Home›Maneuver Tracker›Close Approaches›COSMOS 2611 ⟷ OKEAN 3
HighProximity
RussiaCOSMOS 2611NORAD 68759 · launched Apr 2026Military payload
3.28kmPredicted miss distance
RussiaOKEAN 3NORAD 21397 · launched Jun 1991Payload
Final forecastFinal forecast, made 14 min before the pass.
Closest approach28 Oct 202613:09 UTC
Relative speed4.39 km/sat the closest approach
Altitude548 kmlow Earth orbit
Last confirmed28 Oct12:55 UTC · final forecast
Track COSMOS 2611Track OKEAN 3All approaches
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RU COSMOS 2611 and RU OKEAN 3 were predicted to reach a closest approach of 3.28 km at 2026-10-28 13:09 UTC, at a relative speed of 4.39 km/s. Final forecast, made 14 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 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 2611Payload
NORAD 68759
CountryCIS
Launched2026-04-16
OrbitLEO · 539 × 554 km
COSPAR2026-083G
Maneuver capableUnknown
Profile →Globe →
OKEAN 3Payload
NORAD 21397
CountryCIS
Launched1991-06-04
OrbitLEO · 540 × 558 km
COSPAR1991-039A
Maneuver capableUnknown
Profile →Globe →

Where This Happens

Altitude context
DEBRIS BELT 700–1000 KM2006001,0001,5002,000 kmTHIS PASS · 548 KMISS 420Starlink 550

At 548 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

2 predicted passes under 10 km
Pair history · COSMOS 2611 ⟷ OKEAN 3
2026-10-28 15:334.61 km Final forecast4.37 km/s549 kmView →
2026-10-28 13:093.28 km Final forecast4.39 km/s548 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 Nothing is overwritten: a withdrawn forecast keeps its figure, with the newer check beside it, and the best estimate after the pass is a row of its own.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
28 Oct 11:39 UTC3.28 km Forecast28 Oct 13:09 UTC27 Oct 22:17 UTCRe-check
27 Oct 14:03 UTC3.25 km Forecast28 Oct 13:09 UTC27 Oct 06:21 UTCRe-check
27 Oct 13:43 UTC5.10 km Forecast28 Oct 13:09 UTC27 Oct 06:21 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
1.08 km10-27 08:52 UTC
YAOGAN-30 BCOSMOS 2611
2.94 km10-26 19:37 UTC
COSMOS 2611DMSP 5D-2 F13 DEB
3.30 km10-31 18:22 UTC
COSMOS 2611OBJECT E

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 →

Cite this encounter: Orbital Radar — “COSMOS 2611 ⟷ OKEAN 3: 3.28 km predicted close approach”, https://orbitalradar.com/conjunction/21397-68759 (accessed 2026-10-31).