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Modern Geometric Methods of Distance Determination

Pietrzyński, Grzegorz; Thévenin, Frédéric; Falanga, Maurizio +2 more

Building a 3D picture of the Universe at any distance is one of the major challenges in astronomy, from the nearby Solar System to distant Quasars and galaxies. This goal has forced astronomers to develop techniques to estimate or to measure the distance of point sources on the sky. While most distance estimates used since the beginning of the 20t…

Data Timing, Time Transfer and On-board Clock Monitoring for Space Astrometry with Gaia

Butkevich, Alexey G.; Klioner, Sergei A.; Geyer, Robin +1 more

The paper discusses the problematic of data timing in the framework of the space astrometry mission Gaia. For various reasons related both to astrometry and to the measuring principles of the Gaia instrument it is mandatory to assign a highly stable and accurate time tag for each observational point. For this purpose Gaia has a Rb clock on board. …