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Ejection of large particles from cometary nuclei in the shape of prolate ellipsoids

Wesołowski, M.; Gronkowski, P.

The ejection of cometary grains from comets is examined. It is assumed that cometary grains are chunks of ice-dust material. We focus on cometary nuclei in the shape of prolate ellipsoids. Two mechanisms are considered. The first one is the drag acting on the motionless grains lying on the surface of a comet's nucleus. It is a consequence of the c…

On a correlation among azimuthal velocities and the flyby anomaly sign

Acedo, L.; Bel, Ll.

Data of six flybys, those of Galileo I, Galileo II, NEAR, Cassini, Rosetta, and Messenger were reported by Anderson et al. (2008). Four of them: Galileo I, NEAR, Rosetta, and Messenger gain Newtonian energy during the flyby transfer, while Galileo II and Cassini lose energy. In both cases this is a surprising anomaly since Newtonian forces origina…