Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ruimt..35....1v&link_type=abstract
Ruimtevaart, vol. 35, Oct. 1986, p. 1-8. In Dutch.
Astronomy and Astrophysics
Astronomy
2
Comet Nuclei, Flyby Missions, Giotto Mission, Halley'S Comet, Albedo, Astronomical Photography, Grigg-Skjellerup Comet, Interplanetary Dust, Isophotes
Scientific paper
The passage of Giotto to within 600 km of the Halley nucleus on March 14, 1986 is described and illustrated with diagrams and sample images. The principal operational parameters of the spacecraft are given; plans to return it to within 20,000 km of the earth and send it to an encounter with Comet Grigg-Skjellerup in 1992 are outlined; and the results for Comet Halley are summarized. Findings reported include nucleus diameter 15 km, nucleus height 7-10 km, nucleus albedo 2-4 percent, total gas production rate at the time of encounter 6.9 x 10 to the 29th molecules/s (+ or - 50 percent), water content in the gas about 80 percent, gas radial velocity 900 m/s, and a relatively high concentration of C(+) near the nucleus. A total of 12,000 dust particles (with masses ranging from about 10 attogram to 140 microgram) were detected, beginning at a distance of about 290,000 km from the nucleus; preliminary analysis indicates the presence of H, C, N, O, Na, Mg, Si, K, Ca, and Fe.
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