For what specific task involving orbital mechanics are kilometers often preferred for precision?

Tracking satellites or calculating the orbital paths of the International Space Station (ISS).

Despite the prevalence of AU and light-years for cosmic scales, the kilometer unit maintains a vital foothold in scenarios requiring extreme precision over relatively short spans where the human scale of measurement has not completely collapsed. This is particularly true for objects operating in the immediate vicinity of Earth. For tracking satellites, determining the distance to the International Space Station (ISS), or calculating near-term asteroid threat trajectories, kilometers are essential. This preference stems from the fact that on-orbit telemetry data systems are frequently designed around SI base units, providing the necessary granularity and consistency for precise, short-term orbital modeling.