49271 · COSMOS 1408 DEB
debris — Nudol ASAT test, 2021
Orbit
Apogee662km
Perigee441km
Inclination82.6°
RCS0.011m²
Characterization
- Object type
- debris
- Origin
- Nudol ASAT test, 2021
- Radar cross-section
- 0.011 m²
- Active conjunctions
- 1
Derived elements
two-body · vis-viva
Semi-major axis6929.6km
Eccentricity0.01595
Period95.68min
Mean motion15.0500rev/day
Velocity at perigee7.706km/s
Velocity at apogee7.464km/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-0.9605deg/day
Apsidal rotation-3.4195deg/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 age3.6h
Observation arc2.9d
Inferred mass2.34kg
Ballistic coeff.96.8kg/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-4455 | OG-4Sentinel-B | T−58:24:00 | 3.420 | 11.38 | 8.0×10−6 |
Spacecraft: OG-4