Home›Maneuver Tracker›Close Approaches›YAOGAN-39 01B ⟷ SL-12 R/B(AUX MOTOR)
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On permanent record
ChinaYAOGAN-39 01BNORAD 57728 · launched Aug 2023Military payload
4.07kmPredicted miss distance
RussiaSL-12 R/B(AUX MOTOR)NORAD 28632 · launched Mar 2005Rocket body
Live forecastConfirmed by the latest screening, 14 Nov 19:30 UTC.
Closest approach15 Nov 202607:15 UTC
Relative speed3.12 km/sat the closest approach
Altitude509 kmlow Earth orbit
Separation now—live
Track YAOGAN-39 01BTrack SL-12 R/B(AUX MOTOR)All approaches
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CN YAOGAN-39 01B and RU SL-12 R/B(AUX MOTOR) are predicted to reach a closest approach of 4.07 km at 2026-11-15 07:15 UTC, at a relative speed of 3.12 km/s. Confirmed by the latest screening, 14 Nov 19:30 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
YAOGAN-39 01BPayload
NORAD 57728
CountryPRC
Launched2023-08-31
OrbitLEO · 508 × 520 km
COSPAR2023-130B
Maneuver capableUnknown
Profile →Globe →
SL-12 R/B(AUX MOTOR)R/B
NORAD 28632
CountryCIS
Launched2005-03-29
OrbitMEO · 282 × 11,517 km
COSPAR2005-010D
Maneuver capableNo
Spent rocket stage: uncontrolled, tracked by the public catalogue.
Profile →Globe →

Where This Happens

Altitude context
DEBRIS BELT 700–1000 KM2006001,0001,5002,000 kmTHIS PASS · 509 KMISS 420Starlink 550

At 509 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 · YAOGAN-39 01B ⟷ SL-12 R/B(AUX MOTOR)
2026-11-15 07:154.07 km Live forecast3.12 km/s509 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
14 Nov 17:09 UTC4.07 km Forecast15 Nov 07:15 UTC14 Nov 09:22 UTCRe-check
14 Nov 11:53 UTC4.22 km Forecast15 Nov 07:15 UTC14 Nov 06:12 UTCRe-check
14 Nov 10:54 UTC4.53 km Forecast15 Nov 07:15 UTC13 Nov 23:53 UTCRe-check
14 Nov 10:35 UTC5.48 km Forecast15 Nov 07:15 UTC13 Nov 23:53 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
1.07 km11-13 05:17 UTC
YAOGAN-39 01BOTTER 24C
1.09 km11-09 17:25 UTC
YAOGAN-39 01BITASAT
1.40 km11-13 08:27 UTC
YAOGAN-39 01BFLOCK 4J-16

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.