Physics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14..648d&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 14, June 1987, p. 648-651.
Physics
3
Halley'S Comet, International Sun Earth Explorer 3, Neutral Particles, Orbit Calculation, Ion Production Rates, Orbital Elements, Water, Comets, Halley, Ice Mission, Neutral Particles, Spacecraft Observations, Orbits, Calculations, Technique, Particles, Velocity, Orbital Elements, Diagrams, Gases, Comae, Trajectories, Ions, Models, Parameters
Scientific paper
To investigate the question of how neutral particles could travel from Comet Halley to the ICE spacecraft, Kepler orbits that connect the positions of Halley and ICE in space and time are calculated. From these orbits, the initial speed of the particle, relative to Halley, can be found as a function of departure time. It is found that there is a minimum relative speed of 7.5 km/s, for particles leaving the comet on Feb. 6, 1986, three days before perihelion. Particles emitted before this date actually require a higher relative speed. Lower speeds of about 5 km/s are again possible for departure dates in Nov. 1985, when the molecular production rate is considerably reduced.
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