G. Bourda
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View article: Establishing celestial reference frames at different ranges of wavelengths",
Establishing celestial reference frames at different ranges of wavelengths", Open
The current fundamental celestial reference frame is the second realization of the International Celestial Reference Frame (ICRF2) derived from dual frequency VLBI observations at 13/3.6 cm. The ICRF2 catalog includes ∼3000 compact radio s…
View article: Proceedings of the 19th European VLBI for Geodesy and Astrometry Working Meeting
Proceedings of the 19th European VLBI for Geodesy and Astrometry Working Meeting Open
The Laboratoire d'Astrophysique de Bordeaux (LAB) from the University of Bordeaux, France, hosted the 19th European VLBI for Geodesy and Astrometry (EVGA) Working Meeting on March 24-25, 2009. The purpose of the EVGA meeting is to report t…
View article: The third realization of the International Celestial Reference Frame by very long baseline interferometry
The third realization of the International Celestial Reference Frame by very long baseline interferometry Open
A new realization of the International Celestial Reference Frame (ICRF) is presented based on the work achieved by a working group of the International Astronomical Union (IAU) mandated for this purpose. This new realization follows the in…
View article: Gaia Data Release 2: The astrometric solution
Gaia Data Release 2: The astrometric solution Open
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 des…
View article: <i>Gaia</i> Data Release 2
<i>Gaia</i> Data Release 2 Open
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 the first 22 months of its operational pha…
View article: <i>Gaia</i>Data Release 1
<i>Gaia</i>Data Release 1 Open
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…
View article: Gaia Data Release 1: The reference frame and the optical properties of ICRF sources
Gaia Data Release 1: The reference frame and the optical properties of ICRF sources Open
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…
View article: <i>Gaia</i>Data Release 1
<i>Gaia</i>Data Release 1 Open
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 bri…
View article: Gaia Data Release 1: Astrometry - one billion positions, two million proper motions and parallaxes
Gaia Data Release 1: Astrometry - one billion positions, two million proper motions and parallaxes Open
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 bri…
View article: Gaia Data Release 1, Pre-processing and source list creation
Gaia Data Release 1, Pre-processing and source list creation Open
The first data release from the Gaia mission contains accurate positions and magnitudes for more than a billion sources, and proper motions and parallaxes for the majority of the 2.5~million Hipparcos and Tycho-2 stars. We describe three e…
View article: <i>Gaia</i>Data Release 1
<i>Gaia</i>Data Release 1 Open
Context. The first data release from the Gaia mission contains accurate positions and magnitudes for more than a billion sources, and proper motions and parallaxes for the majority of the 2.5 million Hipparcos and Tycho-2 stars.
View article: IVS OBSERVATION OF ICRF2-GAIA TRANSFER SOURCES
IVS OBSERVATION OF ICRF2-GAIA TRANSFER SOURCES Open
The second realization of the International Celestial Reference Frame (ICRF2), which is the current fundamental celestial reference frame adopted by the International Astronomical Union, is based on Very Long Baseline Interferometry (VLBI)…
View article: The ICRF-3: Status, plans, and progress on the next generation International Celestial Reference Frame
The ICRF-3: Status, plans, and progress on the next generation International Celestial Reference Frame Open
The goal of this presentation is to report the latest progress in creation of the next generation of VLBI-based International Celestial Reference Frame, ICRF3. Two main directions of ICRF3 development are improvement of the S/X-band frame …
View article: The X/Ka Celestial Reference Frame
The X/Ka Celestial Reference Frame Open
An X/Ka-band (8.4/32 GHz) celestial reference frame has been constructed using single baselines from the combined NASA and ESA Deep Space Networks for approximately 100 sessions each of ∼24-hour duration. The frame solution has dramaticall…
View article: The IVS data input to ITRF2014
The IVS data input to ITRF2014 Open
Very Long Baseline Interferometry (VLBI) is a primary space-geodetic technique for determining precise coordinates on the Earth, for monitoring the variable Earth rotation and orientation with highest precision, and for deriving many other…