Tour Design Techniques for the Europa Clipper Mission

Campagnola, Stefano; Buffington, Brent; Lam, Try; Petropoulos, Anastassios E.; Pellegrini, Etienne

doi:10.2514/1.g004309

Cited by 33 publications

(13 citation statements)

References 12 publications

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“…The ability to suppose an asymmetric model for the conductivity structure of a moon is critical to an interpretation of measurements from upcoming missions, especially Europa Clipper , which plans flybys of Europa just 25 km above the surface—0.02 R E in altitude ( Campagnola et al, 2019 ). Close to the moon, induced magnetic moments of quadrupole and higher order will have their largest effect relative to the dominant dipole moments.…”

Section: Introductionmentioning

confidence: 99%

A perturbation method for evaluating the magnetic field induced from an arbitrary, asymmetric ocean world analytically

Styczinski

Vance

Harnett

et al. 2022

Icarus

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Section: Introductionmentioning

confidence: 99%

A perturbation method for evaluating the magnetic field induced from an arbitrary, asymmetric ocean world analytically

Styczinski

Vance

Harnett

et al. 2022

Icarus

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“…, those from the Galileo mission), future missions are more likely to be able to resolve higher-order magnetic moments. For example, the Europa Clipper mission plans numerous flybys that will approach within 25 km of Europa’s surface ( Campagnola et al, 2019 ; Lam et al, 2018 ), less than 2% of its radius in altitude.…”

Section: Introductionmentioning

confidence: 99%

Induced magnetic moments from a nearly spherical ocean

Styczinski

Harnett

2021

Icarus

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The five largest planets all have strong intrinsic magnetic fields that interact with their satellites, many of which contain electrically conducting materials on global scales. Conducting bodies exposed to time-varying magnetic fields induce secondary magnetic fields from movement of eddy currents. In the case of spherically symmetric conducting bodies, matching magnetic solutions at the boundary results in relatively simple relations between the excitation field and the induced field. In this work, we determine the more complicated induced magnetic field from a near-spherical conductor, where the outer boundary is expanded in spherical harmonics. Under the approximations that the excitation field is uniform at a single frequency, the product of wavenumber and radius for the body is large, and the average radius of the body is large compared to the perturbation from spherical symmetry, we find that each spherical harmonic in the shape expansion induces discrete magnetic moments that are independent from the other harmonics in the expansion. That is, simple superposition applies to the magnetic moments induced by each perturbation harmonic. We present a table of the magnetic moments induced by each spherical harmonic up to degree 2 in the perturbed shape. We also present a simple formula by which the induced magnetic field may be evaluated for any arbitrary shape described by expanding the radius of the conducting body in spherical harmonics. Unlike the Earth, many moons in the Solar System are tidally locked to their parent bodies, and many also contain saline, subsurface oceans. Conductive material in these moons is therefore expected to be non-spherical. Accounting for the boundary shape of Europa’s ocean will be critical for interpretation of Europa Clipper magnetic measurements near the moon, where the effects of quadrupole-and-higher magnetic moments will be most apparent. The results of this work permit magnetic studies considering non-spherical oceans of satellites for the first time.

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“…One of the mission design solutions to visit many asteroids is using asteroid flyby cycler trajectories [1], a special case of free-return cyclers. Free-return cyclers are periodic trajectories that shuttle a spacecraft between two or more celestial bodies and are typically used in the Sun-Earth-Mars system [2,3] and planetary moon systems [4,5]. Unlike typical free-return cyclers, asteroid flyby cyclers do not require the periodicity of all associated bodies' relative geometry because the spacecraft targets different bodies after each Earth gravity assist.…”

Section: Introductionmentioning

confidence: 99%

Asteroid Flyby Cycler Trajectory Design Using Deep Neural Networks

Ozaki,

Yanagida,

Chikazawa

et al. 2021

Preprint

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Tour Design Techniques for the Europa Clipper Mission

Cited by 33 publications

References 12 publications

A perturbation method for evaluating the magnetic field induced from an arbitrary, asymmetric ocean world analytically

A perturbation method for evaluating the magnetic field induced from an arbitrary, asymmetric ocean world analytically

Induced magnetic moments from a nearly spherical ocean

Asteroid Flyby Cycler Trajectory Design Using Deep Neural Networks

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