Mathematics – Probability
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979esasp.153....7r&link_type=abstract
In ESA Comet Halley Micrometeoroid Hazard Workshop p 7-15 (SEE N80-22200 12-91)
Mathematics
Probability
2
Flyby Missions, Halley'S Comet, Meteoroid Protection, Space Probes, Spacecraft Shielding, Structural Design Criteria, Comet Nuclei, Interplanetary Flight, Meteoroid Hazards, Space Rendezvous
Scientific paper
Four different models for the size distribution of cometary dust particles are compared. To protect the probe, a dual-sheet bumper shield is proposed that consists of a 1 mm aluminum front sheet and a 2 x 3 mm aluminum rear sheet with embedded honeycomb structure and a 25 cm space between the front and rear sheet. Three distinct hazards to the shield are identified: (1) individual large particles, whose debris cloud impacts on and tears the rear sheet; (2) numerous intermediate size particles which produce holes in the front sheet; and (3) a very large number of small particles, which produce craters in the front sheet leading to its erosion. The individual hazards are calculated. It is concluded that the probe will survive with a high probability a total fly-by of the comet nucleus with a distance of closest approach of about 100 km. The largest uncertainty in the results is due to the difficulty of experimentally investigating large particle impacts at 50 km/s.
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