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Observational Data

DSS 14 at Goldstone
DSS-14 70 m radio telelscope

The creation of modern ephemerides involves the fitting to a wide variety of astronomical measurements (observations). The links below provide access to obsverations currently being used in creation and improvement of modern planetary, planetary satellite, and small-body ephemerides.

Planets

The Planetary Observational Data page provides access to observational data used in the creation and improvement of the JPL planetary and lunar ephemerides.

Planetary Satellites

The Planetary Satellite Observational Data page provides access to observational data used in the creation and improvement of the JPL planetary satellite ephemerides.

Small Bodies

For small bodies, optical astrometry is available from the Minor Planet Center and radar astrometry is available on this site.