Results 131 to 140 of about 26,872 (287)
Global Dynamics and Ephemerides
, 2012 When speaking of Gaia it is instructive to remember the first ESA mission dedicated to high precision astronometry HIPARRCOS launched in August 1989. HIPPARCOS can be considered as Gaia's precursor, indeed the observing strategy aspects are similar and both missions were designed specifically for high precision astronmetry. After three and a half years
Hestroffer, Daniel, David, Pedro
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Ephemerides of the outer Jovian satellites [PDF]
Astronomy & Astrophysics, 2005 The results of the determination of orbits for 54 outer satellites of Jupiter based on all available observations of these satellites are presented. The problem was solved using numerical integration method applied to the equations of satellite motion. After initial conditions of integration were refined, the residuals of observations from theory were ...
openaire +4 more sources
, 2010 We, first, analytically work out the long-term, i.e. averaged over one orbital revolution, perturbations on the orbit of a test particle moving in a local Fermi frame induced therein by the cosmological tidal effects of the inhomogeneous Lemaitre-Tolman ...
A. Fienga +17 more
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Orbital Motions and the Conservation-Law/Preferred-Frame α3 Parameter
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 +1 more source
, 2013 In the 19th century, several astronomers made observations of sunspots, recording their positions and sometimes their areas. These observations were published in the form of extensive tables, but have been unhelpful until now.
Casas, R., Vaquero, J. M.
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Absolute Timing of the Crab Pulsar with RXTE
, 2004 We have monitored the phase of the main X-ray pulse of the Crab pulsar with the Rossi X-ray Timing Explorer (RXTE) for almost eight years, since the start of the mission in January 1996. The absolute time of RXTE's clock is sufficiently accurate to allow
Andrew G. Lyne +6 more
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