Abstract
AbstractThe comet Hale-Bopp was continuously observed from September 1996 to April 1997. We used altogether 316 images of Hale-Bopp to analyse the evolution of dust shells system close to the nucleus. We performed measurements of relative distance of envelopes and velocity of its expansion. Evolution of the spiral arm revealed spin of the nucleus. We estimated the period of rotation to be 11.42 hours. With purpose to confront the real CCD images of dust éjecta and the measured ejection velocities a computer model of formation and expansion of the dust shells has been developed.
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