45657 · STARLINK-1436

payload — Starlink shell 1, 2020

All objects

Orbit

Apogee551km

Perigee544km

Inclination53.0°

RCS2.140m²

Characterization

Object type: payload
Origin: Starlink shell 1, 2020
Radar cross-section: 2.140 m²
Active conjunctions: 1

Derived elements

two-body · vis-viva

Semi-major axis6925.6km

Eccentricity0.00051

Period95.60min

Mean motion15.0631rev/day

Velocity at perigee7.590km/s

Velocity at apogee7.583km/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-4.4949deg/day

Apsidal rotation3.0283deg/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 age0.1h

Observation arc1.0d

Inferred mass6358.41kg

Ballistic coeff.1350.6kg/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-4462	OG-6Kestrel	T−40:30:00	2.030	2.41	9.5×10⁻⁶

Spacecraft: OG-6