Home›Maneuver Tracker›Close Approaches›COSMOS 2116 ⟷ COSMOS 1828
HighProximity
RussiaCOSMOS 2116NORAD 21030 · launched Dec 1990Military payload
3.56kmPredicted miss distance
RussiaCOSMOS 1828NORAD 17583 · launched Mar 1987Military payload
Final forecastFinal forecast, made 16 min before the pass.
After the passBest estimate, from the orbit data published nearest its time: 3.55 km at 29 Oct 22:47 UTC.
Closest approach29 Oct 202622:47 UTC
Relative speed5.01 km/sat the closest approach
Altitude1,416 kmlow Earth orbit
Last confirmed29 Oct22:31 UTC · final forecast
Track COSMOS 2116Track COSMOS 1828All approaches
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RU COSMOS 2116 and RU COSMOS 1828 were predicted to reach a closest approach of 3.56 km at 2026-10-29 22:47 UTC, at a relative speed of 5.01 km/s. Final forecast, made 16 min before the pass. Best estimate after the pass, from the orbit data published nearest its time: 3.55 km at 29 Oct 22:47 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 2116Payload
NORAD 21030
CountryCIS
Launched1990-12-22
OrbitLEO · 1,401 × 1,409 km
COSPAR1990-114C
Maneuver capableUnknown
Profile →Globe →
COSMOS 1828Payload
NORAD 17583
CountryCIS
Launched1987-03-13
OrbitLEO · 1,382 × 1,413 km
COSPAR1987-026B
Maneuver capableUnknown
Profile →Globe →

Where This Happens

Altitude context
DEBRIS BELT 700–1000 KM2006001,0001,5002,000 kmTHIS PASS · 1416 KMISS 420Starlink 550

At 1416 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 2116 ⟷ COSMOS 1828
2026-10-29 22:473.56 km Final forecast5.01 km/s1,416 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
2 Nov 17:15 UTC3.55 km Best estimate29 Oct 22:47 UTC29 Oct 20:15 UTCBest estimate
29 Oct 21:31 UTC3.56 km Forecast29 Oct 22:47 UTC29 Oct 07:06 UTCRe-check
29 Oct 06:15 UTC3.57 km Forecast29 Oct 22:47 UTC28 Oct 15:04 UTCRe-check
29 Oct 05:55 UTC4.46 km Forecast29 Oct 22:47 UTC28 Oct 15:04 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
6.38 km11-04 06:39 UTC
COSMOS 2116COSMOS 252 DEB
6.66 km10-27 12:40 UTC
COSMOS 2116GLOBALSTAR M073
6.78 km10-29 02:52 UTC
COSMOS 2116COSMOS 2252

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 2116 ⟷ COSMOS 1828: 3.56 km predicted close approach”, https://orbitalradar.com/conjunction/17583-21030 (accessed 2026-11-03).