OrbitNight

NORAD 20547

USA 55

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

Time

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Position

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Speed

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Miles per second
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From your location

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Local sidereal time
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Sunlight

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Its orbit in 3D

Goes round Earth once every 93 minutes, on an orbit tilted 94.1° from the equator, between 2,012 and 2,306 km up. Earth is drawn to scale.

Drag to turn · pinch to zoom · it moves live

About USA 55

USA 55 is a satellite from the United States, launched on Apr 5, 1990 from Air Force Western Test Range.

It circles Earth every 93 minutes (15.5 times a day), between 394 and 466 km up, on an orbit tilted 94.1° to the equator, so its path covers latitudes up to 86° north and south.

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

former American military experimental communications satellite

Names and facts: Wikidata (CC0).

Orbit height over the past year

Over the last 17 days its lowest point went from 393 km to 394 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)
400420440460

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