Download or read book Analysis of the Effects of Lunar Asphericity on Lunar Satellite Orbits written by Gerald N. Klemushin and published by . This book was released on 1967 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Gravitational model Selection on Accuracy of Lunar Orbit Determination from Short Data Arcs written by Harold A. Hamer and published by . This book was released on 1969 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of Lunar and Solar Effects on the Motion of Close Earth Satellites written by James P. Murphy and published by . This book was released on 1966 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of Higher Order Effects on Low Altitude Lunar Orbits Caused by Irregularities in Mass Distribution written by Guillermo Castro Martinez and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of humanity's greatest challenges is space exploration and conquering the solar system. The exploration and investigation of celestial bodies such as the Moon is paramount to becoming a space-faring civilization. As more spacecraft are deployed to lunar orbits for scientific research, more resources are exhausted for station-keeping. The Moon's gravitational irregularities, caused by uneven mass distributions, inflict small perturbations on orbiting bodies. These perturbations can over time severely impact the orbits of nearby spacecraft and jeopardize the research being conducted. A deeper understanding of the magnitudes and locations of these perturbations is required for orbiting spacecraft to maintain a stable orbit. A gravitational model of the moon, using higher-order spherical harmonics methods and empirical data collected in the NASA GRAIL mission, was developed, and used to measure the gravitational perturbations of the Moon. Equations of motion accounting for the higher-order gravitational effects were integrated over time in the MATLAB software, given a set of initial conditions, to depict the resulting orbital trajectory of a lunar spacecraft. The effects of these perturbations on the orbital elements of low lunar orbits with different inclinations were analyzed. The results show that the semi-major axis, eccentricity, and inclination of the orbit have a linear relationship in time. Consequentially, the radius of periapsis experiences a gradual linear decrease eventually resulting in a collision with the lunar surface. Thus, systems must be implemented into lunar satellites that counteract the effects of the gravitational perturbations thereby increasing the lifespan of the spacecraft and the mission.
Download or read book Lifetimes of Lunar Satellite Orbits written by Kurt W. Meyer and published by . This book was released on 1994 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Eccentricity of the Lunar Orbit Oblateness of the Earth and Solar Gravitational Field on Lunar Trajectories written by William H. Michael and published by . This book was released on 1960 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lifetimes of Lunar Satellite Orbits written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-05 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Space Exploration Initiative has generated a renewed interest in lunar mission planning. The lunar missions currently under study, unlike the Apollo missions, involve long stay times. Several lunar gravity models have been formulated, but mission planners do not have enough confidence in the proposed models to conduct detailed studies of missions with long stay times. In this report, a particular lunar gravitational model, the Ferrari 5 x 5 model, was chosen to determine the lifetimes for 100-km and 300-km perilune altitude, near-circular parking orbits. The need to analyze orbital lifetimes for a large number of initial orbital parameters was the motivation for the formulation of a simplified gravitational model from the original model. Using this model, orbital lifetimes were found to be heavily dependent on the initial conditions of the nearly circular orbits, particularly the initial inclination and argument of perilune. This selected model yielded lifetime predictions of less than 40 days for some orbits, and other orbits had lifetimes exceeding a year. Although inconsistencies and limitations are inherent in all existing lunar gravity models, primarily because of a lack of information about the far side of the moon, the methods presented in this analysis are suitable for incorporating the moon's nonspherical gravitational effects on the preliminary design level for future lunar mission planning. Meyer, Kurt W. and Buglia, James J. and Desai, Prasun N. Langley Research Center RTOP 506-49-11-01...
Download or read book Sensitivity of Short period Tracking Data from a Lunar Satellite to the Lunar Gravitational Field Harmonics written by William R. Wells and published by . This book was released on 1965 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Earth Moon System as a Dynamical Laboratory written by Elisa Maria Alessi and published by Frontiers Media SA. This book was released on 2019-09-25 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Earth-Moon neighborhood is the scene of a large variety of applications that concern asteroids, lunar exploration and space debris in Earth orbit. In particular, recent efforts by the scientific community have focused on the possibility of extending the human operations beyond the radiation belts; of exploiting in-situ resources, either on the lunar surface or on asteroids retrieved to the vicinity of the Earth; and of mitigating the space debris concern by taking advantage of the lunar perturbation. The characteristic dynamics in the cislunar space represents an opportunity for the mission designer, but also a challenge in terms of theoretical understanding and operational control. This Research Topic covers the Earth-Moon dynamics in its complexity and allure, considering the most relevant aspects for both natural and artificial objects, in order to get a new comprehension of the dynamics at stake along with the operational procedures that can handle it.
Download or read book Some Higher Order Analyses of Earth and Lunar Orbiters written by Stanford University. Department of Aeronautics and Astronautics and published by . This book was released on 1971 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report is concerned with the accurate modelling of the translational behavior of a drag-free satellite in an almost circular near-earth orbit. Specifically, all of the short period and long period position fluctuations in the satellite's coordinates down to one meter in amplitude are determined. Considered in the equations of motion are the general zonal and tesseral harmonic effects as well as the lunar and solar effects. The results of the study will allow the efficient evaluation of information about the gravity field from special low altitude small eccentricity orbits selected for drag-free operation. A non-canonical approach is followed. A mean orbital plane is chosen in such a way that no short period out-of-plane fluctuations greater than second order occur. This frame of reference undergoes long period changes in inclination and nodal position. The short period radial and cross-track fluctuations are computed as a function of position along the orbit. The in-track fluctuations are determined by the solution of the time equation. These fluctuations are derived from Lagrange's Planetary Equations. (Author).
Download or read book Error Analysis of a Weighted Least Squares Process to Determine the Lunar Gravitational Field written by Robert H. Tolson and published by . This book was released on 1966 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Physical Librations of the Moon on the Orbital Elements of a Lunar Satellite written by A. J. Ferrari and published by . This book was released on 1971 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book BTL Talks and Papers written by Bell Telephone Laboratories. Technical Information Libraries and published by . This book was released on 1967 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of Lunar and Solar Effects on the Motion of Close Earth Satellites written by James P. Murphy and published by . This book was released on 1966 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analytical Lifetime Studies of a Close lunar Satellite written by William R. Wells and published by . This book was released on 1965 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lifetimes of Lunar Satellite Orbits written by Meyer. Kurt W. and published by . This book was released on 1991 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bell Laboratories Talks and Papers written by Bell Telephone Laboratories. Libraries and Information Systems Center and published by . This book was released on 1967 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt:
