, Orbiter Vehicle (OV) 103, IUS / TDRS-C deployment Credit: NASA |
STS-26 STS-26 Discovery, Orbiter Vehicle (OV) 103, IUS / TDRS-C deployment Credit: NASA |
STS-26 STS-26 Discovery, Orbiter Vehicle (OV) 103, IUS / TDRS-C deployment Credit: NASA |
STS-26 STS-26 Discovery, Orbiter Vehicle (OV) 103, IUS / TDRS-C deployment Credit: NASA |
STS-29 STS-29 IUS with TDRS-D drifts above Earth's surface during post deployment Credit: NASA |
STS-29 STS-29 IUS with TDRS-D after deployment from Discovery, OV-103 Credit: NASA |
Element of satellite communications network, deployed from STS-6 5 April 1983. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Positioned in geosynchronous orbit at 67 deg W in 1983; 41 deg W in 1983-1989; 79 deg W in 1989-1990; 170 deg W in 1990-1993; 85 deg E in 1994-1995; 49 deg W in 1996-on. As of 5 September 2001 located at 49.36 deg W drifting at 0.010 deg E per day. As of 2007 Mar 9 located at 48.98W drifting at 0.029W degrees per day.
NASA communications; 171 deg W; deployed from STS-26 . Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Positioned in geosynchronous orbit at 151 deg W in 1988; 171 deg W in 1989-1990; 174 deg W in 1990-1991; 62 deg W in 1991-1994;171 deg W in 1994-1995; 85 deg E in 1995-1999 As of 26 August 2001 located at 85.17 deg E drifting at 0.007 deg E per day. As of 2007 Mar 10 located at 84.98E drifting at 0.004W degrees per day.
Deployed from STS 29 13 March 1989; NASA communications; 41 deg W. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Positioned in geosynchronous orbit at 41 deg W in 1989-1999 As of 5 September 2001 located at 41.04 deg W drifting at 0.010 deg W per day. As of 2007 Mar 10 located at 45.81W drifting at 0.008W degrees per day.
NASA communications; 174 deg W; deployed from STS-43 8/2/91. Spacecraft engaged in research and exploration of the upper atmosphere or outer space (US Cat B). Positioned in geosynchronous orbit at 174 deg W in 1991-1999 As of 1 September 2001 located at 174.28 deg W drifting at 0.011 deg E per day. As of 2007 Mar 10 located at 171.61W drifting at 0.006W degrees per day.
NASA communications; deployed from STS-54 1/13/93. Spacecraft engaged in research and exploration of the upper atmosphere or outer space (US Cat B). Positioned in geosynchronous orbit at 150 deg W in 1993; 138 deg W in 1993; 46 deg W in 1994-1999 As of 5 September 2001 located at 46.99 deg W drifting at 0.017 deg W per day. As of 2007 Mar 8 located at 173.51W drifting at 0.006E degrees per day.
NASA communications; deployed from STS-70 on 7/13/95. Stationed at 149.8 deg W. Positioned in geosynchronous orbit at 150 deg W in 1995-1996; 171 deg W in 1996-1999 As of 3 September 2001 located at 171.48 deg W drifting at 0.017 deg W per day. As of 2007 Mar 11 located at 150.85W drifting at 0.002E degrees per day.