Planetary Ephemeris Data

The creation of modern ephemerides involves the fitting to a wide variety of astronomical measurements (observations).
This website presents the sets of observations that are currently being used in creation and improvement of modern planetary and lunar ephemerides.

This page is currently maintained by

Present Home Page for the IAU Commission 4 (Ephemerides) : "http://iaucom4.org/ephemerides.html"


Meridian Circle Timings (Transits)


Photographic Astrometry of outer planets and satellites


Photographic Astrometry of Pluto


CCD Astrometry of the Outer Planets and Satellites


Astrolabe Observations


Radar Ranging


Spacecraft encounter estimates

* Spacecraft 3-D Observations * Format


Spacecraft VLBI


Venus Spacecraft Doppler


Mars Spacecraft Ranging

Mars Spacecraft Doppler (Differenced Range)


Cassini Spacecraft Range


DSN Station Locations


Lunar Laser Ranging


Contact: Webmaster (william.folkner@jpl.nasa.gov)

Last modified: 2012 October 09