Home›Maneuver Tracker›Close Approaches›RADIX-A ⟷ STARLINK-3077
HighProximity
United StatesRADIX-ANORAD 100941 · launched Oct 2026Payload
2.54kmPredicted miss distance
United StatesSTARLINK-3077NORAD 49133 · launched Sep 2021Payload
Final forecastFinal forecast, made 10 min before the pass.
After the passBest estimate, from the orbit data published nearest its time: 786 m at 24 Oct 09:58 UTC. One of the two changed orbit around the time of the pass (a maneuver or strong drag), so this estimate is less certain.
Closest approach24 Oct 202609:58 UTC
Relative speed9.22 km/sat the closest approach
Altitude523 kmlow Earth orbit
Last confirmed24 Oct09:49 UTC · final forecast
Track RADIX-ATrack STARLINK-3077All approaches
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US RADIX-A and US STARLINK-3077 were predicted to reach a closest approach of 2.54 km at 2026-10-24 09:58 UTC, at a relative speed of 9.22 km/s. Final forecast, made 10 min before the pass. Best estimate after the pass, from the orbit data published nearest its time: 786 m at 24 Oct 09:58 UTC. One of the two changed orbit around the time of the pass (a maneuver or strong drag), so this estimate is less certain. 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 →
STARLINK-3077Payload
NORAD 49133
CountryUS
Launched2021-09-14
OrbitLEO · 501 × 505 km
COSPAR2021-082D
Maneuver capableUnknown
Profile →Globe →

Where This Happens

Altitude context
DEBRIS BELT 700–1000 KM2006001,0001,5002,000 kmTHIS PASS · 523 KMISS 420Starlink 550

At 523 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 ⟷ STARLINK-3077
2026-10-26 12:379.24 km Withdrawn8.48 km/s518 kmView →
2026-10-24 09:582.54 km Final forecast9.22 km/s523 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
27 Oct 03:04 UTC786 m Best estimate24 Oct 09:58 UTC24 Oct 20:31 UTCBest estimate
24 Oct 06:29 UTC2.54 km Forecast24 Oct 09:58 UTC24 Oct 00:36 UTCRe-check
24 Oct 00:29 UTC5.50 km Forecast24 Oct 09:58 UTC23 Oct 20:00 UTCRe-check
23 Oct 18:49 UTC5.26 km Forecast24 Oct 09:58 UTC23 Oct 13:26 UTCRe-check
23 Oct 18:29 UTC5.71 km Forecast24 Oct 09:58 UTC23 Oct 13:26 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
397 m10-30 05:02 UTC
RADIX-AFLOCK 4J-6
473 m10-26 10:49 UTC
RADIX-AFLOCK 4J-5
1.14 km10-25 06:55 UTC
RADIX-ASTARLINK-4782

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 ⟷ STARLINK-3077: 2.54 km predicted close approach”, https://orbitalradar.com/conjunction/100941-49133 (accessed 2026-10-31).