Publications (9)
The five largest satellites of Uranus: astrometric observations spread over 29 years at the Pico dos Dias Observatory
Julio I. B. Camargo, Carlos H. Veiga, Roberto Vieira-Martins +2
We present the astrometry of the five largest satellites of Uranus from observations spread over almost three decades with photographic plates and CCDs (mainly), taken at the Pico…
The PLATO Mission
Heike Rauer, Conny Aerts, Juan Cabrera +842
PLATO (PLAnetary Transits and Oscillations of stars) is ESA's M3 mission designed to detect and characterise extrasolar planets and perform asteroseismic monitoring of a large numb…
Coupled geophysical and thermal constraints link between Mars basal molten layer and the planet viscosity profile
Alex Guinard, Agnes Fienga, Anthony Memin +1
Computing the tidal deformations of Mars, we explored various Mars internal structures by examining profiles that include or exclude a basal molten layer within the mantle and a so…
Report of the IAU Commission 4 Working Group on Standardizing Access to Ephemerides and File Format Specification
James L. Hilton, Charles Acton, Jean-Eudes Arlot +9
The IAU Commission 4 Working Group on Standardizing Access to Ephemerides recommends the use of the Spacecraft and Planet Kernel (SPK) format as a standard format for the position…
Viscosity contrasts in the Venus mantle from tidal deformations
Christelle Saliby, Agnes Fienga, Arthur Briaud +2
The tidal deformations of a planet are often considered as markers of its inner structure. In this work, we use the tide excitations induced by the Sun on Venus for deciphering the…
Lunar References Systems, Frames and Time-scales in the context of the ESA Programme Moonlight
Agnes Fienga, Nicolas Rambaux, Krzysztof Sosnica
Lunar reference systems represent a fundamental aspect of lunar exploration. This paper presents a review of the topic in the context of the ESA lunar programme, MoonLight. This pa…
Observational constraint on the radius and oblateness of the lunar core-mantle boundary
Vishnu Viswanathan, Nicolas Rambaux, Agnes Fienga +2
Lunar laser ranging (LLR) data and Apollo seismic data analyses, revealed independent evidence for the presence of a fluid lunar core. However, the size of the lunar fluid core rem…
Use of MESSENGER radioscience data to improve planetary ephemeris and to test general relativity
Ashok Verma, Agnes Fienga, Jacques Laskar +2
The current knowledge of Mercury orbit has mainly been gained by direct radar ranging obtained from the 60s to 1998 and by five Mercury flybys made by Mariner 10 in the 70s, and ME…
Historical Reflections on the Work of IAU Commission 4 (Ephemerides)
George H. Kaplan, John A. Bangert, Agnes Fienga +10
As part of a reorganization of the International Astronomical Union (IAU), Commission 4 (Ephemerides) went out of existence after the IAU General Assembly in August 2015. This pape…