Kenta Oshima

Kenta Oshima
Hiroshima Institute of Technology · Department of Mechanical Systems Emgineering

Ph. D.

About

35
Publications
7,011
Reads
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188
Citations
Additional affiliations
April 2018 - present
National Astronomical Observatory of Japan
Position
  • PostDoc Position
April 2017 - March 2018
Waseda University
Position
  • Research Assistant
October 2016 - April 2017
Institute of Space and Astronautical Science, JAXA
Position
  • Visiting Scholar
Description
  • I performed a joint research with Dr. Stefano Campagnola, Dr. Chit Hong Yam, Prof. Kawakatsu about designing solar-perturbed lunar flybys, especially low-energy transfer trajectories of EQUULEUS mission to Earth-Moon L2 quasi-periodic orbits.
Education
April 2015 - March 2018
Waseda University
Field of study
  • Applied Mechanics and Aerospace Engineering

Publications

Publications (35)
Article
The present study investigates capture and escape dynamics associated with a planar, high–energy, retrograde periodic orbit around the Earth for applications to spacecraft trajectories. A lunar gravity assist plays the central role in both capture and escape scenarios. In the capture analysis, the trade–off among time–of–flights, launch energies, a...
Article
While prograde orbits around the Earth including libration point orbits and resonant orbits have been extensively investigated in the Earth-Moon system, retrograde orbits may offer unique characteristics potentially useful for future missions. Periodic orbits and associated dynamical structures in the Earth-Moon circular restricted three-body probl...
Article
Full-text available
Stable or weakly unstable orbits in cislunar space are attractive as potential locations that natural objects including dust particles may be trapped. Identifying such orbits is not straightforward especially in high-dimensional, many-body dynamical systems. The present paper adopts a strategy of limiting the search space around symmetric periodic...
Article
Periodic orbits in gravitational many--body problems have been fundamental special solutions for analyzing phase--space flows not only in autonomous systems but also in time--dependent non--autonomous systems. The growing interest in cislunar space may require deeper understandings of periodic orbits in the Earth--Moon system beyond the simplified...
Article
Full-text available
This paper explores a stability region near the \(1:1\) retrograde resonance with the Moon in the planar bicircular restricted four-body problem. We find, in addition to lunar distant retrograde orbits and Trojan orbits around the triangular equilibria, another co-orbital stability region in the Earth–Moon system under solar gravitational perturbat...
Conference Paper
Full-text available
This paper presents a method of designing low-energy transfers changing the out-of-plane amplitude substantially around a libration point L1 via the vertical instability of planar Lyapunov orbits in the Earth-Moon circular restricted three-body problem. A sequence of optimizations onto short-term stable manifolds associated with the weak vertical i...
Conference Paper
Full-text available
This paper explores the use of the instability peculiar to the planar elliptic restricted three-body problem. A proposed technique, called an eccentric excursion, gradually changes the eccentricity of unstable manifolds emanating from periodic orbits via multiple high-altitude flybys. As an application to the high-eccentricity, high-mass ratio, bin...
Article
This paper presents the trajectory design for EQUilibriUm Lunar-Earth point 6U Spacecraft (EQUULEUS), which aims to demonstrate orbit control capability of CubeSats in the cislunar space. The mission plans to observe the far side of the Moon from an Earth-Moon L2 (EML2) libration point orbit. The EQUULEUS trajectory design needs to react to uncerta...
Article
Full-text available
The first part of the present paper reveals interplays among invariant manifolds emanating from planar Lyapunov orbits around the three collinear Lagrange points L1, L2, and L3 for high energies. Once the energetically forbidden region vanishes, the invariant manifolds together form closed separatrices bounding transit orbits in the phase space, de...
Conference Paper
Full-text available
The first part of the present paper reveals interplays among invariant manifolds emanating from planar Lyapunov orbits around the three collinear Lagrange points L1, L2, and L3 for high energies. Once the energetically forbidden region vanishes, the invariant manifolds together form closed separatrices bounding transit orbits in the phase space, de...
Article
Full-text available
This paper explores the rich dynamics of quasi-satellite orbits (QSOs) with out-of-plane motions in the Earth–Moon and Mars–Phobos systems. The first part of the paper computes families of spatial periodic QSOs in the circular restricted three-body problem via bifurcation analyses and presents their orbital characteristics. We pay special attention...
Article
Full-text available
OMOTENASHE and EQUULEUS are two 6-U CubeSats by JAXA and The University of Tokyo to be launched in 2019 onboard of NASA's Exploration Mission 1. This paper presents the nominal trajectories and an overview of the mission analysis work and approaches. EQUULEUS trajectory exploits the Earth -Sun -Moon dynamics to capture the spacecraft into a librati...
Article
This paper highlights natural transport pathways between in-plane and out-of-plane states associated with the vertical instability of planar Lyapunov orbits around the Lagrange points L1 and L2 in the Earth-Moon circular restricted three-body problem. Computations of invariant manifolds associated with the vertical instability of planar periodic or...
Article
This paper investigates the effects of inclination excitations on co-orbital orbits in the Sun-Jupiter circular restricted three-body problem. Computations of invariant manifolds associated with the vertical instability of planar co-orbital periodic orbits enable quantifications of inclination excitations. We find that planar quasi-satellite orbits...
Conference Paper
Full-text available
This paper highlights natural transport pathways between in-plane and out-of-plane states associated with the vertical instability of planar periodic orbits in the circular restricted three-body problem. Computations of invariant manifolds associated with the vertical instability of planar periodic orbits, "vertically" stable and unstable manifolds...
Article
Full-text available
This paper globally explores two-impulse, low-energy Earth–Moon transfers in the planar bicircular restricted four-body problem with transfer time of up to 200 days. A grid search combined with a direct transcription and multiple shooting technique reveals numerous families of optimal low-energy solutions, including some that have not been reported...
Article
This paper identifies L4 and L5 axial orbits as possible transport gateways among several types of co-orbital orbits in the Sun-Jupiter spatial circular restricted three-body problem. Computation of finite time Lyapunov exponents reveals dynamical boundaries among co-orbital orbits in the high-dimensional phase space. We find that the visualized se...
Conference Paper
Full-text available
This paper explores rich dynamics of quasi-satellite orbits (QSOs) with out-of-plane motions in the Earth-Moon and Mars-Phobos spatial circular restricted three-body problems. The first part of the paper shows the role of L4 and L5 axial orbits as dynamical gateways into spatial QSOs. As an application, we show that a spacecraft can achieve a balli...
Conference Paper
Full-text available
Libration point orbits, in particular those in the Earth-Moon system, have been attracting attention for science and future human space exploration. EQUULEUS is a CubeSat planned to be launched by the NASA's SLS EM-1 vehicle and aims to reach and stay around the Earth-Moon L2 point with a purpose of scientific observation. As EQUULEUS is a piggybac...
Article
Full-text available
This paper globally searches for low-thrust transfers to the Moon in the planar, circular, restricted, three-body problem. Propellant-mass optimal trajectories are computed with an indirect method, which implements the necessary conditions of optimality based on the Pontryagin principle. We present techniques to reduce the dimension of the set over...
Article
Full-text available
This study analyzes a recently discovered class of exterior transfers to the Moon. These transfers terminate in retrograde ballistic capture orbits, i.e., orbits with negative Keplerian energy and angular momentum with respect to the Moon. Yet, their Jacobi constant is relatively low, for which no forbidden regions exist, and the trajectories do no...
Article
We explore minimal dynamical mechanisms for the transport of Trojan asteroids between the vicinities of the stable Lagrange points \(L_{4}\) and \(L_{5}\) within the framework of the planar restricted three- and four-body problems. This transport, called “jumping” of Trojan asteroids, has been observed numerically in the sophisticated Solar System...
Conference Paper
Full-text available
We develop and optimize a sample return trajectory passing by the vicinities of the Lagrange points L1 , L5 , L3 , and L4 in the Earth-Moon restricted three-and four-body problems. For the purposes of exploring L4 and L5 and reducing the transfer cost between them, we utilize a natural transfer trajectory of a Trojan asteroid between L4 and L5 thro...
Conference Paper
We explore two ways of gravity assists concerning three-body energy and twobody energy in the planar restricted four-body problem. The first is concerned with changing dynamical objects of the restricted three-body problem such as energy of orbits and energetically forbidden region via gravity assists within the framework of the restricted four-bod...

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Projects

Projects (6)
Project
To explore the use of retrograde orbits around the Earth for spacecraft. To explore celestial mechanics of retrograde orbits around the Earth.
Project
To explore the instability of periodic orbits peculiar to the elliptic restricted three-body problem.
Project
Analyze dynamical mechanisms of transport phenomena of asteroids based on methods in the dynamical systems theory.