Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986tdapr..84..152u&link_type=abstract
In its The Telecommunications and Data Acquisition Report p 152-163 (SEE N86-22784 13-32)
Astronomy and Astrophysics
Astronomy
Celestial Reference Systems, Interplanetary Navigation, Radio Sources (Astronomy), Very Long Base Interferometry, Deep Space Network, Galileo Spacecraft, Ground Stations, Radio Stars, Spacecraft Trajectories
Scientific paper
A comprehensive search was made in order to identify celestial radio sources that can be used as references for navigation of the Galileo spacecraft by means of VLBI observations. The astronomical literature was seached for potential navigation sources, and several VLBI experiments were performed to determine the suitability of those sources for navigation. The results of such work performed since mid-1983 is reported. A summary is presented of the source properties required, the procedures used to identify candidate sources, and the results of the observations of these sources. The lists of souces presented are not meant to be taken directly and used for VLBI navigation, but they do provide a means of identifying the radio sources that could be used at various positions along the Galileo trajectory. Since the reference sources nearest the critical points of Jupiter encounter and probe release are rather weak, it would be extremely beneficial to use a pair of 70-m antennas for the VLBI measurements.
Linfield Roger P.
Ulvestad James S.
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