Estimation of the Gravitational Deflection of Radio Waves by the Sun Using Geodetic VLBI Data, 1979--1999

Details Estimation of the Gravitational Deflection of Radio Waves by the Sun Using Geodetic VLBI Data, 1979--1999 Estimation of the Gravitational Deflection of Radio Waves by the Sun Using Geodetic VLBI Data, 1979--1999

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..aprr12002s&link_type=abstract

American Physical Society, April Meeting, 2003, April 5-8, 2003 Philadelphia, Pennsylvania, MEETING ID: APR03, abstract #R12.002

Astronomy and Astrophysics

Astronomy

Scientific paper

Very-long-baseline interferometry (VLBI) allows one to measure with exquisite precision the deflection by the Sun of the path of radio waves emanating from distant compact radio sources. Specialized astronomical experiments conducted to measure this deflection have yielded results consistent with General Relativity (GR) at the level of about 0.2%. Analyses of large VLBI data sets optimized for studying Earth properties (geodetic data) yield even greater precision in such tests of GR because they contain many more time delay measurements associated with many more radio sources. Using two decades of geodetic VLBI data, we obtain a result consistent with GR and with a standard uncertainty nearly an order of magnitude smaller than that of the most precise published result. We will report on our result and our analysis of systematic errors that may limit its accuracy.

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