Satellite Conjunction Archive
The permanent record of notable close approaches between objects in orbit, kept since June 2026. Orbital Radar's conjunction screening checks 1,200 strategic satellites against the full public catalogue every 20 minutes: encounters that matter (cross-border passes, military payloads, watchlist objects) are retained here permanently, each with its own analysis page. New to the topic? Start with what a conjunction is. For live traffic, filters and search, use the Satellite Maneuver Tracker.
Closest cross-border encounters on record
Payload passes between objects of different countries, ranked by miss distance. These records never expire.
Notable encounters, last 30 days
The latest cross-border, military and high-severity traffic. New encounters land here within one 20-minute screening cycle.
Reading this archive
What is this archive?
It is the permanent record of notable close approaches detected by Orbital Radar's continuous conjunction screening, which checks 1,200 strategic satellites against the full public catalogue every 20 minutes. Routine encounters age out after 7 days; notable ones are retained permanently.
What makes an encounter notable?
A pass is kept permanently when it is cross-border (the two objects belong to different countries), reaches high or critical severity, or involves a satellite on the strategic watchlist. Each notable encounter keeps its own analysis page at a stable address.
How close is dangerous?
Screening flags passes predicted inside 10 km. Under 5 km is close by operational standards, and under 1 km is exceptional. Published orbital elements carry kilometre-scale uncertainty, so these figures describe close passes, not collision predictions.
Why do some forecasts say "not re-confirmed" or "withdrawn"?
Every figure here is a forecast computed from published orbital elements, and each pass is re-checked every 20 minutes until its time comes. When newer elements show the pass is gone, for example after one of the satellites maneuvers, the forecast is marked withdrawn: it keeps its page and its original figure, with the newer check beside it. "Not re-confirmed" means the screening could not re-confirm the figure close to its time: the record may predate these re-checks, or the newest orbit data could not confirm it. About two days after a pass, a best estimate from the orbit data published nearest its time is added beside the forecast, without replacing it.
Why are some severities shown in neutral grey?
Colour is reserved for strategically significant traffic: cross-border passes, military payloads and watchlist objects. A close pass between two pieces of debris is shown in neutral tones because neither object can maneuver and no intent is involved.