Home›Maneuver Tracker›Close Approaches›COSMOS 2439 ⟷ SL-14 DEB
HighProximity
RussiaCOSMOS 2439NORAD 32956 · launched May 2008Military payload
2.57kmPredicted miss distance
RussiaSL-14 DEBNORAD 19174 · launched Oct 1978Debris
Final forecastFinal forecast, made 16 min before the pass.
Closest approach30 Oct 202618:28 UTC
Relative speed3.11 km/sat the closest approach
Altitude1,507 kmlow Earth orbit
Last confirmed30 Oct18:12 UTC · final forecast
Track COSMOS 2439Track SL-14 DEBAll approaches
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RU COSMOS 2439 and RU SL-14 DEB were predicted to reach a closest approach of 2.57 km at 2026-10-30 18:28 UTC, at a relative speed of 3.11 km/s. Final forecast, made 16 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 mattersOne side of this pass cannot maneuver, so any avoidance decision rests with the other operator. Screening continues as new element sets arrive.

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 →
SL-14 DEBDebris
NORAD 19174
CountryCIS
Launched1978-10-26
OrbitLEO · 1,467 × 1,698 km
COSPAR1978-100R
Maneuver capableNo
Uncontrolled debris fragment tracked by the public catalogue. About space debris →
Profile →Globe →

Where This Happens

Altitude context
DEBRIS BELT 700–1000 KM2006001,0001,5002,000 kmTHIS PASS · 1507 KMISS 420Starlink 550

At 1507 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 ⟷ SL-14 DEB
2026-10-30 18:282.57 km Final forecast3.11 km/s1,507 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 Nothing is overwritten: a withdrawn forecast keeps its figure, with the newer check beside it, and the best estimate after the pass is a row of its own.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
30 Oct 12:32 UTC2.57 km Forecast30 Oct 18:28 UTC29 Oct 23:29 UTCRe-check
30 Oct 12:12 UTC2.80 km Forecast30 Oct 18:28 UTC29 Oct 23:29 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
1.21 km10-28 22:34 UTC
COSMOS 2439DELTA 1 DEB
2.73 km10-30 05:29 UTC
COSMOS 2439COSMOS 736
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 ⟷ SL-14 DEB: 2.57 km predicted close approach”, https://orbitalradar.com/conjunction/19174-32956 (accessed 2026-10-30).