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HighProximity
United StatesTANAGER-2NORAD 100886 · launched Oct 2026Payload
4.33kmPredicted miss distance
GRECOPTISATNORAD 68418 · launched Mar 2026Payload
Final forecastFinal forecast, made 14 min before the pass.
After the passBest estimate, from the orbit data published nearest its time: 11.9 km at 31 Oct 06:36 UTC.
Closest approach31 Oct 202606:36 UTC
Relative speed12.48 km/sat the closest approach
Altitude516 kmlow Earth orbit
Last confirmed31 Oct06:22 UTC · final forecast
Track TANAGER-2Track OPTISATAll approaches
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US TANAGER-2 and GREC OPTISAT were predicted to reach a closest approach of 4.33 km at 2026-10-31 06:36 UTC, at a relative speed of 12.48 km/s. Final forecast, made 14 min before the pass. Best estimate after the pass, from the orbit data published nearest its time: 11.9 km at 31 Oct 06:36 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.

The Two Objects

Dossiers from the satellite directory
TANAGER-2Payload
NORAD 100886
CountryUS
Launched2026-10-01
OrbitLEO · 506 × 509 km
COSPAR2026-227D
Maneuver capableUnknown
Profile →Globe →
OPTISATPayload
NORAD 68418
CountryGREC
Launched2026-03-30
OrbitLEO · 503 × 508 km
COSPAR2026-067C
Maneuver capableUnknown
Profile →Globe →

Where This Happens

Altitude context
DEBRIS BELT 700–1000 KM2006001,0001,5002,000 kmTHIS PASS · 516 KMISS 420Starlink 550

At 516 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 · TANAGER-2 ⟷ OPTISAT
2026-10-31 07:233.21 km Final forecast12.51 km/s499 kmView →
2026-10-31 06:364.33 km Final forecast12.48 km/s516 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
3 Nov 18:45 UTC11.88 km Best estimate31 Oct 06:36 UTC1 Nov 03:35 UTCBest estimate
31 Oct 03:42 UTC4.33 km Forecast31 Oct 06:36 UTC30 Oct 18:45 UTCRe-check
30 Oct 21:09 UTC4.76 km Forecast31 Oct 06:36 UTC30 Oct 14:45 UTCRe-check
30 Oct 18:32 UTC4.53 km Forecast31 Oct 06:36 UTC30 Oct 13:54 UTCRe-check
30 Oct 18:12 UTC8.25 km Forecast31 Oct 06:36 UTC30 Oct 13:54 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
3.14 km10-31 16:08 UTC
TANAGER-2ION SCV-026
3.15 km11-01 09:58 UTC
TANAGER-2MIKROGLOB-2
3.30 km11-03 22:35 UTC
TANAGER-2CAS500-2

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 →