| Project/Area Number |
22K14424
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 24010:Aerospace engineering-related
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| Research Institution | Kyushu University |
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Principal Investigator |
陳 泓儒 九州大学, 工学研究院, 助教 (50904009)
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| Project Period (FY) |
2022-04-01 – 2025-03-31
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| Project Status |
Discontinued (Fiscal Year 2023)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2024: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2023: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2022: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | J2 perturbation / martian moons / binary asteroids / proximity orbiting / 3-body problem / quasi-periodic orbits / small-body exploration / Hamiltonian function / Canonical tranformation / Quasi-periodic orbits / J2-peturbed problem / Elliptic problem / small planetary moons / Small bodies / Nonheliocentric missions / Orbit design / Stability analysis / Orbit perturbations |
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| Outline of Research at the Start |
The confirmed MMX and HERA-Juventas missions are targeting Martian moons and the binary asteroid Didymoon, respectively, which are secondary bodies orbiting a primary body. Dynamics around these bodies is not like that around the heliocentric small targets ever visited. To enable exploration of non-heliocentric small bodies, it is necessary to gain deeper insights to the dynamical and operational drivers of the orbiting instability and devise strategies coping with the influential perturbation, which will be addressed in this project.
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| Outline of Annual Research Achievements |
The dynamic model, J2-ER3BP+GH, to desribe the orbital dynamics around a small moon is developed. It incorporates the perturbation from the oblatenss on the orbit of the small moon and spacecraft around the moon, and can accomendate a full non-spherical gravity model of the small moon. Even though the model is sophisticated, bounded orbits can still be identified in this model by identifying the center manifold of the associated auxiliary autonomous 8-dimensional system. Baseline orbits around Phobos and Dimorphos from J2-ER3BP+GH become much easier to maintain in the high-fidelity dynamic and control environments.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
This research project progresses as planned.
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| Strategy for Future Research Activity |
The orbiting stability has been improved via the passive approach, namely, the improvement of the validity of the dynamic model and baseline orbits. The next step is to further improve the orbting stability via the active approach. Orbit dynamical features (e.g., unstable directions) will be further analyzed in the J2-ER3BP and orbit control laws will be devised accordingly.
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