Orbit Determination of the Asteroid (469219) Kamoòalewa and Its Error Analysis |
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| Institution: | 1. Yunnan Astronomical Observatories, Chinese Academy of Sciences, Kunming 650011;2. University of Chinese Academy of Sciences, Beijing 100049;3. Institute of Space Physics, Luoyang Normal University, Luoyang 471934;4. Center for Astronomical Mega-Science, Chinese Academy of Sciences, Beijing 100012;1. Beijing Institute of Spacecraft Environment Engineering, Beijing 100094;2. National Key Laboratory of Science and Technology on Reliability and Environmental Engineering, Beijing 100094;3. Department of Engineering Physics, Tsinghua University, Beijing 100084;4. Key Laboratory of Particle & Radiation Imaging (Tsinghua University), Ministry of Education, Beijing 100084;1. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030;2. University of Chinese Academy of Sciences, Beijing 100049;1. School of Physical Science and Technology, Xinjiang University, Urumqi830046;2. Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi830011;3. Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Nanjing210023;4. Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing,Guiyang 550001;1. Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216;2. Center for Astronomical Mega-Science, Chinese Academy of Sciences, Beijing 100012;3. University of Chinese Academy of Sciences, Beijing 100049;4. Kunming University of Science and Technology, Kunming 650031;5. National Space Science Center, Chinese Academy of Sciences, Beijing 100190;6. Beijing Key Laboratory of Space Environment Exploration, Beijing 100190;7. Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094;8. Purple Mountain Observatories, Chinese Academy of Sciences, Nanjing 210008;9. School of Earth and Space Sciences, Peking University, Beijing 100871;10. Key Laboratory of Solar Activity, Chinese Academy of Sciences, Beijing 100012;11. Institute of Space Sciences, Shandong University (Weihai), Shandong 264209;12. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012;13. Innovation Academy for Microsatellites, Chinese Academy of Sciences, Shanghai 201203;14. School of Space and Environment, Beihang University, Beijing 100191;15. School of Astronomy and Space Science, Nanjing University, Nanjing 210093;1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023;2. Key Laboratory for Space Object and Debris Observation, Chinese Academy of Sciences, Nanjing 210023;3. University of Chinese Academy of Sciences, Beijing 100049 |
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| Abstract: | As an Earth co-orbital asteroid, (469219) Kamoòalewa is a near earth object (NEO) with high value of research, and one of the targets explored by the first Chinese asteroid exploration mission. Given its orbit characteristics, we build a refined dynamical model for this asteroid, in which the effects induced by nonspherical gravitational fields of the Sun, the Earth, and the Moon are combined. On the basis of the dynamical model of the asteroid (469219) Kamoòalewa, its orbit is determined with optical data from 2004 to 2018 available on the Minor Planet Center (MPC) database. The root mean square error of post-fit residuals is about 0.2 arc second (comparable with that of the Jet Propulsion Laboratory (JPL)/Horizons), and the post-fit residuals of optical observations in 2004 are decreased. At the end, we implement error analysis on the asteroid (469219) Kamoòalewa's orbit in detail, and also predict its orbit error at the time interval between 2020 and 2025. |
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| Keywords: | Astrometry Celestial mechanics ephemerides asteroids: individual: (469219) Kamoòalewa |
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