TDRS-4

TDRS-4
TDRS-D being deployed from Discovery
Mission typeCommunication
OperatorNASA
COSPAR ID1989-021B Edit this at Wikidata
SATCAT no.19883
Mission durationPlanned: 10 years
Final: 22 years, 9 months
Spacecraft properties
BusTDRS
ManufacturerTRW
Launch mass2,108 kg (4,647 lb) [1]
Dimensions17.3 × 14.2 m (57 × 47 ft)
Power1700 watts
Start of mission
Launch date13 March 1989, 14:57:00 (1989-03-13UTC14:57) UTC
RocketSpace Shuttle Discovery
STS-29R / IUS
Launch siteKennedy Space Center, LC-39B
ContractorRockwell International
End of mission
DisposalRetired to graveyard
DeclaredDecember 2011
DeactivatedMay 2012 (2012-06)
Orbital parameters
Reference systemGeocentric orbit
RegimeGeostationary orbit
Longitude41.0° West (1988–2005)
46.0° West (2005–2011)
Epoch14 March 1989 [2]

TDRS-4, known before launch as TDRS-D, is an American communications satellite, of first generation, 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.[3]

  1. ^ "UCS Satellite Database". Union of Concerned Scientists. 1 July 2009. Retrieved 9 August 2009.
  2. ^ "NASA – NSSDCA – Spacecraft – Trajectory Details". nssdc.gsfc.nasa.gov. Retrieved 2 May 2018. Public Domain This article incorporates text from this source, which is in the public domain.
  3. ^ Krebs, Gunter. "TDRS 1, 2, 3, 4, 5, 6". Gunter's Space Page. Retrieved 9 August 2009.