In this paper we present results of a study of the distribution of errors in the positions predicted by a Special Perturbations orbit propagator for a population of 14 low-earth orbiting satellites. In our study we performed differential corrections and generated ephemerides using data acquired from the US space surveillance network under a high tasking protocol. Errors in the along-track, radial and cros-track directions were extracted by aligning and combining 72-hour ephemerides calculated sequentially for periods of time spanning several months for each satellite. The along-track errors dominate and, together with the radial errors, increase uniformly in time. The growth rate for the along-track errors is correlated with the decay rate of the semi-major axis and the growth rate for the radial errors is correlated with eccentricity.
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