Home›Maneuver Tracker›Close Approaches›RADIX-M ⟷ FLOCK 4J-5
HighProximity
United StatesRADIX-MNORAD 100940 · launched Oct 2026Payload
3.86kmPredicted miss distance
United StatesFLOCK 4J-5NORAD 101104 · launched Oct 2026Payload
Live forecastConfirmed by the latest screening, 26 Oct 23:25 UTC.
Closest approach27 Oct 202605:13 UTC
Drift speed2.4 m/s9 km/h, seen from FLOCK 4J-5
Altitude503 kmlow Earth orbit
Separation now—live
Track RADIX-MTrack FLOCK 4J-5All approaches
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US RADIX-M and US FLOCK 4J-5 are predicted to reach a closest approach of 3.86 km at 2026-10-27 05:13 UTC, drifting past at about 2.4 m/s (9 km/h) as seen from FLOCK 4J-5. Confirmed by the latest screening, 26 Oct 23:25 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
RADIX-MPayload
NORAD 100940
CountryUS
Launched2026-10-01
OrbitLEO · 509 × 516 km
COSPAR2026-227BK
Maneuver capableUnknown
Profile →Globe →
FLOCK 4J-5Payload
NORAD 101104
CountryUS
Launched2026-10-01
OrbitLEO · 508 × 516 km
COSPAR2026-227CS
Maneuver capableUnknown
Profile →Globe →

Where This Happens

Altitude context
DEBRIS BELT 700–1000 KM2006001,0001,5002,000 kmTHIS PASS · 503 KMISS 420Starlink 550

At 503 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

4 predicted passes under 10 km
Pair history · RADIX-M ⟷ FLOCK 4J-5
2026-10-27 08:111.44 km Not re-confirmed0.00 km/s502 kmView →
2026-10-27 07:26262 m Live forecast0.00 km/s523 kmView →
2026-10-27 06:41867 m Not re-confirmed0.00 km/s501 kmView →
2026-10-27 05:133.86 km Live forecast0.01 km/s503 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
26 Oct 22:05 UTC3.86 km Forecast27 Oct 05:13 UTC26 Oct 14:45 UTCRe-check
26 Oct 16:41 UTC4.00 km Forecast27 Oct 05:13 UTC26 Oct 12:45 UTCRe-check
26 Oct 09:03 UTC4.68 km Forecast27 Oct 05:13 UTC25 Oct 22:45 UTCRe-check
26 Oct 05:23 UTC7.85 km Forecast27 Oct 05:15 UTC25 Oct 22:45 UTCRe-check
26 Oct 05:03 UTC8.59 km Forecast27 Oct 05:03 UTC25 Oct 22:45 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
438 m10-23 06:41 UTC
YAOGAN-39 03CFLOCK 4J-5
473 m10-26 10:49 UTC
RADIX-AFLOCK 4J-5
646 m10-20 13:14 UTC
RADIX-MRADIX-A

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 — “RADIX-M ⟷ FLOCK 4J-5: 3.86 km predicted close approach”, https://orbitalradar.com/conjunction/100940-101104 (accessed 2026-10-26).