34454 · COSMOS 2251 DEB
debris — Iridium–Cosmos collision, 2009
Orbit
Apogee812km
Perigee498km
Inclination74.0°
RCS0.032m²
Characterization
- Object type
- debris
- Origin
- Iridium–Cosmos collision, 2009
- Radar cross-section
- 0.032 m²
- Active conjunctions
- 1
Derived elements
two-body · vis-viva
Semi-major axis7033.1km
Eccentricity0.02232
Period97.83min
Mean motion14.7190rev/day
Velocity at perigee7.698km/s
Velocity at apogee7.362km/s
LEO · computed from the catalogued apsides with μ = 398600.4418 km³/s² and R⊕ = 6378.137 km (WGS-84).
Secular perturbations
J2 oblateness
Nodal regression-1.9526deg/day
Apsidal rotation-2.1964deg/day
Ω̇ node · ω̇ argument of perigee, secular rates from the J2 term.
J2 is the dominant perturbation at this altitude. The plane precesses relative to the fleet's, so the encounter geometry walks through the catalogue rather than repeating.
Orbit determination
special perturbations
PropagatorSP
Epoch age0.2h
Observation arc6.5d
Inferred mass11.63kg
Ballistic coeff.165.2kg/m²
- Covariance delivered
- full 6x6
Special-perturbations fit — numerically integrated against a full force model, delivered with a covariance the screening pipeline can use directly.
Conjunctions against the fleet
1 active
| Event | Primary | TCA | Miss km | Rel vel km/s | Pc |
|---|---|---|---|---|---|
| CJ-4471 | OG-2Meridian-2 | T−09:13:48 | 0.412 | 14.81 | 4.6×10−4 |
Spacecraft: OG-2