# American Institute of Mathematical Sciences

March  2013, 33(3): 1215-1230. doi: 10.3934/dcds.2013.33.1215

## Computing collinear 4-Body Problem central configurations with given masses

 1 Professor "Eugenio Méndez Docurro 2011", de la Escuela Superior de Física y Matemáticas del IPN, Zacatenco, 07738 México, D F, Mexico

Received  April 2011 Revised  December 2011 Published  October 2012

An interesting description of a collinear configuration of four particles is found in terms of two spherical coordinates. An algorithm to compute the four coordinates of particles of a collinear Four-Body central configuration is presented by using an orthocentric tetrahedron, which edge lengths are function of given masses. Each mass is placed at the corresponding vertex of the tetrahedron. The center of mass (and orthocenter) of the tetrahedron is at the origin of coordinates. The initial position of the tetrahedron is placed with two pairs of vertices each in a coordinate plan, the lines joining any pair of them parallel to a coordinate axis, the center of masses of each and the center of mass of the four on one coordinate axis. From this original position the tetrahedron is rotated by two angles around the center of mass until the direction of configuration coincides with one axis of coordinates. The four coordinates of the vertices of the tetrahedron along this direction determine the central configuration by finding the two angles corresponding to it. The twelve possible configurations predicted by Moulton's theorem are computed for a particular mass choice.
Citation: Eduardo Piña. Computing collinear 4-Body Problem central configurations with given masses. Discrete & Continuous Dynamical Systems - A, 2013, 33 (3) : 1215-1230. doi: 10.3934/dcds.2013.33.1215
##### References:
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##### References:
 [1] D. G. Saari, "Collisions, Rings, and Other Newtonian N-Body Problems,", American Mathematical Society, (2005). Google Scholar [2] F. R. Moulton, The straight line solutions of the problem of N-bodies,, Annals of Mathematics, 12 (1910), 1. doi: 10.2307/2007159. Google Scholar [3] R. Lehmann-Filhés, Ueber swei Fälle des Vielkörpersproblems,, Astr. Nachr, 127 (1891), 137. Google Scholar [4] E. Piña, Algorithm for planar Four-Body Problem central configurations with given masses,, preprint, (). Google Scholar [5] E. Piña, New coordinates for the four-body problem,, Rev. Mex. Fis., 56 (2010), 195. Google Scholar [6] E. Piña and P. Lonngi, Central configurations for the planar Newtonian four-body problem,, Cel. Mech. & Dyn. Astr., 108 (2010), 73. doi: 10.1007/s10569-010-9291-5. Google Scholar [7] L. Landau and E. Lifshitz, "Mechanics,", Pergamon Press, (1960). Google Scholar [8] J. L. Lagrange, Solutions analytiques de quelques problèmes sur les piramides triangulaires,, Nouv. Mem. Acad. Sci. Berlin, (1773), 149. Google Scholar [9] N. A. Court, Notes on the orthocentric tetrahedra,, The American Mathematical Monthly, 41 (1934), 499. doi: 10.2307/2300415. Google Scholar [10] E. Piña and A. Bengochea, Hyperbolic geometry for the binary collision angles of the three-body problem in the plane,, Qualitative Theor. of Dyn. Sys., 8 (2009), 399. doi: 10.1007/s12346-010-0009-6. Google Scholar [11] C. Simó, El conjunto de bifurcación en el problema espacial de tres cuerpos,, in, (1975), 211. Google Scholar [12] J. V. Jose and E. J. Saletan, "Classical Mechanics, A Contemporary Approach,", Cambridge University Press, (1998). doi: 10.1017/CBO9780511803772. Google Scholar [13] A. Bengochea and E. Piña, The dynamics of saturn, janus and epimetheus as a three-body problem in the plane,, Rev. Mex. Fis., 55 (2009), 97. Google Scholar [14] E. T. Whittaker, "A Treatise on the Analytical Dynamics of Particles and Rigid Bodies,", $4^{th}$ edition, (1937). Google Scholar [15] E. Piña, Rotations with Rodrigues' vector,, Eur. J. Phys., 32 (2011), 1171. doi: 10.1088/0143-0807/32/5/005. Google Scholar [16] K. R. Meyer, G. R. Hall and D. Offin, "Introduction to Hamiltonian Dynamical Systems and the N-Body Problem,", $2^{nd}$ edition, (2009). Google Scholar
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