Abstract
My father K. Stumpff (1947, 1949, 1951, 1959, 1962) developed a transcendental equation which replaces the original Kepler equation but is valid for all types of orbits. Other advantages over the classical methods are: a) the independent arguments of the equation follow from the vectors of position and velocity at any instant To, where To is not necessarily the perihelion time; b) an explicit knowledge of the classical orbital elements is not required; c) transformations of coordinate systems are avoided. The present paper discusses the properties of the general Kepler equation in a wide range of its independent arguments, and it is shown that analytic solutions, existing in special cases, can be used for the numerical solution of general cases. The theory is generalized insofar as it now can handle not only attracting forces but also repulsive ones. As a result of this investigation, FORTRAN subroutines were developed which can be used in connection with any two-body problem for the computation of position and velocity as function of time along any unperturbed orbit.
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References
Stumpff, K.: 1947, Astron. Nachr.275, 108
: 1949,Neue Theorie und Methode der Ephemeridenrechnung Abhandl. der Deutschen Akademie d. Wiss., Berlin, Jahrgang 1947
: 1951, Astron. Nachr.280, 97
: 1959,Himmelsmechanik I VEB Deutscher Verlag der Wiss., Berlin
Stumpff, K.: 1962, NASA Rep. D-1415
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Stumpff, P. The general Kepler equation and its solutions. Celestial Mechanics 43, 211–222 (1987). https://doi.org/10.1007/BF01234567
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DOI: https://doi.org/10.1007/BF01234567