The book focuses on the orbital dynamics and mission trajectory （transfer or target trajectory） design of low-energy flight in the context of modern astrodynamics. It investigates various topics that either offer new methods for solving classical problems or address emerging problems that have yet to be studied， including low-thrust transfer trajectory design using the virtual gravity field method; transfer in the three body system using invariant manifolds; formation flying under space-borne artificial magnetic fields; and the orbital dynamics of highly irregular asteroids. It also features an extensive study of the orbital dynamics in the vicinity of contact binary asteroids， the third-order analytical solution of orbital motion in the vicinity of the non-collinear equilibrium point.
Contents Preface Chapter 1 Introduction 1 1.1 Low-Thrust Propulsion 3 1.2 Transfer in the Earth-Moon System 4 1.3 Orbital Dynamics Around Irregular Bodies 4 Chapter 2 Continuous Low Thrust Trajectory Design and Optimization 6 2.1 The Virtual Gravity Field Method 6 2.1.1 Introduction[1-25] 6 2.1.2 The Definition of Virtual Central Gravitational Field 7 2.2 Trajectory Design Using the VCGF Method 9 2.2.1 Rendezvous Trajectory Design Using VCGF Method 9 2.2.2 Orbit Interception Trajectory Design Using VCGF Method 14 2.2.3 Mission Applications 15 2.2.4 Conclusion Remarks 24 2.3 Orbital Rendezvous Between Close Near Earth Asteroids Considering the Third Body Perturbation 25 2.3.1 Introduction 25 2.3.2 The Variation of Orbital Elements Caused by the Earth Gravitational Perturbation 27 2.3.3 Orbital Rendezvous Considering the Third Body Perturbation 30 2.3.4 Minimal Fuel Consumption Optimization Using Hybrid Systems 34 2.3.5 Simulation Analysis 36 2.3.6 Conclusions 41 References 42 Chapter 3 Transfer Between Libration Point Orbits and Lunar Orbits in Earth-Moon System 44 3.1 Introduction[1-23] 44 3.2 The Dynamic Model 46 3.2.1 Equations of Motion 46 3.2.2 Change of Coordinates Between the Synodic CR3BP and the Moon-Centred Sidereal Frames 47 3.3 Computation of a Transfer from LPO to a Circular Lunar Orbit 50 3.3.1 Computation of the Transfer Manoeuvre to a Keplerian Ellipse with a Fixed Inclination i 52 3.3.2 Computation of the Departure Manoeuvre: First Approximation 53 3.3.3 Refinement of the Departure Manoeuvre and Determination of P2 55 3.3.4 Computation of the Insertion Manoeuvre at P2 57 3.4 Numerical Results 58 3.4.1 Departing Halo Orbits and Their Invariant Manifolds 58 3.4.2 Selection of the Inclination i1 60 3.4.3 Role of the Angles Between the Arrival and Departure Velocities at P1 and P2 62 3.4.4 The Role of the Orbit on the Unstable Manifold with 64 3.4.5 Varying P1 Along the Manifold Leg 66 3.4.6 Setting P1 at the First Apolune 69 3.4.7 Changing the Sizes of the Departing and the Target Orbits 69 3.5 Conclusions 72 References 73 Chapter 4 Lorentz Force Formation Flying in the Earth-Moon System 76 4.1 Introduction[1-38] 77 4.2 Analysis of the Relative Dynamics of a Charged Spacecraft Moving Under the Influence of a Magnetic Field 78 4.2.1 Modelling Equations and Symmetries 78 4.2.2 Equations of Motion in the Normal， Radial and Tangential Cases 81 4.2.3 Symmetries 82 4.2.4 Equilibrium Points 83 4.2.5 Stability of the Equilibrium Points 85 4.2.6 Zero Velocity Surfaces 89 4.3 Periodic and Quasi-periodic Orbits Emanating from Equilibria 93 4.3.1 Computation of Periodic Orbits Around the Equilibrium Points 93 4.3.2 Computation of 2D Invariant Tori 99 4.3.3 Numerical Results on Periodic and Quasi-periodic Orbits 107 4.3.4 The Normal Case 107 4.3.5 The Radial Case 120 4.3.6 The Tangential Case 125 4.4 Formation Flying Configuration Design 127 4.4.1 Formation Flying Configuration Using Equilibrium Points 127 4.4.2 Formation Flying Configuration Using Periodic Orbits 127 4.5 Conclusions 130 References 121 Chapter 5 1∶1 Ground-Track Resonance in a 4th Degree and Order Gravitational Field 134 5.1 Introduction[1-18] 135 5.2 Dynamical Model 136 5.2.1 Hamiltonian of the System 136 5.2.2 1∶1 Resonance 137 5.3 Primary Resonance 139 5.3.1 EPs and Resonance Width 139 5.3.2 Numerical Results 139 5.4 Secondary Resonance 144 5.4.1 The Location and Width of Hreson2 145 5.4.2 1996 HW1 146 5.4.3 Vesta 151 5.4.4 Betulia 155 5.5 The Maximal Lyapunov Characteristic Exponent of Chaotic Orbits 158 5.6 Conclusions 160 References 162 Chapter 6 Orbital Dynamics in the Vicinity of Contact Binary Asteroid Systems 164 6.1 Summary 164 6.2 Numerical Analysis of Orbital Motion Around Contact Binary Asteroid System 166 6.2.1 Introduction[1-55] 166 6.2.2 Dynamical Model 168 6.2.3 Contact Binary System 1996 HW1 171 6.2.4 Orbital Motion Around the System 181 6.2.5 Conclusions 187 6.3 Orbital Motion in the Vicinity of the Non-collinear Equilibrium Points 188 6.3.1 Introduction 188 6.3.2 Dynamical Model 190 6.3.3 Non-collinear EPs and Their Stability 192 6.3.4 Motion Around the Stable Non-collinear EPs 195 6.3.5 Motion Around the Unstable Non-collinear EPs 201 6.3.6 Conclusions 207 References 208 Appendix A The Primary Zonal and Tesseral Terms Contributing to the 1∶1 Resonance 212 Appendix B The Un-normalized Spherical Harmonic Coefficients to Degree and Order 4 214 References 215 Appendix C The Location of EPs and Resonance Width 216 Appendix D The Second Derivatives of the Potential at the Eps Located at (x0， y0， 0) 218 Appendix E The First and S
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