QUASIHALO ORBITS ASSOCIATED WITH LIBRATION POINTS G. G\'OMEZ, Departament de Matem\`{a}tica Aplicada i An\`{a}lisi, Universitat de Barcelona, Gran Via 585, 08007 Barcelona, Spain J. MASDEMONT, Departament de Matem\`{a}tica Aplicada I, Universitat Polit\`{e}cnica de Catalunya, E.T.S.E.I.B., Diagonal 647, 08028 Barcelona, Spain C. SIM\'O, Departament de Matem\`{a}tica Aplicada i An\`{a}lisi, Universitat de Barcelona, Gran Via 585, 08007 Barcelona, Spain Abstract Quasihalo orbits are Lissajous trajectories librating about the well known halo orbits. The main feature of these orbits is that they keep an exclusion zone in the same way that halo orbits do. As a result, the knowledge of this type of orbit, gives more flexibility to the mission analysis design about collinear libration points of any pair of primaries in the solar system.