Home›Maneuver Tracker›Close Approaches›SDA-NG-T1TL-403 ⟷ PRAETORIAN SDA_602
HighProximity
United StatesSDA-NG-T1TL-403NORAD 100985 · launched Oct 2026Payload
1.85kmPredicted miss distance
United StatesPRAETORIAN SDA_602NORAD 65565 · launched Sep 2025Payload
Final forecastFinal forecast, made minutes before the pass.
Closest approach3 Nov 202606:53 UTC
Relative speed7.63 km/sat the closest approach
Altitude943 kmlow Earth orbit
Last confirmed3 Nov06:49 UTC · final forecast
Track SDA-NG-T1TL-403Track PRAETORIAN SDA_602All approaches
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US SDA-NG-T1TL-403 and US PRAETORIAN SDA_602 were predicted to reach a closest approach of 1.85 km at 2026-11-03 06:53 UTC, at a relative speed of 7.63 km/s. Final forecast, made minutes 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
SDA-NG-T1TL-403Payload
NORAD 100985
CountryUS
Launched2026-10-10
OrbitLEO · 938 × 952 km
COSPAR2026-231C
Maneuver capableUnknown
Profile →Globe →
PRAETORIAN SDA_602Payload
NORAD 65565
CountryUS
Launched2025-09-10
OrbitLEO · 946 × 954 km
COSPAR2025-203A
Maneuver capableUnknown
Profile →Globe →

Where This Happens

Altitude context
DEBRIS BELT 700–1000 KM2006001,0001,5002,000 kmTHIS PASS · 943 KMISS 420Starlink 550

At 943 km this pass sits inside the most congested band in low Earth orbit, home to the debris left by the 2007 ASAT test and the 2009 collision. 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 · SDA-NG-T1TL-403 ⟷ PRAETORIAN SDA_602
2026-11-03 06:531.85 km Final forecast7.63 km/s943 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
2 Nov 21:35 UTC1.85 km Forecast3 Nov 06:53 UTC2 Nov 07:55 UTCRe-check
2 Nov 09:14 UTC1.86 km Forecast3 Nov 06:53 UTC2 Nov 02:43 UTCRe-check
2 Nov 08:55 UTC5.35 km Forecast3 Nov 06:53 UTC1 Nov 07:37 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
1.30 km10-29 07:17 UTC
SDA-NG-T1TL-403PRAETORIAN SDA_619
2.33 km11-03 03:24 UTC
PRAETORIAN SDA_521SDA-NG-T1TL-403
2.89 km11-02 06:36 UTC
SDA-NG-T1TL-403COSMOS 1275 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 →