18 SDS · Space-Track
radar · Global SSN
Last delivery46m
Expected cadence8h 00m
Objects tracked47,214
Observations 24h1,240,000
Statenominal
Age against cadence10%
90% of the delivery interval remaining.
Observation and orbit determination
CCSDS CDM + TLE (GP)
Fit span72h
1σ position250m
Observations 24h1,240,000
Obs per object26.3
- Measurement types
- range · azimuth · elevation
- Delivered product
- CCSDS CDM + TLE (GP)
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
2 active
| Event | Primary | Secondary | TCA | Last CDM | CDMs | Pc |
|---|---|---|---|---|---|---|
| CJ-4474 | OG-1 | SL-16 R/B DEB23705 | T−05:06:00 | 46m ago | 22 | 3.2×10−5 |
| CJ-4459 | OG-1 | IRIDIUM 33 DEB33759 | T−52:12:00 | 46m ago | 9 | 5.0×10−5 |
Slowest encounter sourced here is 12.07 km/s (hypervelocity). Rectilinear-relative-motion assumption holds; 2-D analytic Pc is valid.