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GOES-G is the ninth in a series of NASA-developed, NOAA-operated, geosychronous and operational spacecraft. The spin-stabilized spacecraft carries: (1) a visible infrared spin-scan radiometer (VISSR) atmospheric sounder (VAS) to provide high-quality day/night cloudcover data, to take radiance derived temperatures of the earth/atmosphere system, and to determine atmospheric temperature and water vapor content at various levels; (2) a meteorological data collection system to relay processed data from central weather facilities to regional stations equipped with APT and to collect and retransmit data from remotely located earth-based platforms; and (3) a space environment monitor (SEM) system to measure proton, electron, and solar X-ray fluxes and magnetic fields. The cylindrically shaped spacecraft measures 190.5 cm in diameter and 230 cm in length, exclusive of a magnetometer that extends an additional 83 cm beyond the cylindrical shell. The primary structural members are a honeycombed equipment shelf and a thrust tube. The VISSR telescope is mounted on the equipment shelf and views the earth through a special aperture in the side of the spacecraft. A support structure extends radially from the thrust tube and is affixed to the solar panels, which form the outer wall of the spacecraft to provide the primary source of electrical power. Located in the annulus-shaped space between the thrust tube and the solar panels are stationkeeping and dynamics control equipment, batteries, and most of the SEM equipment. Proper spacecraft attitude and spin rate (approximately 100 rpm) are maintained by two separate sets of jet thrusters mounted around the spacecraft equator and activated by ground command. The spacecraft uses both UHF-band and S-band frequencies in its telemetry and command subsystem. A low-power VHF transponder provides telemetry and command during launch and then serves as a backup for the primary subsystem once the spacecraft attains synchronous orbit.

Alternate Names

    Facts in Brief

    Launch Date: 1986-05-03
    Launch Vehicle: Delta
    Launch Site: Cape Canaveral, United States
    Mass: 840 kg

    Funding Agencies

    • NASA-Office of Space Science Applications (United States)
    • NOAA National Environmental Satellite Service (United States)


    • Communications
    • Space Physics
    • Solar Physics
    • Earth Science

    Additional Information

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



    NameRoleOriginal AffiliationE-mail
    Mr. James R. GreavesProgram ManagerNASA
    Mr. Robert H. PickardProject ManagerNASA Goddard Space Flight Center
    Mr. William E. ShenkProject ScientistNASA Goddard Space Flight Center
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