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    A gravity field to support Magellan navigation and science at Venus (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The development and validation of the revised JPL Venus Gravity Model are described with attention given to the incorporation of data regarding the longitudinal coverage. The motivation for the JPL Venus Gravity Model 1B (VGM1B) is related to the determination of orbit-support requirements for the Magellan mission. Existing gravity models for Venus are reviewed, and the present model is based on orbit-prediction data taken from Doppler tracking data from the Pioneer Venus Orbiter (PVO). Revised information arrays are developed incorporating more complete data describing the longitudinal conditions of the gravity field. Improvements are noted in the Doppler residual statistics taken from field-validation fits to the PVO and Magellan tracking data by using the VGM1B harmonic field. The VGM1B gravity field is also shown to reduce the trajectory errors from PVO and Magellan navigation.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: Journal of the Astronautical Sciences (ISSN 0021-9142); 40; 107-134
    Format: text
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  • 2
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    Relativity experiment on Helios - A status report (1975)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The relativity experiment on Helios (Experiment 11) uses S-band and Doppler data, and spacecraft-solar-orbital data to measure the effects of general relativity in the solar system and the quadrupole moment in the solar gravitational field. Specifically, Experiment 11 is converned with measuring the following effects: (1) relativistic orbital corrections described by two parameters of the space-time metric which are both equal to unity in Einstein's theory; (2) orbital perturbations caused by a finite quadrupole moment of an oblate sun, described by zonal harmonics in the solar gravitational field.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: AAS PAPER 75-102 , Astrodynamics Specialist Conference; Jul 28, 1975 - Jul 30, 1975; Nassau; Bahamas
    Format: text
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