TY - JOUR A1 - Zhao, Lei T1 - Shooting for collinear periodic orbits in the Helium model T2 - Zeitschrift für angewandte Mathematik und Physik N2 - The frozen-planet periodic orbit of the classical collinear Helium model with negative energy is shown to exist by a simple shooting argument. This simplifies the approach established in Cieliebak et al. (Ann Inst H Poincaré Anal Non Linéaire 40:379–455, 2022). With this argument, it also follows that the algebraic count of the number of such orbits with a given negative energy is 1, as recently established in Cieliebak et al. (Nondegeneracy and integral count of frozen-planet orbits in helium, 2022. arXiv:2209.12634). The same argument also leads to the existence of other collinear periodic orbits of the classical collinear Helium model. KW - Applied Mathematics KW - General Physics and Astronomy KW - General Mathematics Y1 - 2023 UR - https://opus.bibliothek.uni-augsburg.de/opus4/frontdoor/index/index/docId/109661 UR - https://nbn-resolving.org/urn:nbn:de:bvb:384-opus4-1096611 SN - 0044-2275 SN - 1420-9039 VL - 74 IS - 6 SP - 227 PB - Springer Science and Business Media LLC ER -