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HighProximity
RussiaCOSMOS 2008NORAD 19902 · launched Mar 1989Military payload
3.56kmPredicted miss distance
RussiaCOSMOS 1635NORAD 15617 · launched Mar 1985Military payload
Final forecastFinal forecast, made minutes before the pass.
After the passBest estimate, from the orbit data published nearest its time: 3.56 km at 4 Nov 18:39 UTC.
Closest approach4 Nov 202618:39 UTC
Relative speed12.66 km/sat the closest approach
Altitude1,478 kmlow Earth orbit
Last confirmed4 Nov18:38 UTC · final forecast
Track COSMOS 2008Track COSMOS 1635All approaches
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RU COSMOS 2008 and RU COSMOS 1635 were predicted to reach a closest approach of 3.56 km at 2026-11-04 18:39 UTC, at a relative speed of 12.66 km/s. Final forecast, made minutes before the pass. Best estimate after the pass, from the orbit data published nearest its time: 3.56 km at 4 Nov 18:39 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 2008Payload
NORAD 19902
CountryCIS
Launched1989-03-24
OrbitLEO · 1,393 × 1,470 km
COSPAR1989-025A
Maneuver capableUnknown
Profile →Globe →
COSMOS 1635Payload
NORAD 15617
CountryCIS
Launched1985-03-21
OrbitLEO · 1,473 × 1,513 km
COSPAR1985-023A
Maneuver capableUnknown
Profile →Globe →

Where This Happens

Altitude context
DEBRIS BELT 700–1000 KM2006001,0001,5002,000 kmTHIS PASS · 1478 KMISS 420Starlink 550

At 1478 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 2008 ⟷ COSMOS 1635
2026-11-04 18:393.56 km Final forecast12.66 km/s1,478 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
8 Nov 14:52 UTC3.56 km Best estimate4 Nov 18:39 UTC4 Nov 19:20 UTCBest estimate
4 Nov 17:58 UTC3.56 km Forecast4 Nov 18:39 UTC4 Nov 09:26 UTCRe-check
4 Nov 09:33 UTC3.57 km Forecast4 Nov 18:39 UTC4 Nov 02:59 UTCRe-check
3 Nov 21:15 UTC3.57 km Forecast4 Nov 18:39 UTC3 Nov 15:59 UTCRe-check
3 Nov 20:55 UTC9.11 km Forecast4 Nov 18:39 UTC3 Nov 15:59 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
1.78 km11-03 02:03 UTC
COSMOS 2008COSMOS 1798
4.22 km11-09 05:39 UTC
COSMOS 2008COSMOS 2125
5.71 km11-07 05:59 UTC
COSMOS 2008COSMOS 878

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 →