HST observations of the inner coma of Comet Levy 1990c

Details HST observations of the inner coma of Comet Levy 1990c HST observations of the inner coma of Comet Levy 1990c

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992angeo..10..145f&link_type=abstract

(Modelling, simulation and sounding of cometary nuclei; Proceedings of the International Workshop, Cagliari, Italy, May 28-30, 1

Computer Science

Sound

2

Astronomical Models, Comet Nuclei, Cometary Atmospheres, Hubble Space Telescope, Okazaki-Levy-Rudenko Comet, Data Reduction, Eddington Approximation, Space Missions

Scientific paper

Data reduction procedures which will make it possible to model the nucleus of future targets of cometary space missions were tested on the basis of observations of Comet Levy 1990c by the HST on September 27, 1990. Faint hemispherical shells expanding in the coma, which is structured as a sunward fan deflected by solar radiation pressure, were observed. The Eddington fountain model makes it possible to infer the ejection times of the expanding shells and the initial velocity of the dust. Three shells ejected at time intervals of 11.5 and 12.5 h with an initial velocity of 0.35 km/s were observed for dust grains of 3-micron size. The lag angle of the fan is between 10 and 15 deg, thus suggesting a time delay of the most active sublimation of 1 h after midday. The observed time periodicities suggest a nucleus rotating in 24 h with a surface characterized by two active areas placed almost exactly in opposite hemispheres, even if a longer rotation period and a more complex nucleus topography can be excluded.

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