Home›Maneuver Tracker›Close Approaches›COSMOS 2144 ⟷ ARIANE 3 R/B
MediumProximity
RussiaCOSMOS 2144NORAD 21300 · launched May 1991Military payload
9.10kmPredicted miss distance
FranceARIANE 3 R/BNORAD 15562 · launched Feb 1985Rocket body
Final forecastFinal forecast, made 16 min before the pass.
Closest approach4 Nov 202617:08 UTC
Relative speed11.37 km/sat the closest approach
Altitude1,415 kmlow Earth orbit
Last confirmed4 Nov16:52 UTC · final forecast
Track COSMOS 2144Track ARIANE 3 R/BAll approaches
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RU COSMOS 2144 and FR ARIANE 3 R/B were predicted to reach a closest approach of 9.10 km at 2026-11-04 17:08 UTC, at a relative speed of 11.37 km/s. Final forecast, made 16 min before the pass. 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 2144Payload
NORAD 21300
CountryCIS
Launched1991-05-16
OrbitLEO · 1,409 × 1,417 km
COSPAR1991-033B
Maneuver capableUnknown
Profile →Globe →
ARIANE 3 R/BR/B
NORAD 15562
CountryFR
Launched1985-02-08
OrbitMEO · 329 × 26,471 km
COSPAR1985-015C
Maneuver capableNo
Spent rocket stage: uncontrolled, tracked by the public catalogue.
Profile →Globe →

Where This Happens

Altitude context
DEBRIS BELT 700–1000 KM2006001,0001,5002,000 kmTHIS PASS · 1415 KMISS 420Starlink 550

At 1415 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 2144 ⟷ ARIANE 3 R/B
2026-11-04 17:089.10 km Final forecast11.37 km/s1,415 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 Nothing is overwritten: a withdrawn forecast keeps its figure, with the newer check beside it, and the best estimate after the pass is a row of its own.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
4 Nov 09:33 UTC9.10 km Forecast4 Nov 17:08 UTC3 Nov 19:15 UTCRe-check
3 Nov 17:26 UTC9.04 km Forecast4 Nov 17:08 UTC2 Nov 20:25 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
3.55 km11-01 14:42 UTC
COSMOS 2144GLOBALSTAR M092
4.99 km11-01 16:36 UTC
COSMOS 2144GLOBALSTAR M092
8.37 km11-05 16:55 UTC
COSMOS 2144COSMOS 622

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 →