Geodesic
A note on the Determination of the Distance Between Two Asteroids During Their Regular Proximity
Zbornik radova, Tome 4 (1984) no. 12, p. 201 .

Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

An approximate method is developed by the aid of which one can determine the perturbative action of one asteroid upon his distance to the other one, durigh the regular proximity of these celestial bodies. The final effect appears to be not sensible during a time interval of "dynamical proximity" inferior to one day, if the mass of the perturbin asteroid is of the order of $10^{-13}$ Sun's mass and the proximity distance is of the order of 0.000005 a.u. 
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     author = {J. L. Simovljevi\'c},
     title = {A note on the {Determination} of the {Distance} {Between} {Two} {Asteroids} {During} {Their} {Regular} {Proximity}},
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J. L. Simovljević. A note on the Determination of the Distance Between Two Asteroids During Their Regular Proximity. Zbornik radova, Tome 4 (1984) no. 12, p. 201 . http://geodesic.mathdoc.fr/item/ZR_1984_4_12_a25/