Not re-confirmedLast re-confirmed by the screening 61 min before the pass. Newer orbit data, from 21 Oct 06:29 UTC, put them 10.1 km apart. The most recent pass the screening confirmed up to its time: 6.82 km on 21 Oct 12:38 UTC.
After the passBest estimate, from the orbit data published nearest its time: 10.3 km at 21 Oct 14:13 UTC.
USREASON-1 and TBDOBJECT CF were predicted to reach a closest approach of 9.30 km at 2026-10-21 14:13 UTC, drifting past at about 1.9 m/s (7 km/h) as seen from OBJECT CF. Last re-confirmed by the screening 61 min before the pass. Newer orbit data, from 21 Oct 06:29 UTC, put them 10.1 km apart. Best estimate after the pass, from the orbit data published nearest its time: 10.3 km at 21 Oct 14:13 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.
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
6 predicted passes under 10 km
Pair history · REASON-1 ⟷ OBJECT CF
2026-10-21 14:139.30 km Not re-confirmed0.01 km/s522 kmShown above
2026-10-21 12:386.82 km Final forecast0.01 km/s522 kmView →
2026-10-21 11:034.35 km Final forecast0.01 km/s522 kmView →
2026-10-21 09:281.90 km Final forecast0.00 km/s522 kmView →
2026-10-21 07:52545 m Final forecast0.00 km/s522 kmView →
2026-10-21 04:00372 m Final forecast0.00 km/s513 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 Nothing is overwritten: a withdrawn forecast keeps its figure, with the newer check beside it, and the best estimate after the pass is a row of its own.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 14:29 UTC10.31 km Best estimate21 Oct 14:13 UTC21 Oct 12:49 UTCBest estimate
21 Oct 13:06 UTC9.30 km Forecast21 Oct 14:13 UTC20 Oct 22:34 UTCScreen
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 — “REASON-1 ⟷ OBJECT CF: 9.30 km forecast, not re-confirmed”, https://orbitalradar.com/conjunction/100903-101093 (accessed 2026-10-25).
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