Improved test of general relativity with radio doppler data from the Cassini spacecraft
Radio Doppler data from the Cassini spacecraft during its solar conjunction in June 2002 can be used to test General Relativity.
radio science↗
Engineering topics
Giampieri, G.
Publications and source records attributed to Giampieri, G..
Gravity field and interior structure of Rhea
Doppler data generated with the Cassini spaceraft's radio carrier waves at X and Ka band can be used to determine the quadrupole moments of Rhea's gravitational field.
Cassini gravitational field Rhea gravity↗
Perturbations of a Spacecraft Orbit During an Hyperbolic Flyby
A first-order perturbation theory exists for the flyby problem with the Born approximation as the reference orbit.
perturbations Hyperbolic flyby Celestrial Mechanic↗
On the Antenna Pattern of Orbitting Interferometer
We consider the response of an interferometer moving with respect to a fixed reference frame, and derive a simple expression for the beam-pattern factors and the polarization-averaged antenna power pattern...Then, we consider a class of motions where the detector's plane is constrained to move on the surface of a cone of constant aperture; at the same time, the two arms are rotating around a vertical axis...In addition, we consider the case of an Earth-based interferometer...Finally, we discuss LISA's response to circularly polarized sinusoidal waves, coming from a few known binary systems in our Galaxy.
interferometer interferometry antenna motions LISA↗
Gravitational coefficients and internal structures of the icy Galilean satellites: An assessment of the Galileo Orbiter mission
Simulated radio tracking data from one flyby of Europa, two flybys of Ganymede, and two flybys of Callisto by the Galileo Orbiter yield estimates of the standard errors in the gravitational coefficient J(sub 2) of 44, 8.5, and 12 (in units of 10(exp -6)) for Europa, Ganymede, and Callisto, respectively; errors in C(sub 22) (in units of 10(exp -6)) are 12, 1.7, and 2.1. These errors are sufficiently small that the values of J(sub 2) and C(sub 22) to be measured by Galileo should suffice to determine if the ice and rock in the satellite interiors are uniformly mixed or separated, so long as the bodies are in hydrostatic equilibrium.
Schubert, G.↗
Search for Gravitational Wave Trains with the Spacecraft ULYSSES
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ULYSSESS gravitatinal wave mHz band Pearson method↗
Search for Gravitational Wave Trains with the Spacecraft Ulysses
We report on the search for periodic gravitational wave in the mHz band conducted with the spacecraft ULYSSES. Gravitational wave signals generally provide information about the distance of the source; ULYSSES' data have a.
gravitation galaxies: nuclei↗
Hetrodyne Laser Tracking at High Doppler Rates
In hetrodyne laser tracking of a spacecraft, the incoming laser signal may be significantly offset from the local laser reference, producing a high-frequency beat note that must be accurately counted to produce an accurate phase measurement.
hetrodyne laser tracking↗
Limits on the Gravitational Wave Background from Spacecraft Doppler Experiments
Doppler tracking of an interplanetary spacecraft provides an unique opportunity to search for low frequency gravitational waves.
gravitational waves↗
Search for Gravitational Wave Trains with the Spacecraft ULYSSES
We report on the search for periodic gravitational wave in the mHz band conducted with the spacecraft ULYSSES.
gravitational wave trains↗
Sinusoidal Gravitational Waves from Mass-varying Binary Systems
It is believed that most quasars and galaxies present two common features: the presence in their core of a supermassive object, and the experience of one or more encounters with other galaxies.
AGN black hole galaxies binary pulsar stellar bina↗
Gravitatinal Coefficients and Internal Structures of the Icy Galilean Satellites: An Assessment of the Galileo Orbiter Mission
Simulated radio tracking data from one flyby of Europa, two flybys of Ganymede, and two flybys of Callisto by the Galileo Orbiter yield estimates of the standard errors in the gravitational coefficient J*** of 44, 8.5, and 12 (in units of 10***) for Europa, Ganymede, and Callisto, respectively; errors in C***(in units of 10***) are 12, 1.7 and 2.1.
Galilean↗
Gravitational Wave Background in Coincidence Experiments with Doppler Tracking of Interplanetary Spacecraft
It is possible that a gravitational wave background, analogous to the electromagnetic one, fills the whole Universe.
primordial Universe stochastic background astrophy↗
The gravitational wave experiment
Since the optimum size of a gravitational wave detector is the wave length, interplanetary dimensions are needed for the mHz band of interest. Doppler tracking of Ulysses will provide the most sensitive attempt to date at the detection of gravitational waves in the low frequency band. The driving noise source is the fluctuations in the refractive index of interplanetary plasma. This dictates the timing of the experiment to be near solar opposition and sets the target accuracy for the fractional frequency change at 3.0 x 10 exp -14 for integration times of the order of 1000 sec. The instrumentation utilized by the experiment is distributed between the radio systems on the spacecraft and the seven participating ground stations of the Deep Space Network and Medicina. Preliminary analysis is available of the measurements taken during the Ulysses first opposition test.
Bertotti, B.↗