halo orbit en · NOUN
Etymology
First used by NASA mission specialist Robert W. Farquhar in 1966 for calculated orbits around the Earth–Moon L₂ point which required the use of thrusters to be made periodic.
Meanings
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(qualifier:orbital mechanics) A periodic, three-dimensional orbit about any one of the Lagrange points L₁, L₂ or L₃ of a two-body gravitational system.
Due to the strong hyperbolic character of the halo orbits, the stable manifold approaches the halo orbit in a very fast way. This fact means that if we are able to put the satellite in the stable manifold of a halo orbit, it will be close to the halo orbit (say at [a] few km) in a reasonable period of time.
2001, G. Gómez, À. Jorba, J. Masdemont, C.Simó, Dynamics and Mission Design Near Libration Points, Volume III, World Scientific, page 93:Thus, the minimum possible size for halo orbits in the Sun-Earth system is approximately (240 x 660) 10³ km at L₁ and (250 x 675) 10³ km at L₂, sizes denoting the maximum excursion from the libration point in the x and y directions respectively.
2013, Daniel García Yárnoz, Joan-Pau Sanchez, Colin R. McInnes, “Chapter 21: Opportunities for Asteroid Retrieval Missions”, in Viorel Badescu, editor, Asteroids: Prospective Energy and Material Resources, Springer, page 486:2013, Yuhui Zhao, Shoucun Hu, Xiyun Hou, Lin Liu, Chapter 39: On Nominal Formation Flying Orbit with a Small Solar System Body, Rongjun Shen, Weiping Qian (editors), Proceedings of the 26th Conference of Spacecraft TT&C Technology in China, Tsinghua University Press, Springer, Lecture Notes in Electrical Engineering 187, page 395, If the ratio of the amplitude in x-direction to γ₁ keeps unchanged (=0.155), the periods of halo orbits are almost the same (about 190 days). As a result of the stability of CRTBP and the dynamics of halo orbit formation, nominal halo orbits do not exist if the ratio is too large or too small.
Forms
| Spelling | Features | Labels | Source |
|---|---|---|---|
| halo orbits | Number=Plur | lexicographic |
Hypernyms
Relateds
Lissajous orbit · Lyapunov orbit
Translations (3)
de Halo-Orbit (type of orbit about a Lagrange point) · it orbita halo (type of orbit about a Lagrange point) · fr orbite de halo (type of orbit about a Lagrange point)