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The Tracking and Data Relay Satellite System (TDRSS) is a concept utilizing communication satellite technology to improve and economize the satellite tracking and telemetry operation. Three geosynchronous satellites (one a standby) will track and receive data from satellites for relay to a ground station. The two active satellites will be separated in orbit by at least 130 degrees of longitude. Additional details of this system may be found under TDRSS-A, or in the `Project Plan for TDRSS'. This satellite was to be deployed from STS-51L (Challenger) and was destroyed.

Alternate Names

    Facts in Brief

    Launch Date: 1986-01-28
    Launch Vehicle: Shuttle
    Launch Site: Cape Canaveral, United States
    Mass: 2200 kg
    Nominal Power: 1700 W

    Funding Agency

    • NASA-Office of Tracking and Data Acquisition (United States)


    • Communications

    Additional Information

    Questions and comments about this spacecraft can be directed to: Coordinated Request and User Support Office



    NameRoleOriginal AffiliationE-mail
    Mr. George Q. ClarkProject ManagerNASA Goddard Space Flight Center

    Related Information/Data at NSSDCA

    NSSDCA TDRS page
    STS 51L

    Other Sources of TDRS Information/Data

    TDRS program

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