How large cometary dust grains are?

Details How large cometary dust grains are? How large cometary dust grains are?

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf..959m&link_type=abstract

European Planetary Science Congress 2008, Proceedings of the conference held 21-25 September, 2008 in Münster, Germany. Online a

Computer Science

Scientific paper

Every dust grain of a cometary nucleus surface suffers the action of several forces: drag force, nucleus and Sun gravitational forces, solar radiation pressure force and inertial forces. The latter forces, due to the nucleus-attached selected system, are the gravitational comet attraction by the Sun and that due to the rotation of the comet (spin). The rotational inertial force can be expressed by (...) where d is the dust grain diameter, rd is the grain density, Ω r is the nucleus angular velocity, and d rr and are the dust grain position vector and the speed, respectively. As noted by [1], dust grains will lift from the nucleus if (...) being n r an unit normal vector to the surface. In the limit, that scalar product will be equal to 0 for the largest grain that can be lifted from the nucleus, noted here by dmax (maximum diameter).Thus, we obtain: (...) (g is the gravitational acceleration of the comet and j is the latitude of the surface place where the dust particle is left). The rotation term can be important, as reported by [2] and so for comets rotating as fast as a six hours period, the obtained value of d increases by more than 40 per cent. max In this work we discuss the obtained values of for comets studied using different techniques. We will also show orbits of dust particles released from the nucleus surface and we will compare with those obtained by [3].

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