Home›Maneuver Tracker›Close Approaches›YAOGAN-39 03C ⟷ YAOGAN-39 05B
HighProximity
ChinaYAOGAN-39 03CNORAD 57990 · launched Oct 2023Military payload
1.82kmPredicted miss distance
ChinaYAOGAN-39 05BNORAD 58558 · launched Dec 2023Military payload
Final forecastFinal forecast, made 17 min before the pass.
Closest approach22 Oct 202622:53 UTC
Relative speed8.31 km/sat the closest approach
Altitude522 kmlow Earth orbit
Last confirmed22 Oct22:36 UTC · final forecast
Track YAOGAN-39 03CTrack YAOGAN-39 05BAll approaches
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CN YAOGAN-39 03C and CN YAOGAN-39 05B were predicted to reach a closest approach of 1.82 km at 2026-10-22 22:53 UTC, at a relative speed of 8.31 km/s. Final forecast, made 17 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
YAOGAN-39 03CPayload
NORAD 57990
CountryPRC
Launched2023-10-05
OrbitLEO · 502 × 526 km
COSPAR2023-152E
Maneuver capableUnknown
Profile →Globe →
YAOGAN-39 05BPayload
NORAD 58558
CountryPRC
Launched2023-12-10
OrbitLEO · 507 × 523 km
COSPAR2023-194B
Maneuver capableUnknown
Profile →Globe →

Where This Happens

Altitude context
DEBRIS BELT 700–1000 KM2006001,0001,5002,000 kmTHIS PASS · 522 KMISS 420Starlink 550

At 522 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

4 predicted passes under 10 km
Pair history · YAOGAN-39 03C ⟷ YAOGAN-39 05B
2026-10-23 04:245.80 km Live forecast8.33 km/s505 kmView →
2026-10-23 02:504.15 km Live forecast8.33 km/s505 kmView →
2026-10-22 22:531.82 km Final forecast8.31 km/s522 kmShown above
2026-10-22 21:187.33 km Final forecast8.31 km/s522 kmView →

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
22 Oct 22:16 UTC1.82 km Forecast22 Oct 22:53 UTC22 Oct 12:31 UTCRe-check
22 Oct 21:13 UTC1.80 km Forecast22 Oct 22:53 UTC22 Oct 07:47 UTCRe-check
22 Oct 20:53 UTC3.20 km Forecast22 Oct 22:53 UTC22 Oct 07:47 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
438 m10-23 06:41 UTC
YAOGAN-39 03CFLOCK 4J-5
1.04 km10-18 19:56 UTC
YAOGAN-39 05BLEMUR-2-STAS-GORBUK
2.63 km10-18 04:31 UTC
YAOGAN-39 05BHINCUBE

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 — “YAOGAN-39 03C ⟷ YAOGAN-39 05B: 1.82 km predicted close approach”, https://orbitalradar.com/conjunction/57990-58558 (accessed 2026-10-23).