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THEMIS A

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THEMIS A is classified as:


NORAD ID: 30580
Int'l Code: 2007-004A
Perigee: 1,390.3 km
Apogee: 77,978.8 km
Inclination: 9.0 °
Period: 1,639.4 minutes
Semi major axis: 46055 km
RCS: 0.3991 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 30580U 07004A   18263.20698203 -.00000712  00000-0  00000+0 0  9997
2 30580   8.9875 139.5599 8314792 230.3451 353.4222  0.87837482 41113
Source of the keplerian elements: AFSPC