Home›Maneuver Tracker›Close Approaches›COSMOS 2008 ⟷ COSMOS 343
HighProximity
RussiaCOSMOS 2008NORAD 19902 · launched Mar 1989Military payload
3.53kmPredicted miss distance
RussiaCOSMOS 343NORAD 4390 · launched Apr 1970Military payload
Final forecastFinal forecast, made 8 min before the pass.
Closest approach29 Oct 202620:39 UTC
Relative speed2.56 km/sat the closest approach
Altitude1,393 kmlow Earth orbit
Last confirmed29 Oct20:31 UTC · final forecast
Track COSMOS 2008Track COSMOS 343All approaches
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RU COSMOS 2008 and RU COSMOS 343 were predicted to reach a closest approach of 3.53 km at 2026-10-29 20:39 UTC, at a relative speed of 2.56 km/s. Final forecast, made 8 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 2008Payload
NORAD 19902
CountryCIS
Launched1989-03-24
OrbitLEO · 1,393 × 1,470 km
COSPAR1989-025A
Maneuver capableUnknown
Profile →Globe →
COSMOS 343Payload
NORAD 4390
CountryCIS
Launched1970-04-25
OrbitLEO · 1,375 × 1,467 km
COSPAR1970-036H
Maneuver capableUnknown
Profile →Globe →

Where This Happens

Altitude context
DEBRIS BELT 700–1000 KM2006001,0001,5002,000 kmTHIS PASS · 1393 KMISS 420Starlink 550

At 1393 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 343
2026-10-29 20:393.53 km Final forecast2.56 km/s1,393 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 Nothing is overwritten: a withdrawn forecast keeps its figure, with the newer check beside it, and the best estimate after the pass is a row of its own.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 00:15 UTC3.53 km Forecast29 Oct 20:39 UTC28 Oct 14:37 UTCRe-check
28 Oct 21:15 UTC3.54 km Forecast29 Oct 20:39 UTC27 Oct 22:49 UTCRe-check
28 Oct 20:55 UTC3.88 km Forecast29 Oct 20:39 UTC27 Oct 22:49 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
2.31 km10-27 05:45 UTC
COSMOS 2197COSMOS 343
3.38 km10-27 12:39 UTC
COSMOS 2008COSMOS 2129
6.53 km10-24 15:35 UTC
COSMOS 2008NOAA 1

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 2008 ⟷ COSMOS 343: 3.53 km predicted close approach”, https://orbitalradar.com/conjunction/19902-4390 (accessed 2026-10-30).