17.09.2018

Light propagation in the Solar System for high-precision astrometry on the sub-microarcsecond level

Lichtablenkung (Symbolbild) © Light deflection (Symbolic picture) Lichtablenkung (Symbolbild) © Light deflection (Symbolic picture)
Lichtablenkung (Symbolbild)

© Light deflection (Symbolic picture)

One of the most fundamental issues in astrometry concerns the problem about how to trace the light rays received by an observer back to the celestial light sources. In order to
answer this question, one needs to determine the trajectories of light signals in the
curved space-time of the Solar System. The talk reports on recent advancement in the
theory  of light  propagation  aiming at the sub-micro-arcsecond level of astrometric accuracy. In particular, trajectories of light signals in the gravitational field of N Solar System bodies in  arbitrary   motion are determined in the post-Newtonian approach. In line with the recommendations  of  the  International  Astronomical  Union, harmonic coordinates  are used  and  the gravitational fields of the Solar System bodies are expressed in terms of their intrinsic mass-multipoles and spin-multipoles, allowing for arbitrary shape, inner structure, oscillations, and rotational motions of these bodies.
 

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Enrico Gerlach
Letzte Änderung: 17.09.2018