S. Klioner

The Gaia astrometric catalogue and secular aberration drift in proper motions

A. G. A. Brown, U. Bastian, S. Klioner

Context. A recent paper demonstrated the existence of a secular aberration drift term in stellar proper motions that arises when transforming an astrometric catalogue defined for an observer at rest with respect to the Solar System barycentre to some other reference frame …

nl, de (code pays fourni par la source)

Theia: Faint objects in motion or the new astrometry frontier

A. Krone-Martins, A. Amorim, G. Anglada‐Escudé, A. Brandeker et autres

In the context of the ESA M5 (medium mission) call we proposed a new satellite mission, Theia, based on relative astrometry and extreme precision to study the motion of very faint objects in the Universe. Theia is primarily designed to study the …

fr (code pays fourni par la source)

GaiaData Release 1

François Mignard, S. Klioner, L. Lindegren, U. Bastian et autres

Context. As part of the data processing for Gaia Data Release 1 (Gaia DR1) a special astrometric solution was computed, the so-called auxiliary quasar solution. This gives positions for selected extragalactic objects, including radio sources in the second realisation of the International …

fr, de, se, es, us, ch, br (code pays fourni par la source)

Gaia Data Release 1: Astrometry - one billion positions, two million proper motions and parallaxes

L. Lindegren, U. Lammers, U. Bastian, J. Hernández et autres

Gaia Data Release 1 (Gaia DR1) contains astrometric results for more than 1 billion stars brighter than magnitude 20.7 based on observations collected by the Gaia satellite during the first 14 months of its operational phase. We give a brief overview of …

Analysis of astrometric catalogues with vector spherical harmonics

F. Mignard, S. Klioner

Aims. We compare stellar catalogues with position and proper motion components using a decomposition on a set of orthogonal vector spherical harmonics. We aim to show the theoretical and practical advantages of this technique as a result of invariance properties and the …

fr, de (code pays fourni par la source)

Astrodynamical Space Test of Relativity Using Optical Devices I (ASTROD I)—A class-M fundamental physics mission proposal for Cosmic Vision 2015–2025

T. Appourchaux, Raymond Burston, Yanbei Chen, M Cruise et autres

ASTROD I is a planned interplanetary space mission with multiple goals. The primary aims are: to test general relativity with an improvement in sensitivity of over three orders of magnitude, improving our understanding of gravity and aiding the development of a new …

fr, de, us, gb, es, cn, au (code pays fourni par la source)

Gaia Data Release 2. The astrometric solution

L. Lindegren, J. Hernández, A. Bombrun, S. Klioner et autres

Gaia Data Release 2 (Gaia DR2) contains results for 1693 million sources in the magnitude range 3 to 21 based on observations collected by the European Space Agency Gaia satellite during the first 22 months of its operational phase. We describe the …