OrbitNight

NORAD 21949

USA 81

📡 Radar viewIn orbit
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Computing position…
Blue circle: where it is above the horizon now

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From your location

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Its orbit in 3D

Goes round Earth once every 101 minutes, on an orbit tilted 85.0° from the equator, between 793 and 811 km up. Earth is drawn to scale.

Drag to turn · pinch to zoom · it moves live

About USA 81

USA 81 is a satellite from the United States, launched on Apr 25, 1992 from Air Force Western Test Range.

It circles Earth every 101 minutes (14.3 times a day), between 782 and 785 km up, on an orbit tilted 85.0° to the equator, so its path covers latitudes up to 85° north and south.

The map shows where it is right now; the pass list tells you when it next comes over your location.

American SIGINT satellite

Operated by
United States Air Force
Built by
Lockheed Corporation
Mass
1,360 kg

Names and facts: Wikidata (CC0).

Orbit height over the past year

Over the last 18 days its lowest point went from 782 km to 782 km. Sudden rises are engine burns that lift the orbit; slow declines are drag from the thin upper atmosphere.

Lowest point (perigee)Highest point (apogee)
781782783784785786

From Space-Track element sets, one point a day.