Other
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.321..361f&link_type=abstract
Nature (ISSN 0028-0836), vol. 321, May 15, 1986, p. 361-368. ESA-supported research.
Other
72
Abundance, Comet Nuclei, Cometary Atmospheres, Halley'S Comet, Iue, Ultraviolet Spectra, Carbon, Carbon Monoxide, Cosmic Dust, Cosmic Gases, Giotto Mission, Hydroxyl Radicals, Vega Project, Water, Comets, Halley, Satellite Observations, Gases, Dust, Production Rate, International Ultraviolet Explorer, Iue, Time Scale, Spectra, Emissions, Ultraviolet, Wavelengths, Comparisons, Water, Carbon, Procedure, Hydroxel Radical, Cesium, Brightness
Scientific paper
The observations of comet Halley from International Ultraviolet Explorer (IUE) satellite from March 9 to 16, 1986 allow a comprehensive study of gas and dust production by comet in the week during which the fleet of six spacecraft from four space agencies encountered the comet. The gaseous output of the nucleus was found to vary over timescales of the order of one or two hours. The Vega 2 probe crossed Halley's coma at the time of, or shortly after, the onset of a strong outburst. The Giotto spacecraft performed its measurements while the cometary nucleus was near a minimum of activity. The ultraviolet spectrum of comet Halley differs from that of other comets observed by the IUE satellite in that the continuum emission is very strong relative to the gaseous emissions, and the CO2(+) violet bands, if present, are weak. The rate of water production was estimated to be 5.6 x 10 to the 29th and 5.2 x 10 to the 29th molecules per second at the time of the Vega 2 and Giotto encounters, respectively, while atomic carbon was a few percent and CO about 10-20 percent of these values.
A'Hearn Michael F.
Arpigny Claude
Cosmovici Cristiano B.
Danks Anthony C.
Feldman Paul D.
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