Home›Maneuver Tracker›Close Approaches›RADIX-A ⟷ FLOCK 4J-5
medium · PROXIMITY
US RADIX-AUS FLOCK 4J-5
9.44 kmpredicted miss distance
Final forecastLast computed 26 Oct 13:27 UTC, while the two were flying close together.
Predicted closest approach
2026-10-26 13:27 UTC
Relative speed
0.01 km/s
Altitude
505 km
Last confirmed
26 Oct 13:27 UTC
Track RADIX-A →Track FLOCK 4J-5 →All approaches →
Share 𝕏 R

US RADIX-A and US FLOCK 4J-5 were predicted to reach a closest approach of 9.44 km at 2026-10-26 13:27 UTC, at a relative speed of 0.01 km/s. Last computed 26 Oct 13:27 UTC, while the two were flying close together. These two were already within 9.44 km of each other when this was computed and moving apart: they were flying close together rather than crossing paths, so this is their separation at the time shown. 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-APayload
NORAD 100941
CountryUS
Launched2026-10-01
OrbitLEO · 509 × 516 km
COSPAR2026-227BL
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 · 505 KMISS 420Starlink 550

At 505 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

2 predicted passes under 10 km
Pair history · RADIX-A ⟷ FLOCK 4J-5
2026-10-26 13:279.44 km Final forecast0.01 km/s505 kmShown above
2026-10-26 10:49473 m Final forecast0.00 km/s523 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
26 Oct 11:27 UTC1.32 km Forecast26 Oct 11:27 UTC25 Oct 22:45 UTCScreen
26 Oct 03:03 UTC792 m Forecast26 Oct 11:31 UTC25 Oct 22:45 UTCRe-check
25 Oct 19:01 UTC825 m Forecast26 Oct 10:52 UTC25 Oct 12:45 UTCRe-check
25 Oct 13:06 UTC679 m Forecast26 Oct 10:52 UTC25 Oct 08:45 UTCRe-check
25 Oct 10:19 UTC1.29 km Forecast26 Oct 10:26 UTC25 Oct 04:45 UTCRe-check
25 Oct 09:59 UTC2.74 km Forecast26 Oct 09:59 UTC25 Oct 04:45 UTCScreen
25 Oct 09:40 UTC3.88 km Forecast26 Oct 09:40 UTC25 Oct 02:44 UTCScreen
25 Oct 09:30 UTC4.15 km Forecast26 Oct 09:30 UTC25 Oct 02:44 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
262 m10-27 07:26 UTC
RADIX-MFLOCK 4J-5
438 m10-23 06:41 UTC
YAOGAN-39 03CFLOCK 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-A ⟷ FLOCK 4J-5: 9.44 km predicted close approach”, https://orbitalradar.com/conjunction/100941-101104 (accessed 2026-10-26).