99214 · UNCHARACTERIZED OBJECT
unknown — Unattributed — 3 optical tracks
Orbit
Characterization
- Object type
- unknown
- Origin
- Unattributed — 3 optical tracks
- Radar cross-section
- uncharacterized
- Active conjunctions
- 1
No radar cross-section on file. Area-to-mass ratio is unmodelled, which is why any Pc estimate against this object carries a wide confidence band.
Derived elements
LEO · computed from the catalogued apsides with μ = 398600.4418 km³/s² and R⊕ = 6378.137 km (WGS-84).
Secular perturbations
Ω̇ node · ω̇ argument of perigee, secular rates from the J2 term.
The node regresses at 0.9856 deg/day, so this orbit is sun-synchronous — its geometry against the fleet's own sun-synchronous planes repeats rather than drifting apart, which is why repeat conjunctions with this object are common.
Orbit determination
- Covariance delivered
- none
General-perturbations fit — an SGP4 mean-element set. The analytic theory carries no formal covariance, so screening substitutes a modelled one and the resulting Pc is correspondingly softer. With no radar cross-section on file, neither mass nor drag response can be inferred at all — the covariance is a floor assumption, not a measurement.
Conjunctions against the fleet
| Event | Primary | TCA | Miss km | Rel vel km/s | Pc |
|---|---|---|---|---|---|
| CJ-4451 | OG-5Halcyon | T−64:00:00 | 0.960 | 8.72 | 3.3×10−5 |
Spacecraft: OG-5