Home›Maneuver Tracker›Close Approaches›TANAGER-2 ⟷ ALISIO-1
high · PROXIMITY
US TANAGER-2SPN ALISIO-1
3.23 kmpredicted miss distance
Final forecastFinal forecast, made 10 min before the pass.
After the passBest estimate, from the orbit data published nearest its time: 5.14 km at 20 Oct 21:21 UTC.
Predicted closest approach
2026-10-20 21:21 UTC
Relative speed
0.46 km/s
Altitude
506 km
Last confirmed
20 Oct 21:12 UTC
Track TANAGER-2 →Track ALISIO-1 →All approaches →
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US TANAGER-2 and SPN ALISIO-1 were predicted to reach a closest approach of 3.23 km at 2026-10-20 21:21 UTC, at a relative speed of 0.46 km/s. Final forecast, made 10 min before the pass. Best estimate after the pass, from the orbit data published nearest its time: 5.14 km at 20 Oct 21:21 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 · 512 × 516 km
COSPAR2026-227D
Maneuver capableUnknown
Profile →Globe →
ALISIO-1Payload
NORAD 58562
CountrySPN
Launched2023-12-01
OrbitLEO · 509 × 516 km
COSPAR2023-185M
Maneuver capableUnknown
Profile →Globe →

Where This Happens

Altitude context
DEBRIS BELT 700–1000 KM2006001,0001,5002,000 kmTHIS PASS · 506 KMISS 420Starlink 550

At 506 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 ⟷ ALISIO-1
2026-10-20 21:213.23 km Final forecast0.46 km/s506 kmShown above
2026-10-20 20:346.61 km Final forecast0.46 km/s520 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
22 Oct 21:24 UTC5.14 km Best estimate20 Oct 21:21 UTC20 Oct 22:45 UTCBest estimate
20 Oct 15:52 UTC3.23 km Forecast20 Oct 21:21 UTC20 Oct 10:45 UTCRe-check
20 Oct 12:32 UTC3.24 km Forecast20 Oct 21:21 UTC20 Oct 08:45 UTCRe-check
20 Oct 12:13 UTC3.17 km Forecast20 Oct 21:21 UTC20 Oct 04:45 UTCRe-check

These Objects Elsewhere

Other screened approaches · 7 days
815 m10-22 19:16 UTC
TANAGER-2 4004OBJECT J
1.58 km10-20 22:01 UTC
TANAGER-2OBJECT CR
1.87 km10-21 17:58 UTC
TANAGER-2 4004CONNECTA IOT-13

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 — “TANAGER-2 ⟷ ALISIO-1: 3.23 km predicted close approach”, https://orbitalradar.com/conjunction/100886-58562 (accessed 2026-10-23).