Home›Maneuver Tracker›Close Approaches›COSMOS 2146 ⟷ SL-14 DEB
MediumProximity
RussiaCOSMOS 2146NORAD 21302 · launched May 1991Military payload
9.06kmPredicted miss distance
RussiaSL-14 DEBNORAD 25999 · launched Sep 1991Debris
Final forecastFinal forecast, made 17 min before the pass.
Closest approach3 Nov 202613:43 UTC
Relative speed14.19 km/sat the closest approach
Altitude1,408 kmlow Earth orbit
Last confirmed3 Nov13:27 UTC · final forecast
Track COSMOS 2146Track SL-14 DEBAll approaches
Share

RU COSMOS 2146 and RU SL-14 DEB were predicted to reach a closest approach of 9.06 km at 2026-11-03 13:43 UTC, at a relative speed of 14.19 km/s. Final forecast, made 17 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 2146Payload
NORAD 21302
CountryCIS
Launched1991-05-16
OrbitLEO · 1,391 × 1,418 km
COSPAR1991-033D
Maneuver capableUnknown
Profile →Globe →
SL-14 DEBDebris
NORAD 25999
CountryCIS
Launched1991-09-28
OrbitLEO · 1,365 × 1,465 km
COSPAR1991-068J
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 · 1408 KMISS 420Starlink 550

At 1408 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 2146 ⟷ SL-14 DEB
2026-11-03 13:439.06 km Final forecast14.19 km/s1,408 kmShown above
2026-11-03 11:496.80 km Final forecast14.19 km/s1,408 kmView →

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 Nothing is overwritten: a withdrawn forecast keeps its figure, with the newer check beside it, and the best estimate after the pass is a row of its own.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
3 Nov 09:13 UTC9.06 km Forecast3 Nov 13:43 UTC2 Nov 19:46 UTCRe-check
2 Nov 21:35 UTC9.04 km Forecast3 Nov 13:43 UTC2 Nov 10:16 UTCRe-check
2 Nov 14:35 UTC8.99 km Forecast3 Nov 13:43 UTC2 Nov 02:40 UTCRe-check
2 Nov 14:15 UTC9.39 km Forecast3 Nov 13:43 UTC2 Nov 02:40 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
4.63 km10-30 01:49 UTC
COSMOS 2146GLOBALSTAR M089
6.08 km11-01 17:46 UTC
COSMOS 2146COSMOS 909
6.72 km11-02 23:57 UTC
COSMOS 2146COSMOS 1831

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 →