Home›Maneuver Tracker›Close Approaches›COSMOS 2400 ⟷ COSMOS 1056
MediumProximity
RussiaCOSMOS 2400NORAD 27868 · launched Aug 2003Military payload
7.46kmPredicted miss distance
RussiaCOSMOS 1056NORAD 11133 · launched Dec 1978Military payload
Final forecastFinal forecast, made 11 min before the pass.
Closest approach11 Nov 202604:56 UTC
Relative speed11.89 km/sat the closest approach
Altitude1,464 kmlow Earth orbit
Last confirmed11 Nov04:46 UTC · final forecast
Track COSMOS 2400Track COSMOS 1056All approaches
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RU COSMOS 2400 and RU COSMOS 1056 were predicted to reach a closest approach of 7.46 km at 2026-11-11 04:56 UTC, at a relative speed of 11.89 km/s. Final forecast, made 11 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 2400Payload
NORAD 27868
CountryCIS
Launched2003-08-19
OrbitLEO · 1,467 × 1,502 km
COSPAR2003-037A
Maneuver capableUnknown
Profile →Globe →
COSMOS 1056Payload
NORAD 11133
CountryCIS
Launched1978-12-05
OrbitLEO · 1,473 × 1,502 km
COSPAR1978-109F
Maneuver capableUnknown
Profile →Globe →

Where This Happens

Altitude context
DEBRIS BELT 700–1000 KM2006001,0001,5002,000 kmTHIS PASS · 1464 KMISS 420Starlink 550

At 1464 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 2400 ⟷ COSMOS 1056
2026-11-11 09:462.65 km Final forecast11.82 km/s1,508 kmView →
2026-11-11 04:567.46 km Final forecast11.89 km/s1,464 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 Nothing is overwritten: a withdrawn forecast keeps its figure, with the newer check beside it, and the best estimate after the pass is a row of its own.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
10 Nov 15:06 UTC7.46 km Forecast11 Nov 04:56 UTC10 Nov 05:13 UTCRe-check
10 Nov 14:46 UTC8.38 km Forecast11 Nov 04:56 UTC10 Nov 05:13 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
3.13 km11-06 23:57 UTC
COSMOS 2509COSMOS 1056
3.70 km11-07 11:17 UTC
COSMOS 2400COSMOS 1410
4.00 km11-14 12:44 UTC
COSMOS 2400DELTA 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 →