Home›Maneuver Tracker›Close Approaches›YAOGAN 2 ⟷ NANOSAT 1B
HighProximity
ChinaYAOGAN 2NORAD 31490 · launched May 2007Military payload
4.46kmPredicted miss distance
EuropeNANOSAT 1BNORAD 35685 · launched Jul 2009Payload
Final forecastFinal forecast, made minutes before the pass.
After the passBest estimate, from the orbit data published nearest its time: 4.47 km at 28 Oct 08:25 UTC.
Closest approach28 Oct 202608:25 UTC
Relative speed11.56 km/sat the closest approach
Altitude627 kmlow Earth orbit
Last confirmed28 Oct08:23 UTC · final forecast
Track YAOGAN 2Track NANOSAT 1BAll approaches
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CN YAOGAN 2 and SPN NANOSAT 1B were predicted to reach a closest approach of 4.46 km at 2026-10-28 08:25 UTC, at a relative speed of 11.56 km/s. Final forecast, made minutes before the pass. Best estimate after the pass, from the orbit data published nearest its time: 4.47 km at 28 Oct 08:25 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
YAOGAN 2Payload
NORAD 31490
CountryPRC
Launched2007-05-25
OrbitLEO · 606 × 634 km
COSPAR2007-019A
Maneuver capableUnknown
Profile →Globe →
NANOSAT 1BPayload
NORAD 35685
CountrySPN
Launched2009-07-29
OrbitLEO · 552 × 622 km
COSPAR2009-041E
Maneuver capableUnknown
Profile →Globe →

Where This Happens

Altitude context
DEBRIS BELT 700–1000 KM2006001,0001,5002,000 kmTHIS PASS · 627 KMISS 420Starlink 550

At 627 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 2 ⟷ NANOSAT 1B
2026-10-28 08:254.46 km Final forecast11.56 km/s627 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
1 Nov 05:56 UTC4.47 km Best estimate28 Oct 08:25 UTC28 Oct 13:41 UTCBest estimate
27 Oct 13:10 UTC4.47 km Forecast28 Oct 08:25 UTC27 Oct 07:08 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
2.54 km11-04 11:07 UTC
YAOGAN 2NOAA 17 DEB
2.81 km10-31 11:40 UTC
YAOGAN 2SL-14 R/B
4.74 km10-28 11:32 UTC
YAOGAN 2FENGYUN 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 →