Physics
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp1066...71h&link_type=abstract
ESA Spec. Publ., ESA SP-1066, p. 71 - 84
Physics
Comet 1910 Ii Halley, Comets:Space Instrumentation, Comets:Space Missions, Space Instrumentation:Comets, Space Missions:Comets
Scientific paper
The Japanese mission to comet Halley, called the "Planet-A" mission, involved the launch of the "Suisei", or Planet-A, spacecraft on 19 August 1985, to encounter comet Halley in March 1986. Additionally, a test spacecraft called "Sakigake" (i.e. Pioneer), or MS-T5, was launched on 8 January 1985. Hence, the Planet-A project actually involves two spacecraft, Planet-A and MS-T5. Planet-A has two major scientific objectives: (1) to study the growth and the decay of the comet's hydrogen corona and to determine the total hydrogen production rate by taking UV images of the corona over an extended period, (2) to study the interaction of the solar wind with the cometary ionosphere by measuring the three-dimensional distributions of ions and electrons (energy range 30 eV - 16 keV). MS-T5 has as its scientific objective: to study the solar-wind plasma and, if possible, determine the signatures of the solar-wind/comet interaction at large distances from the comet. The scientific experiments carried by Planet-A and MS-T5 are described.
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