165 citations · 611 across the 13 of their papers we have counts for
4 papers · 1 filter
Double stars and astrometric uncertainties in Gaia DR1
Valeri V. Makarov, Claus Fabricius, Julien Frouard
A significant number of double stars with separations up to 2.5 arcsec are present in the Gaia Data Release 1 astrometric catalogs. Limiting our analysis to a well-studied sample o…
UCAC5: New Proper Motions using Gaia DR1
Norbert Zacharias, Charlie Finch, Julien Frouard
New astrometric reductions of the US Naval Observatory CCD Astrograph Catalog (UCAC) all-sky observations were performed from first principles using the TGAS stars in the 8 to 11 m…
Tides in a body librating about a spin-orbit resonance. Generalisation of the Darwin-Kaula theory
Julien Frouard, Michael Efroimsky
The Darwin-Kaula theory of bodily tides is intended for celestial bodies rotating without libration. We demonstrate that this theory, in its customary form, is inapplicable to a li…
Astrometric evidence for a population of dislodged AGN
Valeri V. Makarov, Julien Frouard, Ciprian T. Berghea +5
We investigate a sample of 2293 ICRF2 extragalactic radio-loud sources with accurate positions determined by VLBI, mostly active galactic nuclei (AGN) and quasars, which are cross-…