Without a telescope
Yes, under a dark skyOn a good pass it is a faint star to the naked eye: magnitude +3.2 at its best. City lights hide it.
Satellites›Brightest satellites›COSMOS 2151
COSMOS 2151
COSMOS 2151 is a satellite from Russia (and the former Soviet Union), launched on June 13, 1991 from Plesetsk, Russia. It is in a low orbit, 557 to 572 km above the ground, and goes around the Earth every 95.9 minutes: 15.0 times a day, at 7.58 km/s (27,300 km/h).
Where COSMOS 2151 is right now
The gold ring is its orbit, and the line drops to the point on the ground under it. Inside the white circle it is above the horizon. Drag the globe to turn it, pinch or use the buttons to come closer; the target button brings you back to the satellite. The 2D map shows its path over the ground for the next lap: gold where it is in sunlight, dashed where it is in Earth’s shadow.
Finding COSMOS 2151…
COSMOS 2151
Finding COSMOS 2151…
- Over
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- Position
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- Height
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- Speed
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- Now
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- Your time
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Can you see it?
From where
Its orbit crosses close to both poles, so sooner or later it passes over every place on Earth.
A satellite shows only when your sky is dark and it is still in sunlight: in the hours after dusk and before dawn.
When it passes over you
The app works out its passes over your exact location, alerts you before one, and leads you to it with an arrow in the camera view.
The facts
- Catalogue number (NORAD)
- 21422
- International designator
- 1991-042A
- Type
- Satellite
- Belongs to
- Russia (and the former Soviet Union)
- Launched
- June 13, 1991
- Launched from
- Plesetsk, Russia
- Orbit
- Low Earth orbit
- Lowest point
- 557 km
- Highest point
- 572 km
- Tilt to the equator
- 82.5°
- One lap
- 95.9 minutes
- Laps a day
- 15.01
- Speed
- 7.58 km/s
- At its brightest
- mag +3.2 estimated, overhead
- Standard brightness
- mag +4.5 from 1,000 km, half lit
- Size on radar
- 5.7 m²
Orbit measured November 12, 2026, from CelesTrak. Heights are above the ground at the equator. Page updated November 14, 2026.
Quick answers
Where is COSMOS 2151 right now?
The map on this page shows where COSMOS 2151 is at this moment, the path it will follow over the ground for the next lap, and the part of the Earth it is above the horizon for. It is worked out from the latest tracking data.
How high is COSMOS 2151?
Between 557 km at its lowest and 572 km at its highest, above the ground.
How fast does COSMOS 2151 go?
About 7.58 km/s, which is 27,300 km/h. One lap of the Earth takes it 95.9 minutes, so it goes around 15.0 times a day.
Can you see COSMOS 2151 without a telescope?
Yes, under a dark sky. On a good pass it is a faint star to the naked eye: magnitude +3.2 at its best. City lights hide it.
When was COSMOS 2151 launched?
On June 13, 1991, from Plesetsk, Russia.
With the app
Knowing where it is over the Earth is one thing. The app shows you where it is in your sky.
This page follows the satellite around the planet. The app works out when it passes over you, and leads you to it.
- Every pass over your exact location, for this satellite and 10,000+ more.
- An alert before it rises, so you are outside in time.
- An arrow in the camera view that leads you to the exact spot in the sky.
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