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Gaia Data Release 2: The astrometric solution
Context. 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 theExpand
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Gaia Data Release 1 - Astrometry: one billion positions, two million proper motions and parallaxes
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 monthsExpand
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A Practical Relativistic Model for Microarcsecond Astrometry in Space
We develop a practical model for relativistic reduction of positional observations with an accuracy of 1 μas, which is expected to be attained in future space astrometry missions. All relativisticExpand
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Gaia Data Release 1 - Reference frame and optical properties of ICRF sources
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 selectedExpand
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We discuss the IAU resolutions B1.3, B1.4, B1.5, and B1.9 that were adopted during the 24th General Assembly in Manchester, 2000, and provides details on and explanations for these resolutions. It isExpand
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Microarcsecond Astrometry in Space: Relativistic Effects and Reduction of Observations
The framework of General Relativity is applied to the problem of reduction of high-precision astrometric observations of the order of 1 μarcsec. Such precision is expected to be attained in the notExpand
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Gaia Data Release 2: Observational Hertzsprung-Russell diagrams
Context. Gaia Data Release 2 provides high-precision astrometry and three-band photometry for about 1.3 billion sources over the full sky. The precision, accuracy, and homogeneity of both astrometryExpand
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Analysis of astrometric catalogues with vector spherical harmonics
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 practicalExpand
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Gaia Data Release 2. The celestial reference frame (Gaia-CRF2)
Context. The second release of Gaia data (Gaia DR2) contains the astrometric parameters for more than half a million quasars. This set defines a kinematically non-rotating reference frame in theExpand
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Light propagation in the gravitational field of moving bodies by means of Lorentz transformation: I. Mass monopoles moving with constant velocities
We show how to derive the equations of light propagation in the gravitational field of uniformly moving mass monopoles without formulating and integrating the differential equations of lightExpand
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