ESA SST
radar · European sensor network
Last delivery3h 34m
Expected cadence2h 00m
Objects tracked6,108
Observations 24h42,000
Statecritical
Age against cadence178%
1h 34m past due. Estimates sourced here are ageing faster than they are being refreshed.
Observation and orbit determination
CCSDS CDM
Fit span60h
1σ position310m
Observations 24h42,000
Obs per object6.9
- Measurement types
- range · azimuth · elevation
- Delivered product
- CCSDS CDM
Radar tracks are weather-independent and give the tightest along-track covariance, which is why they dominate short-notice screening.
Range and angles constrain radial position well but leave along-track error to be inferred from arc length, so the covariance ellipsoid stays elongated along the velocity vector.
Conjunctions screened by this source
1 active
| Event | Primary | Secondary | TCA | Last CDM | CDMs | Pc |
|---|---|---|---|---|---|---|
| CJ-4455 | OG-4 | COSMOS 1408 DEB49271 | T−58:24:00 | 3h 34m ago | 7 | 8.0×10−6 |
Slowest encounter sourced here is 11.38 km/s (hypervelocity). Rectilinear-relative-motion assumption holds; 2-D analytic Pc is valid.