Physics
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esabu..38...36f&link_type=abstract
ESA Bulletin (ISSN 0376-4265), no. 38, May 1984, p. 36-41.
Physics
1
Comet Nuclei, European Space Programs, Giotto Mission, Halley'S Comet, Space Navigation, Coma, Dust, Ephemerides, Impact Resistance, Spacecraft Trajectories
Scientific paper
The ESA Giotto spacecraft will be one of five spacecrafts to encounter comet Halley in March 1986. Although two probes from the USSR will reach the comet first, Giotto is scheduled to make the closest fly-by of the nucleus within the cometary coma. Targeting and navigation of the spacecraft is difficult because of Halley's retrograde orbit and Giotto's heliocentric orbit, so in order to ensure ground station communication, the spacecraft must encounter the comet on the sunward side of the nucleus. Consequently, a nucleus model and a dust model have to be constructed to avoid a failure of the mission. Traveling at a velocity of 68 km/s, the spacecraft will enter the cometary dust cloud at a distance of 50,000 to 100,000 km from it's closest approach point and it is hoped that the two shields provided will protect it from harmful impact. Important preliminary data are expected from international cooperation concerning target position and environment.
Fertig J.
Hechler Friedhelm
Schwehm Gerhard
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