RELATIVISTIC ASTROMETRY: THE RAMOD PROJECT

摘要

The technology of modern astrometric satellites like Gaia assures an accuracy of one microarcsecond in the measurements of angles. At this level, one also has to take into account the general relativistic effects due to most of the Solar System planets and their largest satellites. The aim of the RAMOD project is the construction of a fully general relativistic data reduction scheme consistent with these expectations. The project consists of the development of subsequent models having increasing accuracies and complications. Each model has been used as a testbed for comparison with the successively more advanced models. Here we illustrate only some of the problems already solved or presently under investigation for the fulfillment of our task.