Home›Maneuver Tracker›Close Approaches›COSMOS 2074 ⟷ SL-8 R/B
MediumProximity
RussiaCOSMOS 2074NORAD 20577 · launched Apr 1990Military payload
6.25kmPredicted miss distance
RussiaSL-8 R/BNORAD 11327 · launched Apr 1979Rocket body
Live forecastConfirmed by the latest screening, 22 Oct 16:23 UTC.
Closest approach23 Oct 202611:47 UTC
Relative speed10.45 km/sat the closest approach
Altitude975 kmlow Earth orbit
Separation now—live
Track COSMOS 2074Track SL-8 R/BAll approaches
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RU COSMOS 2074 and RU SL-8 R/B are predicted to reach a closest approach of 6.25 km at 2026-10-23 11:47 UTC, at a relative speed of 10.45 km/s. Confirmed by the latest screening, 22 Oct 16:23 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 2074Payload
NORAD 20577
CountryCIS
Launched1990-04-20
OrbitLEO · 963 × 1,001 km
COSPAR1990-036A
Maneuver capableUnknown
Profile →Globe →
SL-8 R/BR/B
NORAD 11327
CountryCIS
Launched1979-04-11
OrbitLEO · 954 × 994 km
COSPAR1979-030B
Maneuver capableNo
Spent rocket stage: uncontrolled, tracked by the public catalogue.
Profile →Globe →

Where This Happens

Altitude context
DEBRIS BELT 700–1000 KM2006001,0001,5002,000 kmTHIS PASS · 975 KMISS 420Starlink 550

At 975 km this pass sits inside the most congested band in low Earth orbit, home to the debris left by the 2007 ASAT test and the 2009 collision. 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

1 predicted pass under 10 km
Pair history · COSMOS 2074 ⟷ SL-8 R/B
2026-10-23 11:476.25 km Live forecast10.45 km/s975 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
22 Oct 12:43 UTC6.27 km Forecast23 Oct 11:47 UTC22 Oct 04:58 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
1.47 km10-23 03:16 UTC
COSMOS 2074NIMBUS 2 DEB
4.00 km10-22 22:48 UTC
COSMOS 2074SL-8 R/B
5.62 km10-20 17:52 UTC
COSMOS 2074RAPTOR2

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 2074 ⟷ SL-8 R/B: 6.25 km predicted close approach”, https://orbitalradar.com/conjunction/11327-20577 (accessed 2026-10-22).