IAU Symposium 348:
21st Century Astrometry: crossing the Dark and Habitable frontiers

August 28 – 31, 2018

    Scientific Rationale:

    Astrometry is facing new challenges and crossing new frontiers thanks to increased levels of precision and accuracy. Building on the ESA/Gaia space mission legacy, future space-astrometry mission proposals as Theia, GaiaNIR and Jasmine and relative astrometry measurements from non-astrometric missions and ground-instruments (HST, Euclid, JWST, WFIRST, Gravity, MICADO) will bring the faint Universe at our fingertips.

    The detection of ultra-faint dwarf galaxies and micro-arcsecond measurements of their internal kinematics will be ground-breaking for Dark Matter. The precision of next-generation astrometric infrastructures will probe the very nature of this elusive component of our Universe. In the near future, Gaia will reveal thousands of Jupiter-like exoplanets, and future sub-micro-arcsecond missions will enable complete detection-census and system characterization of Earth-mass planets in our nearest FGK stars habitable-zones, paving the way for exobiology missions. These measurements will also empower studies of Gravity, Inflation, of the matter behavior at Nature most extreme environments and the determination of H0 to unprecedented accuracy.

    At the commemorations of IAU 100th anniversary and just after the Gaia DR2, the first all-sky micro-arcsecond proper-motion and parallax dataset, this timely Symposium will join different communities to foster bridges. Inheriting from Astrometry past, anchored to its promising present, and with a sharp-eye towards its exciting future, it will lay down paths to address together some of the most profound questions of modern Science. What is Dark Matter? Is there life elsewhere in the Universe?


    • Dwarf Galaxies: internal dynamics of Milky Way companions
    • HVS: probing the triaxiality of the Milky Way DM Halo
    • Disc perturbations due to DM clumps
    • Exoplanet detection: from long period Jupiters to Habitable Exo-earths
    • Exoplanet characterization: dynamics, chaos and orbital determination
    • Astrometric signatures of Black Holes: microlensing, shadows, hot-spots, and gravitational effects
    • Equation of state of NS: probing the most extreme states of matter
    • Trigonometric parallaxes for H0 determination: Cepheids, RR-Lyraes and other steps of the distance ladder
    • New astrometric instruments and technologies: space mission concepts and ground based astrometry in the age of the ELTs
    • Modern Statistical Methods for astrophysical information extraction from Astrometric data: signal processing, bayesian methods, optimization strategies






    • Alain Leger, CNRS/IAS, France (co-chair)
    • Alessandro Sozzetti, INAF, Italy (co-chair)
    • Alberto Krone-Martins, Universidade de Lisboa, Portugal (co-chair)
    • Anne Lemaître, Université de Namur, Belgium
    • Barbara McArthur, University of Texas Austin, USA
    • Catherine Turon, Observatoire de Paris Meudon, France
    • Celine Boehm, Durham University, UK (co-chair)
    • David Spergel, Simons Center for Comp. Astrophysics & Princeton University, USA
    • François Mignard, Observatoire de la Côte d'Azur, France
    • Jill Tarter, SETI Institute, USA
    • John Tomsick, University of California, Berkeley, USA
    • Mariateresa Crosta, INAF Osservatorio Astrofisico di Torino, Italy
    • Norio Narita, National Astronomical Observatory of Japan, Japan
    • Torsten Ensslin, Max-Planck-Institut für Astrophysik, Germany
    • Yanxia Zhang, NAO Chinese Academy of Sciences, China



    Alberto Krone Martins 


    Link to External Website:


    XXX IAU General Assembly | ACV - Austria Center Vienna  | Bruno-Kreisky-Platz 1  | 1220 Vienna