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Polar

Catalogued as POLAR

Magnetospheric Research · NASA

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NASA's Polar satellite spent over a decade studying Earth's magnetosphere — the invisible force field that shields life from solar radiation. Launched in 1996 into a highly elliptical orbit that carried it from 3,100 miles to over 31,000 miles altitude, it captured the first full ultraviolet images of Earth's auroral ovals and revealed how the solar wind punches through our magnetic defenses.

Its orbit

Orbit
Highly Ellipticalswings far out, then dives back close to Earth
Altitude
3,628–32,559 mi (5,839–52,398 km)
Inclination
80.0°
One orbit
18.5 hours1.3 orbits a day
NORAD ID
23802
Int’l designator
1996-013A
Launched
1996

Orbital elements from CelesTrak, as of 20 Sep 2026.

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