Voyager 2 test of the radar time-delay effect

Details Voyager 2 test of the radar time-delay effect Voyager 2 test of the radar time-delay effect

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...373..665k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 373, June 1, 1991, p. 665-670.

Astronomy and Astrophysics

Astrophysics

8

Gravitational Effects, Radio Equipment, Rangefinding, Relativistic Effects, Space Based Radar, Voyager 2 Spacecraft, Conjunction, Deep Space Network, Downlinking, Gravitation Theory, Solar Gravitation

Scientific paper

By analyzing radio range measurements generated during the solar conjunction of the Voyager 2 spacecraft in 1985, the relativistic time-delay effect has been tested accurately with a spacecraft at a distance of 3 x 10 to the 9th km from the earth. Because the range measurements were generated simultaneously at two frequencies on the downlink, it was possible to derive calibrations for the delay resulting from intervening solar plasma. In addition, a record of attitude thruster firings was used to model small accelerations of the spacecraft that could have produced a range error. It was thereby possible to determine the parameterized post-Newtonian parameter gamma to an accuracy of 3 percent with only a sparse amount of range data.

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