153 citations · 153 across the 1 of their papers we have counts for
4 papers
The precious set of radio-optical reference frame objects in the light of Gaia DR2 data
Valeri V. Makarov, Ciprian T. Berghea, Julien Frouard +2
We investigate a sample of 3412 {\it International Celestial Reference Frame} (ICRF3) extragalactic radio-loud sources with accurate positions determined by VLBI in the S/X band, m…
Towards the ICRF3: astrometric comparison of the USNO 2016A VLBI solution with ICRF2 and Gaia DR1
Julien Frouard, Megan C. Johnson, Alan Fey +2
The VLBI USNO 2016A (U16A) solution is part of a work-in-progress effort by USNO towards the preparation of the ICRF3. Most of the astrometric improvement with respect to the ICRF2…
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…
Numerical Simulation of Tidal Evolution of a Viscoelastic Body Modelled with a Mass-Spring Network
Julien Frouard, Alice C. Quillen, Michael Efroimsky +1
We use a damped mass-spring model within an N-body code to simulate the tidal evolution of the spin and orbit of a self-gravitating viscoelastic spherical body moving around a poin…