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MediumProximity
RussiaCOSMOS 2453NORAD 35500 · launched Jul 2009Military payload
6.44kmPredicted miss distance
RussiaCOSMOS 2490NORAD 39485 · launched Dec 2013Military payload
Final forecastFinal forecast, made 8 min before the pass.
After the passBest estimate, from the orbit data published nearest its time: 6.21 km at 7 Nov 04:02 UTC.
Closest approach7 Nov 202604:02 UTC
Relative speed9.05 km/sat the closest approach
Altitude1,506 kmlow Earth orbit
Last confirmed7 Nov03:54 UTC · final forecast
Track COSMOS 2453Track COSMOS 2490All approaches
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RU COSMOS 2453 and RU COSMOS 2490 were predicted to reach a closest approach of 6.44 km at 2026-11-07 04:02 UTC, at a relative speed of 9.05 km/s. Final forecast, made 8 min before the pass. Best estimate after the pass, from the orbit data published nearest its time: 6.21 km at 7 Nov 04:02 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 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 2453Payload
NORAD 35500
CountryCIS
Launched2009-07-06
OrbitLEO · 1,495 × 1,505 km
COSPAR2009-036C
Maneuver capableUnknown
Profile →Globe →
COSMOS 2490Payload
NORAD 39485
CountryCIS
Launched2013-12-25
OrbitLEO · 1,477 × 1,512 km
COSPAR2013-076C
Maneuver capableUnknown
Profile →Globe →

Where This Happens

Altitude context
DEBRIS BELT 700–1000 KM2006001,0001,5002,000 kmTHIS PASS · 1506 KMISS 420Starlink 550

At 1506 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 2453 ⟷ COSMOS 2490
2026-11-07 04:026.44 km Final forecast · after: 6.21 km9.05 km/s1,506 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
11 Nov 06:26 UTC6.21 km Best estimate7 Nov 04:02 UTC7 Nov 08:25 UTCBest estimate
6 Nov 22:14 UTC6.44 km Forecast7 Nov 04:02 UTC6 Nov 18:49 UTCRe-check
6 Nov 21:13 UTC6.68 km Forecast7 Nov 04:02 UTC5 Nov 21:38 UTCRe-check
6 Nov 20:54 UTC9.76 km Forecast7 Nov 04:02 UTC5 Nov 21:38 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
2.18 km11-11 03:51 UTC
COSMOS 2490COSMOS 1853
4.03 km11-12 01:02 UTC
COSMOS 2490COSMOS 336
4.41 km11-10 05:43 UTC
COSMOS 2453GLOBALSTAR M028

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 →