Contents

TDRS-3

TDRS-3

TDRS-C aboard Discovery
Mission type	Communication
Operator	NASA
COSPAR ID	1988-091B
SATCAT no.	19548 [1]
Mission duration	Planned: 10 years Elapsed: 35 years, 8 months, 16 days
Spacecraft properties
Bus	TDRS
Manufacturer	TRW
Launch mass	2,224.9 kg (4,905 lb)[2]
Dimensions	17.3 × 14.2 m (57 × 47 ft)[2]
Power	1700 watts[2]
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 [3]

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.^[4]

Launch[edit]

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.^[5] TDRS-C was deployed from Discovery around six hours after launch, and was raised to geostationary orbit by means of an Inertial Upper Stage.^[5]

Deployment[edit]

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.^[6] 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.^[7][8] 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.^[7][9] In October 2009, as NASA began decommissioning TDRS-1, TDRS-3 was moved to 49.0° West,^[10] where it remains in storage as of 2020.^[11]

See also[edit]

• List of TDRS satellites

References[edit]

^ "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.

^ "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.

^ "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.