Home›Maneuver Tracker›Close Approaches›STARCATCHER-1 ⟷ FLOCK 4J-10
CriticalProximity
United StatesSTARCATCHER-1NORAD 100921 · launched Oct 2026Payload
702mPredicted miss distance
United StatesFLOCK 4J-10NORAD 101195 · launched Oct 2026Payload
Final forecastFinal forecast, made 17 min before the pass.
Closest approach31 Oct 202616:13 UTC
Drift speed0.7 m/s2 km/h, seen from FLOCK 4J-10
Altitude522 kmlow Earth orbit
Last confirmed31 Oct15:56 UTC · final forecast
Track STARCATCHER-1Track FLOCK 4J-10All approaches
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US STARCATCHER-1 and US FLOCK 4J-10 were predicted to reach a closest approach of 702 m at 2026-10-31 16:13 UTC, drifting past at about 0.7 m/s (2 km/h) as seen from FLOCK 4J-10. Final forecast, made 17 min before the pass. 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
STARCATCHER-1Payload
NORAD 100921
CountryUS
Launched2026-10-01
OrbitLEO · 511 × 516 km
COSPAR2026-227AQ
Maneuver capableUnknown
Profile →Globe →
FLOCK 4J-10Payload
NORAD 101195
CountryUS
Launched2026-10-01
OrbitLEO · 512 × 517 km
COSPAR2026-227CY
Maneuver capableUnknown
Profile →Globe →

Where This Happens

Altitude context
DEBRIS BELT 700–1000 KM2006001,0001,5002,000 kmTHIS PASS · 522 KMISS 420Starlink 550

At 522 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 · STARCATCHER-1 ⟷ FLOCK 4J-10
2026-10-31 18:076.91 km Final forecast0.01 km/s513 kmView →
2026-10-31 17:165.09 km Final forecast0.01 km/s519 kmView →
2026-10-31 16:13702 m Final forecast0.00 km/s522 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
31 Oct 15:16 UTC702 m Forecast31 Oct 16:13 UTC31 Oct 10:45 UTCRe-check
31 Oct 09:16 UTC986 m Forecast31 Oct 16:11 UTC31 Oct 04:44 UTCRe-check
31 Oct 03:42 UTC1.54 km Forecast31 Oct 16:11 UTC30 Oct 22:45 UTCRe-check
30 Oct 16:12 UTC7.97 km Forecast31 Oct 16:09 UTC30 Oct 02:45 UTCRe-check
30 Oct 15:52 UTC9.01 km Forecast31 Oct 15:52 UTC30 Oct 02:45 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
625 m10-26 05:28 UTC
STARCATCHER-1HOTSAT-3
679 m10-26 06:13 UTC
STARCATCHER-1HOTSAT-3
753 m11-01 04:41 UTC
STARCATCHER-1OBJECT CE

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 — “STARCATCHER-1 ⟷ FLOCK 4J-10: 702 m predicted close approach”, https://orbitalradar.com/conjunction/100921-101195 (accessed 2026-11-01).