Home›Maneuver Tracker›Close Approaches›COSMOS 2144 ⟷ COSMOS 2252
HighProximity
RussiaCOSMOS 2144NORAD 21300 · launched May 1991Military payload
4.55kmPredicted miss distance
RussiaCOSMOS 2252NORAD 22687 · launched Jun 1993Military payload
Final forecastFinal forecast, made 7 min before the pass.
After the passBest estimate, from the orbit data published nearest its time: 4.50 km at 8 Nov 23:19 UTC.
Closest approach8 Nov 202623:19 UTC
Relative speed10.99 km/sat the closest approach
Altitude1,402 kmlow Earth orbit
Last confirmed8 Nov23:12 UTC · final forecast
Track COSMOS 2144Track COSMOS 2252All approaches
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RU COSMOS 2144 and RU COSMOS 2252 were predicted to reach a closest approach of 4.55 km at 2026-11-08 23:19 UTC, at a relative speed of 10.99 km/s. Final forecast, made 7 min before the pass. Best estimate after the pass, from the orbit data published nearest its time: 4.50 km at 8 Nov 23:19 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 mattersBoth objects are catalogued as payloads. Screening continues as new element sets arrive; operators act on their own conjunction data.

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 →
COSMOS 2252Payload
NORAD 22687
CountryCIS
Launched1993-06-24
OrbitLEO · 1,403 × 1,415 km
COSPAR1993-038A
Maneuver capableUnknown
Profile →Globe →

Where This Happens

Altitude context
DEBRIS BELT 700–1000 KM2006001,0001,5002,000 kmTHIS PASS · 1402 KMISS 420Starlink 550

At 1402 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 ⟷ COSMOS 2252
2026-11-08 23:194.55 km Final forecast · after: 4.50 km10.99 km/s1,402 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
13 Nov 18:44 UTC4.50 km Best estimate8 Nov 23:19 UTC9 Nov 07:19 UTCBest estimate
8 Nov 12:32 UTC4.55 km Forecast8 Nov 23:19 UTC8 Nov 06:36 UTCRe-check
8 Nov 10:55 UTC4.55 km Forecast8 Nov 23:19 UTC7 Nov 22:53 UTCRe-check
8 Nov 10:37 UTC6.89 km Forecast8 Nov 23:19 UTC7 Nov 22:53 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
621 m11-10 17:47 UTC
COSMOS 2252SL-8 DEB
2.27 km11-15 00:52 UTC
COSMOS 2144COSMOS 2356
3.41 km11-08 08:38 UTC
COSMOS 2144OPS 6630 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 →