30291 · FENGYUN 1C DEB
debris — FY-1C ASAT test, 2007
Orbit
Apogee891km
Perigee534km
Inclination98.7°
RCS0.021m²
Characterization
- Object type
- debris
- Origin
- FY-1C ASAT test, 2007
- Radar cross-section
- 0.021 m²
- Active conjunctions
- 1
Derived elements
two-body · vis-viva
Semi-major axis7090.6km
Eccentricity0.02517
Period99.03min
Mean motion14.5404rev/day
Velocity at perigee7.689km/s
Velocity at apogee7.311km/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 regression1.0417deg/day
Apsidal rotation-3.0495deg/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 age0.5h
Observation arc5.8d
Inferred mass6.18kg
Ballistic coeff.133.8kg/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-4468 | OG-3Sentinel-A | T−21:48:00 | 0.884 | 10.94 | 8.6×10−5 |
Spacecraft: OG-3