F. Taris
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View article: Multi-band optical variability of a newly discovered twelve blazars sample from 2013-2019
Multi-band optical variability of a newly discovered twelve blazars sample from 2013-2019 Open
Here we present the first optical photometric monitoring results of a sample of twelve newly discovered blazars from the ICRF - Gaia CRF astrometric link. The observations were performed from April 2013 until August 2019 using eight telesc…
View article: Multiband optical variability of a newly discovered 12 blazars sample from 2013–2019
Multiband optical variability of a newly discovered 12 blazars sample from 2013–2019 Open
Here we present the first optical photometric monitoring results of a sample of 12 newly discovered blazars from the ICRF – Gaia CRF astrometric link. The observations were performed from April 2013 to August 2019 using eight telescopes lo…
View article: Quasars with large proper motions: A selection from the LQAC-5 catalogue combined with <i>Gaia</i> EDR3
Quasars with large proper motions: A selection from the LQAC-5 catalogue combined with <i>Gaia</i> EDR3 Open
Context. Thanks to the cross-identification between the Gaia EDR3 (E-Data Release 3) catalogue and the quasars’ compiled catalogue LQAC-5 (Large Quasar Astrometric Catalogue-5), accurate astrometric parameters as well as photometric measur…
View article: Parsec-scale alignments of radio-optical offsets with jets in AGNs from multifrequency geodetic VLBI, <i>Gaia</i> EDR3, and the MOJAVE program
Parsec-scale alignments of radio-optical offsets with jets in AGNs from multifrequency geodetic VLBI, <i>Gaia</i> EDR3, and the MOJAVE program Open
Aims. We aim to study the relative positions of quasar emission centers at different wavelengths in order to help link the various realizations of the International Celestial Reference System (ICRS), and to unveil systematic uncertainties …
View article: Potential asteroid discoveries by the ESA <i>Gaia</i> mission
Potential asteroid discoveries by the ESA <i>Gaia</i> mission Open
Context. Since July 2014, the Gaia mission of the European Space Agency has been surveying the entire sky down to magnitude 20.7 in the visible. In addition to the millions of daily observations of stars, thousands of Solar System objects …
View article: Gaia Early Data Release 3: The astrometric solution
Gaia Early Data Release 3: The astrometric solution Open
Gaia Early Data Release 3 (Gaia EDR3) contains results for 1.812 billion sources in the magnitude range G = 3 to 21 based on observations collected by the European Space Agency Gaia satellite during the first 34 months of its operational p…
View article: <i>Gaia</i>Early Data Release 3
<i>Gaia</i>Early Data Release 3 Open
Context. Gaia Early Data Release 3 ( Gaia EDR3) contains results for 1.812 billion sources in the magnitude range G = 3–21 based on observations collected by the European Space Agency Gaia satellite during the first 34 months of its operat…
View article: Potential asteroid discoveries by the ESA Gaia mission: Results from follow-up observations
Potential asteroid discoveries by the ESA Gaia mission: Results from follow-up observations Open
Since July 2014, the ESA Gaia mission has been surveying the entire sky down to magnitude 20.7 in the visible. In addition to the millions of stars, thousands of Solar System Objects (SSOs) are observed daily. By comparing their positions …
View article: The Fundamental Reference AGN Monitoring Experiment (FRAMEx)
The Fundamental Reference AGN Monitoring Experiment (FRAMEx) Open
The U.S. Naval Observatory (USNO), in collaboration with Paris Observatory (OP), is conducting the Fundamental Reference AGN Monitoring Experiment, or FRAMEx. FRAMEx will use USNO's and OP's in-house observing assets in the radio, infrared…
View article: Multiple black hole system in 4C31.61 (2201+315)
Multiple black hole system in 4C31.61 (2201+315) Open
Modeling trajectories of radio components ejected by the nucleus of 4C31.61 (2201+315) and observed by very long baseline interferometry (VLBI) in the frame of the MOJAVE survey suggests that they are ejected from three different origins t…
View article: Comparison of proper motions in declination for 387 <i>Gaia</i> DR2 and HIPPARCOS stars from ILS observations over many decades
Comparison of proper motions in declination for 387 <i>Gaia</i> DR2 and HIPPARCOS stars from ILS observations over many decades Open
Context. The second solution of the Gaia catalog, which has been available since April 2018, plays an important role in the realization of the future Gaia reference frame. Since 1997, the reference frame has been materialized by the optica…
View article: LQAC-5: The fifth release of the Large Quasar Astrometric Catalogue
LQAC-5: The fifth release of the Large Quasar Astrometric Catalogue Open
Context. In addition to their great astrophysical interest, quasars represent quasi-ideal reference objects in the celestial sphere with, a priori, a lack of significant proper motion. Since the fourth release of the Large Quasar Astrometr…
View article: LQAC-5: The fifth release of the Large Quasar Astrometric Catalogue
LQAC-5: The fifth release of the Large Quasar Astrometric Catalogue Open
Context. In addition to their great astrophysical interest, quasars represent quasi-ideal reference objects in the celestial sphere with, a priori, a lack of significant proper motion. Since the fourth release of the Large Quasar Astrometr…
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: LQAC-4: Fourth release of the Large Quasar Astrometric Catalogue
LQAC-4: Fourth release of the Large Quasar Astrometric Catalogue Open
Context. From an astrometric point of view, quasars constitute the best and almost ideal reference objects in the celestial sphere, with a priori no significant proper motion. Since the third release of the Large Quasar Astrometric Catalog…
View article: Variability of extragalactic sources: its contribution to the link between ICRF and the future<i>Gaia</i>Celestial Reference Frame
Variability of extragalactic sources: its contribution to the link between ICRF and the future<i>Gaia</i>Celestial Reference Frame Open
Context. The first release of the Gaia catalog is available since 14 September 2016. It is a first step in the realization of the future Gaia reference frame. This reference frame will be materialized by the optical positions of the source…
View article: Characterizing the astrometric precision limit for moving targets observed with digital-array detectors
Characterizing the astrometric precision limit for moving targets observed with digital-array detectors Open
Aims. We investigate the maximum astrometric precision that can be reached on moving targets observed with digital-sensor arrays, and provide an estimate for its ultimate lower limit based on the Cramér-Rao bound. Methods. We extend previo…
View article: The LQAC-4, last update of the Large Quasar Astrometric Catalogue
The LQAC-4, last update of the Large Quasar Astrometric Catalogue Open
Thanks to their point-like structure and to their lack of significant proper motion, quasars represent the ideal objects for modeling quasi-inertial directions in space. For that reason the present primary conventional reference frame, the…
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.