Home›Maneuver Tracker›Close Approaches›COSMOS 2599 ⟷ FENGYUN 1C DEB
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RussiaCOSMOS 2599NORAD 66649 · launched Nov 2025Military payload
3.28kmPredicted miss distance
ChinaFENGYUN 1C DEBNORAD 30928 · launched May 1999Debris
Live forecastConfirmed by the latest screening, 12 Nov 23:34 UTC.
Closest approach13 Nov 202614:39 UTC
Relative speed8.73 km/sat the closest approach
Altitude1,497 kmlow Earth orbit
Separation now—live
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RU COSMOS 2599 and CN FENGYUN 1C DEB are predicted to reach a closest approach of 3.28 km at 2026-11-13 14:39 UTC, at a relative speed of 8.73 km/s. Confirmed by the latest screening, 12 Nov 23:34 UTC. This is a cross-border encounter between objects of different nations. 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 2599Payload
NORAD 66649
CountryCIS
Launched2025-11-25
OrbitLEO · 1,482 × 1,507 km
COSPAR2025-273C
Maneuver capableUnknown
Profile →Globe →
FENGYUN 1C DEBDebris
NORAD 30928
CountryPRC
Launched1999-05-10
OrbitLEO · 834 × 1,514 km
COSPAR1999-025AZS
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 · 1497 KMISS 420Starlink 550

At 1497 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 2599 ⟷ FENGYUN 1C DEB
2026-11-13 14:393.28 km Live forecast8.73 km/s1,497 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
12 Nov 23:01 UTC3.28 km Forecast13 Nov 14:39 UTC12 Nov 16:51 UTCRe-check
12 Nov 19:13 UTC3.29 km Forecast13 Nov 14:39 UTC12 Nov 09:07 UTCRe-check
12 Nov 18:09 UTC3.23 km Forecast13 Nov 14:39 UTC12 Nov 02:07 UTCRe-check
12 Nov 17:49 UTC4.88 km Forecast13 Nov 14:39 UTC12 Nov 02:07 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
3.55 km11-07 22:28 UTC
COSMOS 2599COSMOS 565
6.22 km11-08 10:07 UTC
COSMOS 2599SL-14 R/B
6.83 km11-09 03:29 UTC
COSMOS 2599SL-8 R/B

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 →

✓ Permanent record. This encounter met the notability thresholds and keeps an archived page after the pass.