Home›Maneuver Tracker›Close Approaches›ISS (ZARYA) ⟷ NEMO-HD
HighProximity
On permanent record
RussiaISS (ZARYA)NORAD 25544 · launched Nov 1998Military payload
4.37kmPredicted miss distance
SVNNEMO-HDNORAD 46277 · launched Sep 2020Payload
Live forecastConfirmed by the latest screening, 21 Oct 22:45 UTC.
Closest approach22 Oct 202611:48 UTC
Relative speed7.11 km/sat the closest approach
Altitude422 kmlow Earth orbit
Separation now—live
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RU ISS (ZARYA) and SVN NEMO-HD are predicted to reach a closest approach of 4.37 km at 2026-10-22 11:48 UTC, at a relative speed of 7.11 km/s. Confirmed by the latest screening, 21 Oct 22:45 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
ISS (ZARYA)Payload
NORAD 25544
CountryCIS
Launched1998-11-20
OrbitLEO · 415 × 424 km
COSPAR1998-067A
Maneuver capableYes
International Space Station, debris avoidance maneuvers tracked
Profile →Globe →
NEMO-HDPayload
NORAD 46277
CountrySVN
Launched2020-09-03
OrbitLEO · 425 × 427 km
COSPAR2020-061F
Maneuver capableUnknown
Profile →Globe →

Where This Happens

Altitude context
DEBRIS BELT 700–1000 KM2006001,0001,5002,000 kmTHIS PASS · 422 KMISS 420Starlink 550

At 422 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

1 predicted pass under 10 km
Pair history · ISS (ZARYA) ⟷ NEMO-HD
2026-10-22 11:484.37 km Live forecast7.11 km/s422 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 Nothing is overwritten: a withdrawn forecast keeps its figure, with the newer check beside it, and the best estimate after the pass is a row of its own.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
21 Oct 19:30 UTC4.37 km Forecast22 Oct 11:48 UTC22 Oct 00:02 UTCRe-check
21 Oct 13:30 UTC6.31 km Forecast22 Oct 11:48 UTC21 Oct 18:02 UTCRe-check
21 Oct 12:26 UTC7.24 km Forecast22 Oct 11:48 UTC21 Oct 12:02 UTCRe-check
21 Oct 12:06 UTC7.29 km Forecast22 Oct 11:48 UTC21 Oct 12:02 UTCScreen

These Objects Elsewhere

Other screened approaches · 7 days
5.79 km10-18 04:48 UTC
ISS (ZARYA)ENSHI XIDA SHANQUAN
7.83 km10-21 15:29 UTC
ISS (ZARYA)STARLINK-1403
8.69 km10-20 11:06 UTC
ISS (ZARYA)QUBE

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 — “ISS (ZARYA) ⟷ NEMO-HD: 4.37 km predicted close approach”, https://orbitalradar.com/conjunction/25544-46277 (accessed 2026-10-21).
✓ Permanent record. This encounter met the notability thresholds and keeps an archived page after the pass.