Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-10-30
A Giant Step: from Milli- to Micro-Arcsecond Astrometry ed. W. Jin. I. Platais. and M.A.C. Perryman (Cambridge University Pres
Astronomy and Astrophysics
Astrophysics
5 pages, 2 figures, 2 tables, presented to IAU Symposium No. 248, A Giant Step: from Milli- to Micro-Arcsecond Astrometry (Sha
Scientific paper
Deep-space laser ranging will be ideal for testing relativistic gravity, and mapping the solar-system to an unprecedented accuracy. ASTROD (Astrodynamical Space Test of Relativity using Optical Devices) and ASTROD I are such missions. ASTROD I is a mission with a single spacecraft; it is the first step of ASTROD with 3 spacecraft. In this talk, after a brief review of ASTROD and ASTROD I, we concentrate of the precision of solar astrodynamics that can be achieved together with implications on astrometry and reference frame transformations. The precision planetary ephemeris derived from these missions together with second post-Newtonian test of relativistic gravity will serve as a foundation for future precise astrometry observations. Relativistic frameworks are discussed from these considerations.
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