Astronomy and Astrophysics – Astronomy
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.177..181s&link_type=abstract
In ESA The Sci. Aspects of the Hipparcos Space Astrometry Mission p 181-185 (SEE N82-30146 20-88)
Astronomy and Astrophysics
Astronomy
5
Astrometry, Data Reduction, Esa Satellites, Relativistic Effects, Black Holes (Astronomy), Gravitational Effects, Parameterization, Relativity, Schwarzschild Metric
Scientific paper
Relativistic effects on Hipparcos program data reduction and on the selection of stars for the observing list, are discussed. The general relativity model, the parameterized post-Newtonian framework, and direct measurement of the metric, are considered. Direct measurement is advocated, since the vast amount of light deflection data from Hipparcos provides an accurate basis for testing relativity. Also, direct measurement makes no assumptions about how the Sun generates the metric, unlike post-Newtonian formalisms. Selection of distant program stars as a way of detecting black holes is advocated. Deflection by a black hole would leave a characteristic signature in the residuals of the fit of a star to its best position. For example, a black hole passing below the line of sight would cause the star to execute a small loop.
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