Aaron J Rosengren
- Assistant Professor, Aerospace-Mechanical Engineering
- Assistant Professor, Applied Mathematics - GIDP
Is currently an Assistant Professor in the Aerospace and Mechanical Engineering Department at the University of Arizona, focusing on SSA and Astrodynamics research. Formerly, he was a Postdoctoral Researcher at the Aristotle University of Thessaloniki in the Department of Physics as part of the EU H2020 Project ReDSHIFT. He also spent two years as an Experienced Researcher at the Institute of Applied Physics "Nello Carrara" of the Italian National Research Council as part of the Stardust Asteroid and Space Debris Network. He earned a B.S. in Mathematics and a B.S. in Mechanical Engineering from the University of Missouri, and was awarded an M.S. and a Ph.D. in Aerospace Engineering Sciences from the University of Colorado at Boulder, working with Prof. Dan Scheeres as a member of the Colorado Center for Astrodynamics Research. Research interests include space situational awareness, orbital debris, planetary science, celestial mechanics, and dynamical astronomy
- 2018 Junior Faculty Award for Excellence at the Student Interface
- AME, UA, Spring 2018
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Advanced AstrodynamicsAME 559 (Fall 2018)
Orbit Mech+Space FlightAME 457 (Fall 2018)
Orbit Mech/Space FlightAME 557 (Fall 2018)
ResearchAME 900 (Fall 2018)
DynamicsAME 250 (Spring 2018)
Independent StudyAME 599 (Spring 2018)
Independent StudyAME 599 (Fall 2017)
Orbit Mech+Space FlightAME 457 (Fall 2017)
Orbit Mech/Space FlightAME 557 (Fall 2017)
- Daquin, J., Gkolias, I., & Rosengren, A. J. (2018). Drift and its mediation in terrestrial orbits. Frontiers in Applied Mathematics and Statistics.More infoThe slow deformation of terrestrial orbits in the medium range, subject tolunisolar resonances, is well approximated by a family of Hamiltonian flow with$2.5$ degree-of-freedom. The action variables of the system may experiencechaotic variations and large drift that we may quantify. Using variationalchaos indicators, we compute high-resolution portraits of the action space.Such refined meshes allow to reveal the existence of tori and structuresfilling chaotic regions. Our elaborate computations allow us to isolate preciseinitial conditions near specific zones of interest and study their asymptoticbehaviour in time. Borrowing classical techniques of phase- spacevisualisation, we highlight how the drift is mediated by the complement of thenumerically detected KAM tori.
- Amato, D., Furfaro, R., Rosengren, A. J., & Maadani, M. (2018, September). Attitude propagation of resident space objects with recurrent neural networks. In Advanced Maui Optical and Space Surveillance Technologies Conference.
- Rosengren, A. J. (2018, September). Passive debris removal using orbital resonances. In Advanced Maui Optical and Space Surveillance Technologies Conference.
- Rosengren, A. J., Amato, D., & Bombardelli, C. (2018, 2018-01-11). THALASSA: a fast orbit propagator for near-Earth and cislunar space. In AIAA SciTech Forum.More infoWe present THALASSA, a fast non-averaged orbit propagation Fortran code for the Earth-Moon system implementing regularized formulations of dynamics. THALASSA uses a variable step-size and order solver to integrate Newtonian equations of motion, the Kustaanheimo-Stiefel formulation, and a regularized set of orbital elements. It includes perturbations from a 15 x 15 geopotential, atmospheric drag, the Sun, the Moon, and SRP. Close encounters with the Moon are handled efficiently through a trajectory splitting algorithm, in which the primary body is switched during the integration. We compare our code to the semi-analytical orbit propagator STELA in several numerical experiments. In the 75-year propagation of a HEO orbit with large semi-major axis, the non-averaged regularized element set implemented in THALASSA is able to accurately recover the position along the orbit with a CPU time of about 10 s, while the Cowell formulation and STELA fail to do so. For the 200-year propagation of the IBEX spacecraft, in a 3 : 1 mean-motion resonance with the Moon, the qualitative evolution of the orbit can only be re- produced with the non-averaged formulations. The code also displays a satisfactory performance for navigational satellite orbits, in which STELA is more efficient. We expect additional gains in efficiency for Molniya-type orbits and in the estimation of lifetime for LEO orbits.
- Rosengren, A. J., Correa, J. R., & Scheeres, D. J. (2018, August). Mean values in elliptic motion: averaging the Legendre polynomials. In AAS/AIAA Astrodynamics Specialist Conference.
- Rosengren, A. J., Amato, D., Daquin, J., & Gkolias, I. (2017, 2017-06-20). The Dynamical Placement of Satellite Constellations and Designing for Demise. In 9th International Workshop on Satellite Constellations and Formation Flying.More infoThe dynamical environment occupied by satellite constellations is subject to mo- tions that have widely disparate timescales: the earthly day, the lunar month, the solar year, and various precession frequencies ranging from a few years to nearly 26 000 years for the equinoxes. This provision of frequencies in the Earth-Moon- Sun system gives rise to a diverse range of complex resonant phenomena associ- ated with orbital motions. Resonances can have a profound effect on the long-term dynamics of the system, giving rise to a rich spectrum of highly complicated be- haviors. Such resonant perturbations are the most important mechanism for deliv- ering distant Earth-orbiting satellites into the regions where atmospheric drag can start their decay. We have previously found that even in the medium-Earth orbit (MEO) region, without the destabilizing influence of drag, there exist many dy- namical pathways that can be used to effectively clear this distant region of space from any future collision hazard. Building on the lessons learned in MEO, we introduce here a new prospective into the mission analysis and design of satellite constellations, showing how a more holistic approach that incorporates dynamics into the early design phase can aid efforts in space debris mitigation and remediation. We emphasize the importance of conducting (a priori) detailed dynamical surveys of the neighboring operational regions, and incorporating lifetime estimates as a new constraint in the launch window analysis. Such dynamical assessments could have a profound and tangible influence on constellation design, perhaps attacking the debris problem at its source
- Amato, D., & Rosengren, A. J. (2018, 2018-06-25). A non-averaged approach to the numerical cartography of the LEO region. 5th European Workshop on Space Debris Modelling and Remediation. CNES HQ, Paris, France: CNES.
- Amato, D., Rosengren, A. J., & Furfaro, R. (2018, July). Solving the main problem in satellite theory through recurrent neural networks. 42nd Scientific Assembly of the Committee on Space Research (COSPAR). Pasadena, California.
- Namazyfard, H., Amato, D., & Rosengren, A. J. (2018, July). Lifetime analysis in launch window maps: designing satellite orbits for demise. 42nd Scientific Assembly of the Committee on Space Research (COSPAR). Pasadena, California.
- Namazyfard, H., Rosengren, A. J., & Amato, D. (2018, November). Lifetime analysis in launch window maps: designing satellite orbits for demise. CODER 2018 Workshop on Orbital Debris Education and Research. College Park, Maryland.
- Reiland, N., Amato, D., Bombardelli, C., & Rosengren, A. J. (2018, November). The dynamical placement of mega-constellations. CODER 2018 Workshop on Orbital Debris Education and Research. College Park, Maryland.
- Reiland, N., Aschenbrenner, M., Amato, D., & Rosengren, A. J. (2018, July). The dynamical placement of mega-constellations. 42nd Scientific Assembly of the Committee on Space Research (COSPAR). Pasadena, California.
- Rosengren, A. J. (2018, 2018-06-15). Orbital Resonances and Averaging in the Motion of Satellites. Invited Seminar. Politecnico di Milano, Dipartimento di Scienze e Tecnologie Aerospaziali.More infoMany physical systems can be modeled as having an underlying dynamical skeleton that organizes and governs how all the possible behaviors are related. The global properties of multidimensional, nearly integrable Hamiltonian systems are determined by the relative location and size of the predominant resonances. The dynamical model governing satellite motion (assuming non-commensurate orbital frequencies) is referred to in the astrophysical and celestial dynamics communities as the quadrupolar, secular, hierarchical restricted four-body problem with an oblate primary. In the non-autonomous case, this model degenerates to either the classical Kozai-Lidov mechanism or the critical inclination resonances. In the time-dependent model, brought about in this case by the Moon's perturbed motion, secular resonances involving the frequencies of perturbed motions become woven throughout the inclination, eccentricity, and semi-major axis space in an exceedingly complicated web-like structure, emanating from the classical critical inclinations. In this talk, I will review this 2.5 degree-of-freedom Hamiltonian system from both a Gauss averaging and Laplace-Lagrange secular theory perspective. It is the structure of the satellite and the nature of its orbit that determine which perturbations are significant and which are negligible. In this sense, every distinct problem conditions its particular scheme of computation, and many refinements, sometimes reducing the always elaborate calculations in a marked degree, depend on a careful examination of the dynamical situation. I will show the breakdown of our basic dynamical model in the presence of resonances of a non-secular origin and close encounters with the Moon.
- Rosengren, A. J. (2018, December). Dynamical phenomena in the Earth orbiter problem and their implications for celestial mechanics (Keynote). XIX Coloquio Brasileiro de Dinamica Orbital, CBDO, 2018. Sao Jose dos Campos, SP, Brazil.
- Rosengren, A. J. (2018, July). Artificial Earth satellites as a natural dynamical laboratory. invited talk presented at the CMS Summer School 2018 in Applied Mathematics. Technion, Haifa, Israel.
- Rosengren, A. J. (2018, November). Circumterrestrial orbital dynamics and new results for space situational awareness and space debris. invited research seminar in the Daniel Guggenheim School of Aerospace Engineering, Georgia Institute of Technology. Atlanta, Georgia.
- Rosengren, A. J. (2018, September). Physical aspects of satellite orbit prediction. invited research seminar in the Department of Physics Colloquium, University of Arizona. Tucson, Arizona.
- Rosengren, A. J., Daquin, J., & Gkolias, I. (2018, 2018-04-19). Chaotic Transport in Circumterrestrial Orbits. AAS/DDA 2018 Meeting. Pasadena, CA: American Astronomical Society Division on Dynamical Astronom.More infoThe slow deformation of circumterrestrial orbits in the medium region, subject to lunisolar secular resonances, is well approximated by a Hamiltonian system with 2.5 degrees of freedom. This dynamical model is referred to in the astrophysical and celestial dynamics communities as the quadrupolar, secular, hierarchical three-body problem, and, in the non-autonomous case, gives rise to the classical Kozai-Lidov mechanism. In the time-dependent model, brought about in our case by the Moon's perturbed motion, the action variables of the system may experience chaotic variations and large drifts due to the possible overlap of nearby resonances. Using variational chaos indicators, we compute high-resolution portraits of the action space, revealing the existence of tori and structures filling chaotic regions. Our refined and elaborate calculations allow us to isolate precise initial conditions near specific areas of interest and to study their asymptotic behavior in time. We highlight in particular how the drift in phase space is mediated by the complement of the numerically detected KAM tori. Despite their reputed normality, Earth satellite orbits can possess an extraordinarily rich spectrum of dynamical behaviors, and, like the small body remnants of Solar system formation, they have all the complications that make them very interesting candidates for testing the modern tools of chaos theory.
- Rosengren, A. J., Skoulidou, D., Tsiganis, K., & Voyatzis, G. (2018, 2018-06-26). Dynamical Systems Approach to Debris Mitigation and Remediation. 5th European Workshop on Space Debris Modelling and Remediation. CNES HQ, Paris, France: CNES.More infoThis work focuses on the evolution of satellites and space debris as dynamical systems with the overall intent being to identify and study the different `life cycles' which these bodies go through. Recent advances in our understanding of the dynamical processes that act on these artificial celestial bodies predict that they may undergo significant chaotic drifts in circumterrestrial phase space throughout their existence. We study the implications of coupled gravitational and non-gravitational perturbations on their long-term orbital dynamics, and show how secular and semi-secular resonances can profoundly affect the behavior of these bodies, in both dissipative and Hamiltonian settings. In this talk, we will present the most complete to date dynamical atlas of the entire usable circumterrestrial space, characterizing the long-term evolution of Earth satellites from LEO to GEO and beyond, for the purposes of passive debris mitigation and remediation. In some regions, the overlapping of the predominant resonances furnish a number of interesting disposal hatches at moderate to low eccentricity orbits. For satellites equipped with an on-board, area-augmenting device to increase their area-to-mass ratios at the end of life, solar radiation pressure was found to generally promote the deorbiting process, particularly at the transition region between LEO and MEO. Here we will link these cartographic stability maps to the appropriate disposal strategy or deorbiting device for any operational orbit, and we highlight in particular how such dynamical assessments can have a profound and tangible influence on space debris remediation though the passive debris removal ideology. Although direct reentry from very low eccentricities is very unlikely in most cases of interest, we find that a modest ``delta-v'' budget would be enough for satellites to be steered into a relatively short-lived resonance and achieve reentry into the Earth's atmosphere within realistic timescales. The solution to the debris proliferation problem throughout all space regions can only be found by coupling a deep understanding of the dynamical environments occupied by artificial satellites and space debris with technical, political, and legal solutions.
- Rosengren, A. J., Skoulidou, D., Tsiganis, K., & Voyatzis, G. (2017, 2017-07-04). Killing Satellites with Resonances: The Dynamics of Passive Debris Removal. 13th Hellenic Astronomical Conference. Heraklion, Crete.More infoOne of the main goals of the space debris community is to determine how to prevent debris from becoming so populous that it adversely affects operational satellites. Recent efforts have explored more passive means to curtail the growth rate of the debris population, by seeking to cleverly exploit the dynamical instabilities brought on by resonant perturbations to deliver retired Earth-orbiting satellites into the regions where atmospheric drag can start their decay. With a modest delta-v budget, satellites can be steered into a short-lived resonance, or passive systems can be deployed at the end of life like solar sail devices to enhance solar radiation pressure to bring satellites down earlier than would otherwise be the case. Having previously characterized the dynamical architecture of the circumterrestrial environment, from very low-altitude orbits up to the geostationary region and beyond, this talk will link these cartographic stability maps to the appropriate disposal strategy or deorbiting device for any operational orbit. We will highlight in particular how our previous dynamical assessments can have a profound and tangible influence on space debris mitigation though the passive debris removal ideology.
- Skoulidou, D., Rosengren, A. J., Tsiganis, K., & Voyatzis, G. (2017, 2017-07-04). Dynamical Study of the Near-Earth Space Environment for Passive Debris Removal. 13th Hellenic Astronomical Conference. Heraklion, Crete.More infoOnly during the past decade has the precarious state of the Earth's orbiting environment, permeated by clouds of space debris, been fully appreciated and understood. Both active and passive debris mitigation and removal techniques are designed to curtail the growth of the debris environment by limiting the amount of mass in preferential space regions that may lead to future collisions. The solution to the debris proliferation problem, however, can only be found by coupling these mitigation and remediation methods with a deep understanding of the dynamical environments occupied by artificial satellites and space debris. An attempt at this heuristic approach is presented herein. This work uses tools and practices that are common in celestial mechanics and dynamical systems theory, which have been applied successfully in studies on the long-term dynamics in the Solar System and on the design of satellite orbits, but have only just started to be applied to the dynamics of space debris in recent years, as did the need for extending our knowledge of these artificial celestial bodies on intervals longer than mission timescales. Though a cartography of stability maps, obtained using a suitably modified version of the SWIFT symplectic integration package (Levison \& Duncan, 1994), we characterize the whole circumterrestrial space from LEO to GEO for the purposes of passive debris removal using resonances. The overlap of the predominant lunisolar secular and semi-secular resonances furnish a number of interesting disposal hatches at moderate and low eccentricity orbits. We show, furthermore, that increasing the satellite's area-to-mass ratio using a solar sail helps promote the deorbiting process, through coupled gravitational and radiation pressure perturbations.
- Amato, D., Rosengren, A. J., & Baù, G. (2018, 2018-05-20). What happened to Luna-3? A numerical exploration of cislunar dynamics. John L. Junkins Dynamical Systems Symposium. Texas A&M University.More infoLuna-3 was the first spacecraft to perform a lunar flyby and to image the far side of the Moon. Launched in October 1959, it collided with the Earth in late March 1960. Such a short dynamical lifetime for a high-altitude orbit has often been attributed to an increase in eccentricity due to a Lidov-Kozai cycle. We study the evolution of the Luna-3 trajectory by generating accurate numerical solutions through the THALASSA regularized orbit propagation code, and comparing them to single- and double-averaged integrations. Lunar close encounters, which cannot be reproduced by semi-analytical integrations, affect the trajectory decisively by suppressing the double-averaged secular dynamics. Their manifestation is evident in the Lidov-Kozai representations of the flow, where close encounters cause impulsive changes in the osculating elements that cannot be predicted by the double-averaged dynamics. In the quadrupolar approximation with only the Sun as a perturber, large amplitudes of short-periodic terms (with respect to the Sun) cause flips of the orbital plane. Ultimately, we find that the demise of Luna-3 was caused by a complex interaction between lunar close encounters, short-periodic terms, and double-averaged dynamics. The spacecraft never described Lidov-Kozai cycles in a rigorous sense, since its argument of perigee did not enter a libration regime.
- Rosengren, A. J. (2018, 2018-05-20). Dynamical Systems Approach to Astrodynamics-Based Space Situational Awareness. John L. Junkins Dynamical Systems Symposium. Texas A&M University.More infoThis work focuses on the evolution of resident space objects as dynamical systems with the overall intent being to identify and study the different `life cycles' which these bodies go through. Recent advances in our understanding of the dynamical processes that act on these artificial celestial bodies predict that they may undergo significant chaotic drifts in circumterrestrial phase space throughout their existence. Here was the birth of a new ideology to remedy the space debris proliferation problem, based on a judicious use of the resulting instabilities to prescribe natural Earth re-entry itineraries and navigate the phase space. We present here recent results on the passive debris removal paradigm, and show how we can `kill' satellites using resonances. This work uses tools and practices that are common in astrophysical and celestial dynamics, but have only just started to be applied to the dynamics of space debris in recent years, as did the need for extending our knowledge of these bodies on intervals longer than mission timescales.