Home›Maneuver Tracker›Close Approaches›SHIYAN 23 (SY-23) ⟷ CZ-4 DEB
HighProximity
ChinaSHIYAN 23 (SY-23)NORAD 59728 · launched May 2024Military payload
2.13kmPredicted miss distance
ChinaCZ-4 DEBNORAD 26262 · launched Oct 1999Debris
Final forecastFinal forecast, made minutes before the pass.
After the passBest estimate, from the orbit data published nearest its time: 2.00 km at 7 Nov 07:56 UTC.
Closest approach7 Nov 202607:56 UTC
Relative speed12.07 km/sat the closest approach
Altitude595 kmlow Earth orbit
Last confirmed7 Nov07:54 UTC · final forecast
Track SHIYAN 23 (SY-23)Track CZ-4 DEBAll approaches
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CN SHIYAN 23 (SY-23) and CN CZ-4 DEB were predicted to reach a closest approach of 2.13 km at 2026-11-07 07:56 UTC, at a relative speed of 12.07 km/s. Final forecast, made minutes before the pass. Best estimate after the pass, from the orbit data published nearest its time: 2.00 km at 7 Nov 07:56 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 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
SHIYAN 23 (SY-23)Payload
NORAD 59728
CountryPRC
Launched2024-05-11
OrbitLEO · 603 × 610 km
COSPAR2024-089A
Maneuver capableUnknown
Profile →Globe →
CZ-4 DEBDebris
NORAD 26262
CountryPRC
Launched1999-10-14
OrbitLEO · 589 × 640 km
COSPAR1999-057EY
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 · 595 KMISS 420Starlink 550

At 595 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 · SHIYAN 23 (SY-23) ⟷ CZ-4 DEB
2026-11-07 07:562.13 km Final forecast · after: 2.00 km12.07 km/s595 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
11 Nov 12:37 UTC2.00 km Best estimate7 Nov 07:56 UTC7 Nov 17:16 UTCBest estimate
6 Nov 22:14 UTC2.13 km Forecast7 Nov 07:56 UTC6 Nov 18:40 UTCRe-check
6 Nov 09:41 UTC2.54 km Forecast7 Nov 07:56 UTC5 Nov 18:58 UTCRe-check
6 Nov 09:20 UTC6.94 km Forecast7 Nov 07:56 UTC5 Nov 18:58 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
2.94 km11-12 06:52 UTC
SHIYAN 23 (SY-23)GEESAT 5-01
3.40 km11-12 09:06 UTC
SHIYAN 23 (SY-23)SL-14 R/B
3.64 km11-12 04:54 UTC
SHIYAN 23 (SY-23)TIROS 6 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 →