Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.p22d..03s&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #P22D-03
Astronomy and Astrophysics
Astronomy
6200 Planetology: Solar System Objects (New Field), 6299 General Or Miscellaneous
Scientific paper
Prior to 1976 there was neither a uniform system for planetary coordinates nor agreed values for rotational elements and coordinates. So in 1976 The International Astronomical Union (IAU) established a Working Group with Mert Davies as the chairman. Its first report in 1979 gave the guiding principles, conventions, and the rationale for their acceptance along with appendices with the initial values. Since then, with the additional sponsorship of the International Association of Geodesy(IAG), every three years the Working Group has produced a report giving the updated values based primarily on the results of space missions and some ground based observations. For twenty years Mert Davies was chairman of the Working Group and, through his participation on space mission teams, was a principal source of coordinate systems for planets and satellites, based on the imaging of the various bodies. The triennial reports, published in Celestial Mechanics and Dynamical Astronomy, are the source of standard data for use by space missions, ground based observations, research, and publications. Now the report includes for the planets, satellites, and selected asteroids, the location and motions of their poles, the rotation of a prime meridian, and the size and shape parameters. Presently, the asteroids are selected based on those with radar or space mission observations, instead of just photometric observations. The reports continue to be updated and new material added, with the Working Group membership composed of the people active in the determination of data and the author of this paper having replaced Mert Davies as chairman in 1997.
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