Home›Maneuver Tracker›Close Approaches›COSMOS 2439 ⟷ COSMOS 736
HighProximity
RussiaCOSMOS 2439NORAD 32956 · launched May 2008Military payload
2.73kmPredicted miss distance
RussiaCOSMOS 736NORAD 7825 · launched May 1975Military payload
Final forecastFinal forecast, made 18 min before the pass.
Closest approach30 Oct 202605:29 UTC
Relative speed1.09 km/sat the closest approach
Altitude1,477 kmlow Earth orbit
Last confirmed30 Oct05:11 UTC · final forecast
Track COSMOS 2439Track COSMOS 736All approaches
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RU COSMOS 2439 and RU COSMOS 736 were predicted to reach a closest approach of 2.73 km at 2026-10-30 05:29 UTC, at a relative speed of 1.09 km/s. Final forecast, made 18 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 2439Payload
NORAD 32956
CountryCIS
Launched2008-05-23
OrbitLEO · 1,477 × 1,511 km
COSPAR2008-025D
Maneuver capableUnknown
Profile →Globe →
COSMOS 736Payload
NORAD 7825
CountryCIS
Launched1975-05-28
OrbitLEO · 1,469 × 1,487 km
COSPAR1975-045E
Maneuver capableUnknown
Profile →Globe →

Where This Happens

Altitude context
DEBRIS BELT 700–1000 KM2006001,0001,5002,000 kmTHIS PASS · 1477 KMISS 420Starlink 550

At 1477 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 2439 ⟷ COSMOS 736
2026-10-30 05:292.73 km Final forecast1.09 km/s1,477 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 Nothing is overwritten: a withdrawn forecast keeps its figure, with the newer check beside it, and the best estimate after the pass is a row of its own.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
29 Oct 21:31 UTC2.73 km Forecast30 Oct 05:29 UTC29 Oct 06:14 UTCRe-check
29 Oct 05:55 UTC2.94 km Forecast30 Oct 05:29 UTC28 Oct 15:50 UTCRe-check
29 Oct 05:35 UTC3.13 km Forecast30 Oct 05:29 UTC28 Oct 15:50 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
1.21 km10-28 22:34 UTC
COSMOS 2439DELTA 1 DEB
2.57 km10-30 18:28 UTC
COSMOS 2439SL-14 DEB
3.36 km10-31 05:46 UTC
COSMOS 2439DELTA 1 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 →

Cite this encounter: Orbital Radar — “COSMOS 2439 ⟷ COSMOS 736: 2.73 km predicted close approach”, https://orbitalradar.com/conjunction/32956-7825 (accessed 2026-10-30).