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US SPACEMOBILE-008US STARLINK-3661
2.63 kmpredicted miss distance
Final forecastFinal forecast, made 20 min before the pass.
After the passBest estimate, from the orbit data published nearest its time: 2.70 km at 21 Oct 00:12 UTC.
Predicted closest approach
2026-10-21 00:12 UTC
Relative speed
8.07 km/s
Altitude
520 km
Last confirmed
20 Oct 23:52 UTC
Track SPACEMOBILE-008 →Track STARLINK-3661 →All approaches →
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US SPACEMOBILE-008 and US STARLINK-3661 were predicted to reach a closest approach of 2.63 km at 2026-10-21 00:12 UTC, at a relative speed of 8.07 km/s. Final forecast, made 20 min before the pass. Best estimate after the pass, from the orbit data published nearest its time: 2.70 km at 21 Oct 00:12 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
SPACEMOBILE-008Payload
NORAD 69589
CountryUS
Launched2026-06-17
OrbitLEO · 524 × 529 km
COSPAR2026-139A
Maneuver capableUnknown
Profile →Globe →
STARLINK-3661Payload
NORAD 52129
CountryUS
Launched2022-03-19
OrbitLEO · 525 × 527 km
COSPAR2022-029AT
Maneuver capableUnknown
Profile →Globe →

Where This Happens

Altitude context
DEBRIS BELT 700–1000 KM2006001,0001,5002,000 kmTHIS PASS · 520 KMISS 420Starlink 550

At 520 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

3 predicted passes under 10 km
Pair history · SPACEMOBILE-008 ⟷ STARLINK-3661
2026-10-21 01:478.12 km Final forecast8.07 km/s520 kmView →
2026-10-21 00:122.63 km Final forecast8.07 km/s520 kmShown above
2026-10-20 18:39538 m Final forecast8.06 km/s531 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 00:16 UTC2.70 km Best estimate21 Oct 00:12 UTC21 Oct 01:16 UTCBest estimate
20 Oct 21:52 UTC2.63 km Forecast21 Oct 00:12 UTC20 Oct 14:19 UTCRe-check
20 Oct 15:52 UTC2.61 km Forecast21 Oct 00:12 UTC20 Oct 10:44 UTCRe-check
20 Oct 12:32 UTC3.85 km Forecast21 Oct 00:12 UTC20 Oct 07:49 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
2.41 km10-25 03:55 UTC
SPACEMOBILE-008SL-14 DEB
3.17 km10-25 23:28 UTC
SPACEMOBILE-008FORMOSAT7-3/COSMIC2-3
3.19 km10-20 14:02 UTC
SPACEMOBILE-008SL-6 R/B(2)

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 — “SPACEMOBILE-008 ⟷ STARLINK-3661: 2.63 km predicted close approach”, https://orbitalradar.com/conjunction/52129-69589 (accessed 2026-10-26).