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You searched for subject:(L4 L5). Showing records 1 – 2 of 2 total matches.

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University of Colorado

1. Lathrop, Brian Wesley. An Investigation of Alternate Transfer Strategies to the Sun-Earth Triangular Lagrangian Points.

Degree: PhD, Aerospace Engineering Sciences, 2014, University of Colorado

Techniques for low energy transfers have been applied to constructing trajectories to various locations in the solar system. Previous techniques have concentrated on orbit matching trajectory maneuvers and two-body transfers. This research investigates several strategies for low energy transfers that can be utilized to intersect desirable objects or locate to different equilibrium regions in the solar system. The principle tools utilized in this investigation stem from the three-body problem and the development of Lagrangian equilibrium points, periodic orbits and invariant manifolds. Another principle tool is the use of low thrust propulsion to develop low energy transfer trajectories utilizing long duration flight times. Of primary interest is the transfer to the Sun-Earth triangular equilibrium Lagrange points, commonly referred to as L4 and L5. Given the localized stability of these regions leading and trailing the Earth as it orbits the Sun, there is low cost to keep a spacecraft in these locations to perform scientific investigations. Of primary interest in the S-E L4/L5 regions is the study of small body Trojan asteroids and near Earth objects, stereoscopic solar observations, and various space weather and early warning solar storm detection. This research attempts to minimize the trajectory transfer cost in terms of velocity maneuver impacts. Advisors/Committee Members: George H. Born, Jeffrey S. Parker, Brandon Jones, Webster Cash, Rodney Anderson.

Subjects/Keywords: invariant manifolds; L4 L5; Lagrangian points; Low Energy Transfer; periodic orbits; three-body dynamics; Astrodynamics; Navigation, Guidance, Control and Dynamics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Lathrop, B. W. (2014). An Investigation of Alternate Transfer Strategies to the Sun-Earth Triangular Lagrangian Points. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/asen_gradetds/84

Chicago Manual of Style (16th Edition):

Lathrop, Brian Wesley. “An Investigation of Alternate Transfer Strategies to the Sun-Earth Triangular Lagrangian Points.” 2014. Doctoral Dissertation, University of Colorado. Accessed February 25, 2021. https://scholar.colorado.edu/asen_gradetds/84.

MLA Handbook (7th Edition):

Lathrop, Brian Wesley. “An Investigation of Alternate Transfer Strategies to the Sun-Earth Triangular Lagrangian Points.” 2014. Web. 25 Feb 2021.

Vancouver:

Lathrop BW. An Investigation of Alternate Transfer Strategies to the Sun-Earth Triangular Lagrangian Points. [Internet] [Doctoral dissertation]. University of Colorado; 2014. [cited 2021 Feb 25]. Available from: https://scholar.colorado.edu/asen_gradetds/84.

Council of Science Editors:

Lathrop BW. An Investigation of Alternate Transfer Strategies to the Sun-Earth Triangular Lagrangian Points. [Doctoral Dissertation]. University of Colorado; 2014. Available from: https://scholar.colorado.edu/asen_gradetds/84


Purdue University

2. Capdevila, Lucia R. A transfer network linking Earth, Moon, and the triangular libration point regions in the Earth-Moon system.

Degree: PhD, Aeronautics and Astronautics, 2016, Purdue University

In the near future, several space applications in the Earth-Moon system may require a spacecraft to hold a stable motion, but the transfer trajectory infrastructure to access such stable motions has not been fully investigated yet. The triangular libration points, L 4and L5, in the Earth-Moon system have long been thought of as ideal locations for a communications satellite. Recently, Distant Retrograde Orbits (DROs) and Near-Rectilinear Halo Orbits (NRHOs) near the Moon have been identified as motion of interest for manned and unmanned missions with a focus on operations in cislunar space. The triangular libration points, as well as lunar DROs and NRHOs describe special types of possible motion for a spacecraft/satellite that is influenced solely by the gravitational fields of the Earth and the Moon. What is common to the tree types of solutions is that they are practically stable, that is, a spacecraft/satellite can naturally follow the solution for extended periods of time without requiring significant course adjustment maneuvers. This investigation contributes to the infrastructure of a network of transfer trajectories connecting regions of stability located near the Earth, Moon, and the triangular libration points in the Earth-Moon system. Several transfer options between regions of stability are presented and discussed, including transfer options between Low Earth Orbit (LEO) and lunar DRO, lunar DRO and periodic orbits near L4 and L5, as well as lunar DRO and L 2 NRHOs. Advisors/Committee Members: Kathleen C. Howell, Kathleen C. Howell, Martin J. Corless, William A. Crossley, James M. Longuski.

Subjects/Keywords: Applied sciences; Earth-moon circular restricted three-body problem; L2 near-rectilinear halo orbit; L4; L5; Lunar distant retrograde orbit; Period-3 DRO; Transfer trajectory; Triangular/equilateral libration/lagrangian points; Aerospace Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Capdevila, L. R. (2016). A transfer network linking Earth, Moon, and the triangular libration point regions in the Earth-Moon system. (Doctoral Dissertation). Purdue University. Retrieved from https://docs.lib.purdue.edu/open_access_dissertations/628

Chicago Manual of Style (16th Edition):

Capdevila, Lucia R. “A transfer network linking Earth, Moon, and the triangular libration point regions in the Earth-Moon system.” 2016. Doctoral Dissertation, Purdue University. Accessed February 25, 2021. https://docs.lib.purdue.edu/open_access_dissertations/628.

MLA Handbook (7th Edition):

Capdevila, Lucia R. “A transfer network linking Earth, Moon, and the triangular libration point regions in the Earth-Moon system.” 2016. Web. 25 Feb 2021.

Vancouver:

Capdevila LR. A transfer network linking Earth, Moon, and the triangular libration point regions in the Earth-Moon system. [Internet] [Doctoral dissertation]. Purdue University; 2016. [cited 2021 Feb 25]. Available from: https://docs.lib.purdue.edu/open_access_dissertations/628.

Council of Science Editors:

Capdevila LR. A transfer network linking Earth, Moon, and the triangular libration point regions in the Earth-Moon system. [Doctoral Dissertation]. Purdue University; 2016. Available from: https://docs.lib.purdue.edu/open_access_dissertations/628

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