Geodesic
Motion of Two Very Near Minor Planets
Publications of the Department of Astronomy, Tome 11 (1981), p. 5
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Motion of the center of two masses and their motion about the center results from ingtegrals (6) and (8). At the proximity the masscenter moves along a orbit which slightly deviates from elliptical one, as much less as the planets are nearer one to other, regardless the mass-relation. The motion about the center takes place in a plane which is as much stable as the mass-relation is nearer to 1, but changes can be large when it is not so. in case $\varphi 10^{-6}r$ can occur conversion from the temporary to the long proximity, but probability is infinitesimal. More less are possibilites that then occurs a realy collision of planets (it their surfaces are very rough).
Keywords: motion, minor planets 
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     author = {B. Popovi\'c},
     title = {Motion of {Two} {Very} {Near} {Minor} {Planets}},
     journal = {Publications of the Department of Astronomy},
     pages = {5 },
     year = {1981},
     volume = {11},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PDA_1981_11_a0/}
}
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B. Popović. Motion of Two Very Near Minor Planets. Publications of the Department of Astronomy, Tome 11 (1981), p. 5 . http://geodesic.mathdoc.fr/item/PDA_1981_11_a0/