OrbitNight

NORAD 21527

REX

📡 Radar viewIn orbit
Tap to zoom and pan
Computing position…
Blue circle: where it is above the horizon now

Time

Local time
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Position

Latitude
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Longitude
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Altitude
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Speed

Miles per hour
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Kilometers per second
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Miles per second
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From your location

Azimuth
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Elevation
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Right ascension
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Declination
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Local sidereal time
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Sunlight

Day / night
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Its orbit in 3D

Goes round Earth once every 101 minutes, on an orbit tilted 89.5° from the equator, between 774 and 886 km up. Earth is drawn to scale.

Drag to turn · pinch to zoom · it moves live

About REX

REX is a satellite from the United States, launched on Jun 29, 1991 from Air Force Western Test Range.

It circles Earth every 101 minutes (14.2 times a day), between 766 and 861 km up, on an orbit tilted 89.5° to the equator, so its path covers latitudes up to 90° north and south.

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

U.S. military ionospheric research satellite

Operated by
Space Test Program
Built by
Defense Systems, Inc.
Mass
86 kg

Names and facts: Wikidata (CC0).

Orbit height over the past year

Over the last 18 days its lowest point went from 765 km to 766 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)
760780800820840860

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