Without a telescope
No brightness estimateWe have no brightness estimate for it, so we cannot say how easy it is to see.
Satellites›Amateur radio satellites›MONITOR-4 (RS57S)
MONITOR-4 (RS57S)
MONITOR-4 (RS57S) is an amateur radio satellite from Russia (and the former Soviet Union), launched on June 27, 2023 from Vostochny, Russia. It is in a low orbit, 468 to 480 km above the ground, and goes around the Earth every 94.1 minutes: 15.3 times a day, at 7.63 km/s (27,500 km/h). The orbit is sun-synchronous: it crosses every place at about the same local time of day.
Where MONITOR-4 (RS57S) 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 MONITOR-4 (RS57S)…
MONITOR-4 (RS57S)
Finding MONITOR-4 (RS57S)…
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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)
- 57182
- International designator
- 2023-091S
- Type
- Satellite
- Belongs to
- Russia (and the former Soviet Union)
- Launched
- June 27, 2023
- Launched from
- Vostochny, Russia
- Status
- Operational
- Orbit
- Low Earth orbit, sun-synchronous
- Lowest point
- 468 km
- Highest point
- 480 km
- Tilt to the equator
- 97.5°
- One lap
- 94.1 minutes
- Laps a day
- 15.31
- Speed
- 7.63 km/s
Orbit measured November 13, 2026, from CelesTrak. Heights are above the ground at the equator. Page updated November 14, 2026.
Quick answers
Where is MONITOR-4 (RS57S) right now?
The map on this page shows where MONITOR-4 (RS57S) 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 MONITOR-4 (RS57S)?
Between 468 km at its lowest and 480 km at its highest, above the ground.
How fast does MONITOR-4 (RS57S) go?
About 7.63 km/s, which is 27,500 km/h. One lap of the Earth takes it 94.1 minutes, so it goes around 15.3 times a day.
Can you see MONITOR-4 (RS57S) without a telescope?
No brightness estimate. We have no brightness estimate for it, so we cannot say how easy it is to see.
When was MONITOR-4 (RS57S) launched?
On June 27, 2023, from Vostochny, 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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