## The Control and Use of Libration-point Satellites |

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analysis applications approximation assumed average becomes cable calculations Chapter characteristic equation collinear libration point collinear point communications concept considered constant control acceleration control system coordinate corrections cost determined direct distance Earth Earth-Moon L2 point Earth-Moon system eccentricity effect energy equations of motion equilibrium examined expressions finite bodies frequency function Gain geometry given gives higher initial keeping length libration point libration-point satellite limit cycle located lunar magnitude Mean measurements Mercury method missions Moon needed neglected nominal path obtained occulted orbit oscillation parameters periodic periodic orbit perturbations plane plot position possible presented problem radial-axis control ratio Reference region relative requirements restricted roots seen shown in Figure shows solar solar sail solution Space stability station Sun-Earth surface Table taking technique thrust tion trajectory transfer units unstable usually values variations vicinity written