Observational properties of low-energy orbits around icy moons

The moons of the giant planets are getting into the focus of the next explorationmissions to the outer solar system. The reason for this interest resides in theirdynamical role within their respective systems and the signs of habitability suggestedin some cases by surface and subsurface features. Flyby missions offer adequaterecognition scenarios for the initial exploration phase of a celestial body,but they must be followed by orbiters if more extended observations are required.The dynamical structures of the Circular Restricted Three-Body Problem pavethe way to such opportunities. In particular, libration point orbits around thetwo collinear equilibrium points L1 and L2 of a planet-moon-spacecraft systemare characterized by low speeds relative to the moon. Heteroclinic and homoclinicconnections built from these orbits allow close-up views of the moons.The aim of this work is to determine the observational performance of heteroclinicand homoclinic connections of planar Lyapunov orbits around L1 and L2for three systems of scientific relevance: Jupiter-Europa, Uranus-Titania andUranus-Oberon. Lunar surface coverage, repeat patterns, lunar distance rangesand speed profiles are derived and discussed for each case.