Home›Maneuver Tracker›Close Approaches›COSMOS 2535 ⟷ COSMOS 2251 DEB
HighProximity
RussiaCOSMOS 2535NORAD 44421 · launched Jul 2019Military payload
3.12kmPredicted miss distance
RussiaCOSMOS 2251 DEBNORAD 33999 · launched Jun 1993Military debris
Live forecastConfirmed by the latest screening, 25 Oct 22:44 UTC.
Closest approach26 Oct 202600:29 UTC
Relative speed3.26 km/sat the closest approach
Altitude593 kmlow Earth orbit
Separation now—live
Track COSMOS 2535Track COSMOS 2251 DEBAll approaches
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RU COSMOS 2535 and RU COSMOS 2251 DEB are predicted to reach a closest approach of 3.12 km at 2026-10-26 00:29 UTC, at a relative speed of 3.26 km/s. Confirmed by the latest screening, 25 Oct 22:44 UTC. 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 2535Payload
NORAD 44421
CountryCIS
Launched2019-07-10
OrbitLEO · 585 × 598 km
COSPAR2019-039A
Maneuver capableUnknown
Profile →Globe →
COSMOS 2251 DEBDebris
NORAD 33999
CountryCIS
Launched1993-06-16
OrbitLEO · 573 × 624 km
COSPAR1993-036GJ
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 · 593 KMISS 420Starlink 550

At 593 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 2535 ⟷ COSMOS 2251 DEB
2026-10-26 00:293.12 km Live forecast3.26 km/s593 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 Nothing is overwritten: a withdrawn forecast keeps its figure, with the newer check beside it, and the best estimate after the pass is a row of its own.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
25 Oct 03:29 UTC3.12 km Forecast26 Oct 00:29 UTC24 Oct 07:22 UTCRe-check
25 Oct 03:09 UTC3.36 km Forecast26 Oct 00:29 UTC24 Oct 07:22 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
3.13 km10-26 19:20 UTC
COSMOS 2535PERSEUS M2
3.94 km10-20 19:17 UTC
COSMOS 2535LEMUR-2 DELOITTE-2
4.04 km10-20 06:27 UTC
COSMOS 2535LEMUR-2-DELOITTE-5

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 2535 ⟷ COSMOS 2251 DEB: 3.12 km predicted close approach”, https://orbitalradar.com/conjunction/33999-44421 (accessed 2026-10-25).