Ctrl K

© Polaris Intelligence 2026

Privacy Terms Admin

TDRS 4

retired

CommunicationsGEOCOSPAR 1989-021BLaunched 3/13/1989

Mission & Launch

Launch Mission: TDRS-D
Launch Vehicle: Space Shuttle
Launch Date: 3/13/1989
Last Contact: 12/1/2011

Orbit & Mass

Orbit Class: GEO
Altitude: 35,782 km
Inclination: 0.22 deg
Dry Mass: 1,673 kg
Total Mass: 2,245 kg

Payload Classification

Mission Type: Communications
Payload Category: COM
Payload Class: C

Organizations

Operator: NASA Goddard Space Flight Center
Manufacturer: Northrop Grumman

Constellation

Name: TDRS
Active Satellites: 8
Planned Satellites: 8

Registry

COSPAR ID: 1989-021B
UN Registration: ST/SG/SER.E/212