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TDRS-3

TDRS-C aboard Discovery
Mission type	Communication
Operator	NASA
COSPAR ID	1988-091B
SATCAT no.	19548
Mission duration	Planned: 10 years Elapsed: 36 years, 2 months, 19 days
Spacecraft properties
Bus	TDRS
Manufacturer	TRW
Launch mass	2,224.9 kg (4,905 lb)
Dimensions	17.3 × 14.2 m (57 × 47 ft)
Power	1700 watts
Start of mission
Launch date	29 September 1988, 15:37:00 (1988-09-29UTC15:37) UTC
Rocket	Space Shuttle Discovery STS-26 / IUS
Launch site	Kennedy Space Center LC-39B
Contractor	Rockwell International
Orbital parameters
Reference system	Geocentric orbit
Regime	Geostationary orbit
Longitude	151° West (1988) 171° West (1988–1990) 174° West (1990–1991) 62° West (1991–1994) 171° West (1994–1995) 85° East (1995–2009) 49° West (2009–)
Epoch	29 September 1988

TDRS-3, known before launch as TDRS-C, 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.

Launch

The TDRS-C satellite was launched aboard Space Shuttle Discovery during the STS-26 mission in 1988; the first Shuttle flight since the Challenger disaster which had resulted in the loss of the previous TDRS satellite, TDRS-B. Discovery launched from Launch Complex 39B at the Kennedy Space Center at 15:37:00 UTC on 29 September 1988. TDRS-C was deployed from Discovery around six hours after launch, and was raised to geostationary orbit by means of an Inertial Upper Stage.

Deployment

The two-stage solid-propellent 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 04:30 UTC on 30 September 1988, it reached apogee, and the second stage fired, placing TDRS-C into geosynchronous orbit. At this point it received its operational designation. Although the TDRS-2 designation had not been assigned, TDRS-C was given the designation TDRS-3 as NASA did not want to reuse the designation which had been intended for the STS-51-L payload. It was briefly placed at a longitude 151° West of the Greenwich Meridian, before being moved to 171.0° West before the end of 1988, from where it provided communications services to spacecraft in Earth orbit, including Space Shuttles. In 1990, it was relocated to 174.0° West, and again in 1991 to 62.0° West. In 1994, it returned to 171.0° West. In June 1995, it was moved to 85.0° East, from where it was used primarily for communications with spacecraft such as the Compton Gamma Ray Observatory and the Hubble Space Telescope. In October 2009, as NASA began decommissioning TDRS-1, TDRS-3 was moved to 49.0° West, where it remains in storage as of 2020.

See also

• List of TDRS satellites

References

1. McDowell, Jonathan. "SATCAT". Jonathan's Space Pages. Retrieved 18 March 2014.
2. ^ "Tracking and Data Relay Satellite (TDRS) Characteristics". NASA. 10 September 2014. Retrieved 28 July 2020.
3. "NASA – NSSDCA – Spacecraft – Trajectory Details". nssdc.gsfc.nasa.gov. Retrieved 2 May 2018. This article incorporates text from this source, which is in the public domain.
4. Krebs, Gunter. "TDRS 1, 2, 3, 4, 5, 6". Gunter's Space Page. Retrieved 8 August 2009.
5. ^ McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 8 August 2009.
6. "Designation". NASA'S Tracking and Data Relay Satellite. NASA. December 1992. Archived from the original on 3 August 2009. This article incorporates text from this source, which is in the public domain.
7. ^ "TDRS 3". TSE. Retrieved 8 August 2009.
8. McDowell, Jonathan. "Index". Geostationary Orbit Catalog. Jonathan's Space Page. Archived from the original on 6 April 2010. Retrieved 8 August 2009.
9. "The TDRS-J satellite". Spaceflight Now. 1 December 2002. Retrieved 8 August 2009.
10. Clark, Stephen (13 October 2009). "NASA retires 'queen' of tracking satellite fleet". Spaceflight Now. Retrieved 18 March 2014.
11. "Tracking and Data Relay Satellite (TDRS) Fleet". NASA. 11 February 2014. Retrieved 18 March 2014. This article incorporates text from this source, which is in the public domain.

v t e Tracking and Data Relay Satellite System
Tracking and data relay satellite List of TDRS satellites
First generation	TDRS-1 TDRS-B TDRS-3 TDRS-4 TDRS-5 TDRS-6 TDRS-7
Second generation	TDRS-8 TDRS-9 TDRS-10
Third generation	TDRS-11 TDRS-12 TDRS-13
Italics denotes launch failure.

• Communications satellites in geostationary orbit
• Spacecraft launched in 1988
• TDRS satellites
• Spacecraft launched by the Space Shuttle