Limitations of the Planetary Ephemerides

Details Limitations of the Planetary Ephemerides Limitations of the Planetary Ephemerides

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999dda....31.1101s&link_type=abstract

American Astronomical Society, DDA meeting #31, #11.01

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The solar system may be regarded as the premier classical dynamical system of all time. It has been observed the longest; it is one of the most accurately measured; it is relatively clean - hardly any dust, friction, or static; and it has been undisturbed over the many years. The ephemerides of the solar system have had many uses, often requiring the utmost accuracy: spacecraft navigation, reductions of observations, and testing of relativity and alternate theories of gravity. There are, however, a couple of features which limit the ephemerides: perturbations from many asteroids whose masses are unknown, and friction between the lunar core and mantle. These features are described - their implications for the ephemerides, how they are handled during the ephemeris improvement process, and their resulting limitations upon the ephemeris accuracy.

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