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    THEMIS D can be found in the following categories:
    Space & Earth Science

    NORAD ID: 30797
    Int'l Code: 2007-004D
    Perigee: 825.8 km
    Apogee: 70,674.3 km
    Inclination: 8.2 °
    Period: 1,434.2 minutes
    Semi major axis: 42128 km
    Launch date: February 17, 2007
    Source: United States (US)
    Comments: Aiming to uncover the physics that power the auroras that crown Earth's poles, five tiny probes have been launched into space for a synchronized orbital dance to locate where the trigger is pulled to create the eerily magnificent displays. Each of the 282-pound spacecraft is equipped with identical suites of instruments to examine the origin of space explosions known as substorms. The events start with the soup of ionized particles from the sun, called the solar wind, buffeting the Earth at a million miles per hour. Some of that energy gets trapped in the magnetic field, causing the field lines to stretch back in the direction opposite the sun like rubberbands. But when stretched too far the lines snap, releasing the energy that generates shimmering auroral displays.

    Two Line Element Set (TLE):

    1 30797U 07004D   15108.60896740 -.00002308  00000-0 -32387+0 0  9999
    2 30797 008.2353 308.9177 8289998 278.2360 001.9122 01.00402406 29558
    Source: AFSPC

    NASA's NSSDC Master Catalog entry for THEMIS D

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