Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978clus.nasa...19r&link_type=abstract
In JPL A Close-up of the Sun p 19-41 (SEE N78-32964 23-92)
Astronomy and Astrophysics
Astronomy
Radio Astronomy, Signal Processing, Solar Gravitation, Solar Probes, Zonal Harmonics, Covariance, Doppler Effect, Radio Tracking, Relativistic Effects, Solar Instruments, Solar Neutrinos
Scientific paper
The use of radio tracking of a solar probe to estimate accurately the coefficient of the second zonal harmonic of the sun's gravitational field was examined. Preliminary results indicate that the coefficient can be estimated with a standard error of 10 to the minus 8th power or less, provided that the probe is equipped with a suitable drag-free system to compensate for the effects of non-gravitational accelerations. For signal paths that pass near the sun, dual-band ranging to the probe can provide the tracking accuracy needed to insure that the standard of error is equal to or less than 10 to minus 8th power. The possibility of achieving such accuracy with a single-band radio uplink and a dual-band downlink is discussed.
Reasenberg Robert D.
Shapiro Irwin I.
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