Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008mgm..conf.2585v&link_type=abstract
"THE ELEVENTH MARCEL GROSSMANN MEETING On Recent Developments in Theoretical and Experimental General Relativity, Gravitation an
Astronomy and Astrophysics
Astronomy
Ppn Parameters, Space Experiments, Astrometry
Scientific paper
We explore the possibility of measuring the γ parameter of the Parameterized Post-Newtonian (PPN) formalism with an Earth-orbiting satellite and looking as close as possible to the solar limb. The technique is inspired to that used during the solar eclipse of 1919, when the gravitational bending of the light was measured for the first time. Simple estimations suggest that even a low-cost satellite could reach the 10-6 level of accuracy with ~ 106 observations of relatively bright stars at about 2° from the Sun. Further simulations with different magnitude limited star samples, uniformly distributed on the ecliptic plane, show that this result could be reached with only 20+20 days of measurements. A quick look at the real star densities suggest that this result could be greatly improved by observing particularly crowded regions near the galactic center.
Gai Marco
Lattanzi Mario G.
Morbidelli Roberto
Vecchiato Alberto
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