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The JPL HORIZONS service provides access to ephemeris computation and orbital data for over 561,000 asteroids, 3,000 comets, 171 planetary satellites, 8 planets, and other solar system objects. It is maintained by the Jet Propulsion Laboratory's Solar System Dynamics Group for generating highly accurate positional predictions.
Data is accessed via the JPL HORIZONS web interface or Telnet service, not as a pre-packaged file. Users must be familiar with the service's query syntax to extract specific data.