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The IAU Commission 4 Working Group on Standardizing Access to Ephemeridesrecommends the use of the Spacecraft and Planet Kernel (SPK) format as astandard format for the position ephemerides of planets and other natural solarsystem bodies, and the use of the Planetary Constants Kernel (PCK) format forthe orientation of these bodies. It further recommends that other supportingdata be stored in a text PCK. These formats were developed for use by the SPICEToolkit by the Navigation and Ancillary Information Facility of NASA's JetPropulsion Laboratory (JPL). The CALCEPH library developed by the Institut demecanique celeste de calcul des ephemerides (IMCCE) is also able to make use ofthese files. High accuracy ephemerides available in files conforming to the SPKand PCK formats include: the Development Ephemerides (DE) from JPL, IntegrateurNumerique Planetaire de l'Observatoire de Paris (INPOP) from IMCCE, and theEphemerides Planets and the Moon (EPM), developed by the Institute for AppliedAstronomy (IAA). The bulk of this report is a description of the portion of PCKand SPK formats required for these ephemerides. New SPK and PCK data types,both called Type 20: Chebyshev (Velocity Only), have been added. Other changesto the specification are (i) a new object identification number for coordinatetime ephemerides and (ii) a set of three new data types that use the TCB ratherthan the TDB time scale for the ephemerides, but are otherwise identical totheir TDB versions.

Report of the IAU Commission 4 Working Group on Standardizing Access to Ephemerides and File Format Specification