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QZS-4, which will be known as Michibiki No.4 once in orbit, is the fourth member of the Quasi-Zenith Satellite System (QZSS), a constellation of satellites which Japan is launching to improve the accuracy of satellite navigation in its densely-populated cities.

QZS broadcasts additional signals compatible with the US Air Force’s Global Positioning System (GPS), providing additional points of reference that a QZS-enabled receiver can use to triangulate its position.

Alternate Names

    Facts in Brief

    Launch Date: 2017-10-09
    Launch Vehicle: H-2A
    Launch Site: Tanegashima, Japan
    Mass: 4000 kg

    Funding Agency

    • Japan Aerospace Exploration Agency (Japan)


    • Navigation/Global Positioning

    Additional Information

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

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