Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102.1879t&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 102, Nov. 1991, p. 1879-1888. Research supported by NASA.
Astronomy and Astrophysics
Astronomy
32
Astrometry, Gravitational Lenses, Planetary Gravitation, Relativistic Effects, Deflection, Electromagnetic Radiation, Jupiter (Planet), Radio Interferometers
Scientific paper
The technique of differential VLBI, over two DSN California-Australia baselines, is used to measure the angular deflection of the ray path of P0201 + 113 when it passed within 200 arcsec of Jupiter on March 21, 1988. Its angular position was measured 10 times over 4 hr on that date, with a similar measurement set on April 2, 1988, to detect the differential angular deflection of the ray path. According to general relativity, the expected gravitational bend of the ray path averaged over the March experiment duration was approximately 300 microarcsec, projected onto the two California-Australia baselines over which it was measured. Measurement accuracies of the order of 160 microarcsec were obtained for each of the ten differential measurements. The chi(2) per degree of freedom of the data for the noise and tropospheric fluctuations fully accounted for the scatter in the measured angular deflections. The chi(2) per degree of freedom for the hypothesis of no gravitational deflection by Jupiter was 4.1, which rejects the no-deflection hypothesis with greater than 99.999-percent confidence.
Lowe Stephen T.
Treuhaft Robert N.
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