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THEMIS D

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THEMIS D is classified as:


NORAD ID: 30797
Int'l Code: 2007-004D
Perigee: 1,468.3 km
Apogee: 87,941.6 km
Inclination: 4.9 °
Period: 1,914.6 minutes
Semi major axis: 51075 km
RCS: 0.631 m2 (medium)
Launch date: February 17, 2007
Source: United States (US)
Launch site: AIR FORCE EASTERN TEST RANGE (AFETR)

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.
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NASA's NSSDC Master Catalog

Two Line Element Set (TLE):
1 30797U 07004D   18048.82166256 -.00000635 +00000-0 +00000-0 0  9999
2 30797 004.8602 129.2825 8465168 231.2803 019.4332 00.75210507039836
Source of the keplerian elements: AFSPC