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HighProximity
RussiaCOSMOS 2191NORAD 21980 · launched Jun 1992Military payload
4.03kmPredicted miss distance
RussiaSL-8 DEBNORAD 21750 · launched Feb 1991Debris
Final forecastFinal forecast, made 10 min before the pass.
After the passBest estimate, from the orbit data published nearest its time: 4.30 km at 3 Nov 16:37 UTC.
Closest approach3 Nov 202616:37 UTC
Relative speed9.98 km/sat the closest approach
Altitude1,494 kmlow Earth orbit
Last confirmed3 Nov16:27 UTC · final forecast
Track COSMOS 2191Track SL-8 DEBAll approaches
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RU COSMOS 2191 and RU SL-8 DEB were predicted to reach a closest approach of 4.03 km at 2026-11-03 16:37 UTC, at a relative speed of 9.98 km/s. Final forecast, made 10 min before the pass. Best estimate after the pass, from the orbit data published nearest its time: 4.30 km at 3 Nov 16:37 UTC. Miss distance and time of closest approach are computed by propagating the latest published orbital elements for both objects, and each pass is re-checked every 20 minutes as new element sets are published. See the Satellite Maneuver Tracker for the live picture and space situational awareness for context.

Why it mattersOne side of this pass cannot maneuver, so any avoidance decision rests with the other operator. Screening continues as new element sets arrive.

The Two Objects

Dossiers from the satellite directory
COSMOS 2191Payload
NORAD 21980
CountryCIS
Launched1992-06-03
OrbitLEO · 1,472 × 1,502 km
COSPAR1992-030E
Maneuver capableUnknown
Profile →Globe →
SL-8 DEBDebris
NORAD 21750
CountryCIS
Launched1991-02-12
OrbitLEO · 1,446 × 1,655 km
COSPAR1991-009CQ
Maneuver capableNo
Uncontrolled debris fragment tracked by the public catalogue. About space debris →
Profile →Globe →

Where This Happens

Altitude context
DEBRIS BELT 700–1000 KM2006001,0001,5002,000 kmTHIS PASS · 1494 KMISS 420Starlink 550

At 1494 km this pass sits in low Earth orbit. Objects here stay up for decades: there is too little atmospheric drag to clean the band naturally. Why crowded bands matter →

History Between This Pair

1 predicted pass under 10 km
Pair history · COSMOS 2191 ⟷ SL-8 DEB
2026-11-03 16:374.03 km Final forecast9.98 km/s1,494 kmShown above

Repeat encounters are common for objects in near-intersecting orbital planes. Each pass is re-screened as fresh element sets arrive; "Final forecast" means the screening still predicted it within 45 minutes of its time, "Not re-confirmed" means later screening stopped finding it.

Forecast Record

Every figure published for the pass shown above, newest first. Nothing is overwritten: a withdrawn forecast keeps its figure, with the newer check beside it, and the best estimate after the pass is a row of its own.
Computed · figure · predicted time · orbit data · by
7 Nov 02:34 UTC4.30 km Best estimate3 Nov 16:37 UTC4 Nov 15:38 UTCBest estimate
3 Nov 09:13 UTC4.03 km Forecast3 Nov 16:37 UTC2 Nov 16:04 UTCRe-check
2 Nov 22:30 UTC3.94 km Forecast3 Nov 16:37 UTC2 Nov 10:00 UTCRe-check
2 Nov 22:19 UTC5.56 km Forecast3 Nov 16:37 UTC2 Nov 10:00 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
2.88 km11-08 15:49 UTC
COSMOS 2191DELTA 1 DEB
4.24 km11-01 18:28 UTC
COSMOS 2191THORAD DELTA 1 DEB
5.60 km11-04 16:01 UTC
COSMOS 2191COSMOS 1823 DEB

How These Numbers Are Computed

Miss distance and TCA come from propagating the latest published orbital elements for both objects and searching for the minimum separation over the screening window. Element sets carry kilometre-scale uncertainty, so figures here describe a close pass, not a collision prediction; a change in either object's published elements re-computes the pass automatically. What is a conjunction? → How conjunction assessment works →