ExoClock Project. III. 450 New Exoplanet Ephemerides from Ground and Space Observations [PDF]
The Astrophysical Journal Supplement Series, 2023 The ExoClock project has been created to increase the efficiency of the Ariel mission. It will achieve this by continuously monitoring and updating the ephemerides of Ariel candidates, in order to produce a consistent catalog of reliable and precise ...
A. Kokori +216 more
doaj +2 more sources
Testing theories of gravity with planetary ephemerides [PDF]
Living Reviews in Relativity, 2023 We describe here how planetary ephemerides are built in the framework of General Relativity and how they can be used to test alternative theories. We focus on the definition of the reference frame (space and time) in which the planetary ephemeris is ...
Agnès Fienga, Olivier Minazzoli
doaj +2 more sources
IEEE Access, 2023 BDS-3 was formally put into service on July 31, 2020, and now along with BDS-2 provides the positioning, navigation and timing services. In this contribution, different techniques of dual-frequency absolute positioning using the fully serviceable BDS-2 ...
Shengnan Liu, Shaolin Zhu, Jian Zhang
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Calculation of the Uncertainties in the Planetary Precessions with the Recent EPM2017 Ephemerides and their Use in Fundamental Physics and Beyond [PDF]
Astronomical Journal, 2019 I tentatively compile the formal uncertainties in the secular rates of change of the orbital elements $a,~e,~I,~\Omega$ and $\varpi$ of the planets of the solar system from the recently released formal errors in $a$ and the nonsingular elements $h,~k,~p$
Iorio, Lorenzo
core +2 more sources
Determination of Orbital Elements and Ephemerides using the Geocentric Laplace’s Method
Journal of Astronomy and Space Sciences, 2020 This paper presents a methodology for Initial Orbit Determination (IOD) based on a modification of the Laplace’s geocentric method. The orbital elements for Near-Earth asteroids (1864) Daedalus, 2003 GW, 2019 JA8, a Hungaria-type asteroid (4690 ...
Daniela Espitia +2 more
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Accurate and Rapid Broadcast Ephemerides for Beidou-Maneuvered Satellites
Remote Sensing, 2019 The geostationary earth orbit (GEO) and inclined geosynchronous orbit (IGSO) satellites of the Beidou navigation satellite system are maneuvered frequently. The broadcast ephemeris can be interrupted for several hours after the maneuver.
Jing Qiao +3 more
doaj +2 more sources
Orbital Motions and the Conservation-Law/Preferred-Frame α3 Parameter [PDF]
Galaxies, 2014 We analytically calculate some orbital effects induced by the Lorentz-invariance momentum-conservation parameterized post-Newtonian (PPN) parameter \(\alpha_3\) in a gravitationally bound binary system made of a primary orbited by a test particle.
Lorenzo Iorio
doaj +4 more sources
ASSESSING EFFICIENCY OF GPS EPHEMERIDES IN DIFFERENT REGION USING PRECISE POINT POSITIONING [PDF]
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2023 Precise Point Positioning (PPP) is a technique that process Global Positioning System (GPS) observation that can achieve sub-decimetre accuracy. Precise ephemerides that contain satellite clock and position plays a vital role in minimising orbital and ...
H. S. Lee +3 more
doaj +1 more source
Combining astrometry and JUICE-Europa Clipper radio science to improve the ephemerides of the Galilean moons [PDF]
Astronomy & Astrophysics, 2023 The upcoming JUICE and Europa Clipper missions to Jupiter's Galilean satellites will provide radio science tracking measurements of both spacecraft. Such data are expected to significantly help estimating the moons' ephemerides and related dynamical ...
M. Fayolle +5 more
semanticscholar +1 more source
Bayesian test of Brans–Dicke theories with planetary ephemerides: Investigating the strong equivalence principle [PDF]
Astronomy & Astrophysics, 2023 Aims. We are testing the Brans–Dicke class of scalar tensor theories with planetary ephemerides. Methods. In this work, we apply our recently proposed Bayesian methodology to the Brans–Dicke case, with an emphasis on the issue of the strong equivalence ...
Vincenzo Mariani +4 more
semanticscholar +1 more source