Home›Maneuver Tracker›Close Approaches›COSMOS 2464 (GLONASS) ⟷ SL-12 R/B(2)
MediumProximity
RussiaCOSMOS 2464 (GLONASS)NORAD 37139 · launched Sep 2010Military payload
6.40kmPredicted miss distance
RussiaSL-12 R/B(2)NORAD 21221 · launched Apr 1991Rocket body
Final forecastFinal forecast, made 8 min before the pass.
After the passBest estimate, from the orbit data published nearest its time: 6.40 km at 22 Oct 14:10 UTC.
Closest approach22 Oct 202614:10 UTC
Relative speed5.94 km/sat the closest approach
Altitude19,156 kmmedium Earth orbit
Last confirmed22 Oct14:02 UTC · final forecast
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RU COSMOS 2464 (GLONASS) and RU SL-12 R/B(2) were predicted to reach a closest approach of 6.40 km at 2026-10-22 14:10 UTC, at a relative speed of 5.94 km/s. Final forecast, made 8 min before the pass. Best estimate after the pass, from the orbit data published nearest its time: 6.40 km at 22 Oct 14:10 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 mattersOne side of this pass cannot maneuver, so any avoidance decision rests with the other operator. Screening continues as new element sets arrive.

The Two Objects

Dossiers from the satellite directory
COSMOS 2464 (GLONASS)Payload
NORAD 37139
CountryCIS
Launched2010-09-02
OrbitMEO · 19,040 × 19,220 km
COSPAR2010-041C
Maneuver capableUnknown
Profile →Globe →
SL-12 R/B(2)R/B
NORAD 21221
CountryCIS
Launched1991-04-04
OrbitMEO · 19,083 × 19,166 km
COSPAR1991-025E
Maneuver capableNo
Spent rocket stage: uncontrolled, tracked by the public catalogue.
Profile →Globe →

Where This Happens

Altitude context
GEO BELT 35,786 KMTHIS PASS · 19,156 KMLEOMEOGEO

This pass happens near the geostationary belt, where satellites hold fixed longitude slots and relative speeds are low. Close approaches here are usually slow drifts rather than crossing passes. About GEO →

History Between This Pair

1 predicted pass under 10 km
Pair history · COSMOS 2464 (GLONASS) ⟷ SL-12 R/B(2)
2026-10-22 14:106.40 km Final forecast5.94 km/s19,156 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
24 Oct 14:29 UTC6.40 km Best estimate22 Oct 14:10 UTC22 Oct 06:41 UTCBest estimate
22 Oct 11:50 UTC6.40 km Forecast22 Oct 14:10 UTC22 Oct 06:41 UTCRe-check
22 Oct 08:04 UTC6.33 km Forecast22 Oct 14:10 UTC21 Oct 19:31 UTCRe-check
22 Oct 02:04 UTC6.28 km Forecast22 Oct 14:10 UTC21 Oct 13:56 UTCRe-check
21 Oct 20:04 UTC6.31 km Forecast22 Oct 14:10 UTC21 Oct 06:15 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
9.88 km10-25 21:48 UTC
COSMOS 2276 (GLONASS)SL-12 R/B(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 →

Cite this encounter: Orbital Radar — “COSMOS 2464 (GLONASS) ⟷ SL-12 R/B(2): 6.40 km predicted close approach”, https://orbitalradar.com/conjunction/21221-37139 (accessed 2026-10-25).