Home›Maneuver Tracker›Close Approaches›PRAETORIAN SDA_517 ⟷ SDA-NG-T1TL-418
HighProximity
United StatesPRAETORIAN SDA_517NORAD 100075 · launched Jul 2026Payload
4.93kmPredicted miss distance
United StatesSDA-NG-T1TL-418NORAD 101000 · launched Oct 2026Payload
Live forecastConfirmed by the latest screening, 23 Oct 21:30 UTC.
Closest approach24 Oct 202606:36 UTC
Relative speed3.92 km/sat the closest approach
Altitude942 kmlow Earth orbit
Separation now—live
Track PRAETORIAN SDA_517Track SDA-NG-T1TL-418All approaches
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US PRAETORIAN SDA_517 and US SDA-NG-T1TL-418 are predicted to reach a closest approach of 4.93 km at 2026-10-24 06:36 UTC, at a relative speed of 3.92 km/s. Confirmed by the latest screening, 23 Oct 21:30 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
PRAETORIAN SDA_517Payload
NORAD 100075
CountryUS
Launched2026-07-16
OrbitLEO · 931 × 954 km
COSPAR2026-163S
Maneuver capableUnknown
Profile →Globe →
SDA-NG-T1TL-418Payload
NORAD 101000
CountryUS
Launched2026-10-10
OrbitLEO · 936 × 948 km
COSPAR2026-231T
Maneuver capableUnknown
Profile →Globe →

Where This Happens

Altitude context
DEBRIS BELT 700–1000 KM2006001,0001,5002,000 kmTHIS PASS · 942 KMISS 420Starlink 550

At 942 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

6 predicted passes under 10 km
Pair history · PRAETORIAN SDA_517 ⟷ SDA-NG-T1TL-418
2026-10-24 10:049.39 km Live forecast3.92 km/s942 kmView →
2026-10-24 08:207.12 km Live forecast3.92 km/s942 kmView →
2026-10-24 06:364.93 km Live forecast3.92 km/s942 kmShown above
2026-10-24 03:082.14 km Live forecast3.92 km/s942 kmView →
2026-10-24 01:253.36 km Live forecast3.92 km/s942 kmView →
2026-10-23 23:415.40 km Live forecast3.92 km/s942 kmView →

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 18:29 UTC4.93 km Forecast24 Oct 06:36 UTC23 Oct 03:19 UTCRe-check
23 Oct 11:25 UTC4.70 km Forecast24 Oct 06:36 UTC22 Oct 20:24 UTCRe-check
23 Oct 11:14 UTC4.93 km Forecast24 Oct 06:36 UTC22 Oct 20:24 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
585 m10-23 17:38 UTC
SDA-NG-T1TL-418PRAETORIAN SDA_614
1.89 km10-24 14:25 UTC
SDA-NG-T1TL-418FENGYUN 1C DEB
3.46 km10-22 03:32 UTC
PRAETORIAN SDA_517PRAETORIAN SDA_620

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 — “PRAETORIAN SDA_517 ⟷ SDA-NG-T1TL-418: 4.93 km predicted close approach”, https://orbitalradar.com/conjunction/100075-101000 (accessed 2026-10-23).