P/Halley, the Model Comet, in View of the Imaging Experiment Aboard the Vega Spacecraft

Abstract

Abstract.In this paper, those results of the VEGA imaging experiments are summarized that probably have general validity for any comet. Shape, size, surface structure, jet activity, and rotation pattern are considered in this respect. It is pointed out that imaging data provide indispensable information for an understanding of cometary activity.

Triaxiality of satellites and small bodies in the Solar System

“…The triaxial satellites treated are listed in Table I, the triaxial asteroids in Table II; R' stands for the mean radius, eb the mean equatorial radius. The lengths of semiaxes u' > b' > c' determined in situ, the centric gravitational constants and/or densities were taken from (Burns, 1986;Carr et al, 1994;Davies et al, 1987Davies et al, , 1996De Angelis, 1995;Dermott and Thomas, 1988, Dunham et al, 1990Gaskell et al, 1986;German and Friedlander, 1991;Hudson and Ostro, 1994;Kinoshita and Nakai, 1995;O'Leary and Van Flandem, 1972;Rubincam et al, 1995;Stooke, 1993aStooke, , 1994aStooke and Lumsdon, 1993;SzegB, 199 1;Szeto, 1983;Thomas, 1989Thomas, ,199 1,1993Thomas and Dermott, 1991;Thomas et al, 1994;Veverkaet al, 1994;Zharkov et al, 1985). Earth, Moon andPlanets 75: 95-126, 1996.…”