Home›Maneuver Tracker›Close Approaches›YAOGAN 11 ⟷ SHIYAN 23 (SY-23)
MediumProximity
ChinaYAOGAN 11NORAD 37165 · launched Sep 2010Military payload
5.32kmPredicted miss distance
ChinaSHIYAN 23 (SY-23)NORAD 59728 · launched May 2024Military payload
Final forecastFinal forecast, made 10 min before the pass.
Closest approach23 Oct 202608:46 UTC
Relative speed13.37 km/sat the closest approach
Altitude619 kmlow Earth orbit
Last confirmed23 Oct08:36 UTC · final forecast
Track YAOGAN 11Track SHIYAN 23 (SY-23)All approaches
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CN YAOGAN 11 and CN SHIYAN 23 (SY-23) were predicted to reach a closest approach of 5.32 km at 2026-10-23 08:46 UTC, at a relative speed of 13.37 km/s. Final forecast, made 10 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 11Payload
NORAD 37165
CountryPRC
Launched2010-09-22
OrbitLEO · 598 × 646 km
COSPAR2010-047A
Maneuver capableUnknown
Profile →Globe →
SHIYAN 23 (SY-23)Payload
NORAD 59728
CountryPRC
Launched2024-05-11
OrbitLEO · 603 × 610 km
COSPAR2024-089A
Maneuver capableUnknown
Profile →Globe →

Where This Happens

Altitude context
DEBRIS BELT 700–1000 KM2006001,0001,5002,000 kmTHIS PASS · 619 KMISS 420Starlink 550

At 619 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 11 ⟷ SHIYAN 23 (SY-23)
2026-10-23 08:465.32 km Final forecast13.37 km/s619 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 Nothing is overwritten: a withdrawn forecast keeps its figure, with the newer check beside it, and the best estimate after the pass is a row of its own.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
23 Oct 01:16 UTC5.32 km Forecast23 Oct 08:46 UTC22 Oct 16:57 UTCRe-check
23 Oct 00:56 UTC9.95 km Forecast23 Oct 08:46 UTC22 Oct 16:57 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
1.15 km10-23 12:12 UTC
YAOGAN 11COSMOS 2251 DEB
1.50 km10-24 06:26 UTC
SHIYAN 23 (SY-23)COSMOS 2251 DEB
1.57 km10-22 08:10 UTC
SHIYAN 23 (SY-23)FENGYUN 1C 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 →

Cite this encounter: Orbital Radar — “YAOGAN 11 ⟷ SHIYAN 23 (SY-23): 5.32 km predicted close approach”, https://orbitalradar.com/conjunction/37165-59728 (accessed 2026-10-23).