Home›Maneuver Tracker›Close Approaches›SHIYAN 27A ⟷ QIANFAN-31
HighProximity
ChinaSHIYAN 27ANORAD 63599 · launched Apr 2025Military payload
1.36kmPredicted miss distance
ChinaQIANFAN-31NORAD 61564 · launched Oct 2024Payload
Final forecastFinal forecast, made 7 min before the pass.
After the passBest estimate, from the orbit data published nearest its time: 1.35 km at 7 Nov 16:18 UTC.
Closest approach7 Nov 202616:18 UTC
Relative speed10.30 km/sat the closest approach
Altitude1,054 kmlow Earth orbit
Last confirmed7 Nov16:11 UTC · final forecast
Track SHIYAN 27ATrack QIANFAN-31All approaches
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CN SHIYAN 27A and CN QIANFAN-31 were predicted to reach a closest approach of 1.36 km at 2026-11-07 16:18 UTC, at a relative speed of 10.30 km/s. Final forecast, made 7 min before the pass. Best estimate after the pass, from the orbit data published nearest its time: 1.35 km at 7 Nov 16:18 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 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
SHIYAN 27APayload
NORAD 63599
CountryPRC
Launched2025-04-18
OrbitLEO · 1,045 × 1,046 km
COSPAR2025-078A
Maneuver capableUnknown
Profile →Globe →
QIANFAN-31Payload
NORAD 61564
CountryPRC
Launched2024-10-15
OrbitLEO · 1,036 × 1,049 km
COSPAR2024-185N
Maneuver capableUnknown
Profile →Globe →

Where This Happens

Altitude context
DEBRIS BELT 700–1000 KM2006001,0001,5002,000 kmTHIS PASS · 1054 KMISS 420Starlink 550

At 1054 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 27A ⟷ QIANFAN-31
2026-11-07 16:181.36 km Final forecast · after: 1.35 km10.30 km/s1,054 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 23:58 UTC1.35 km Best estimate7 Nov 16:18 UTC7 Nov 23:49 UTCBest estimate
7 Nov 12:51 UTC1.36 km Forecast7 Nov 16:18 UTC7 Nov 07:54 UTCRe-check
7 Nov 10:45 UTC1.36 km Forecast7 Nov 16:18 UTC6 Nov 23:03 UTCRe-check
7 Nov 10:27 UTC3.92 km Forecast7 Nov 16:18 UTC6 Nov 23:03 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
1.45 km11-12 11:10 UTC
SHIYAN 27ACOSMOS 970 DEB
4.47 km11-06 12:51 UTC
SHIYAN 27AOPS 5798 DEB
5.47 km11-08 23:13 UTC
SHIYAN 27ATRANSIT 18 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 →