![]() We also used the available astrometric observations of Phaethon, including those obtained by the Arecibo radar and the Gaia spacecraft, to constrain the secular drift of the orbital semimajor axis. We used the newly obtained optical light curves to improve the spin and shape model of Phaethon and to determine its surface physical properties derived by thermophysical modeling. The recent close approach of the near-Earth asteroid (3200) Phaethon offered a rare opportunity to obtain high-quality observational data of various types.Īims. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USAĭepartment of Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot 0076100, IsraelĪstronomical Institute, Academy of Sciences of the Czech Republic,įričova 1, 25165 Ondřejov, Czech RepublicĬenter for Solar System Studies, 11355 Mount Johnson Court, Rancho Cucamonga, CA 91737, USAĬenter for Solar System Studies, 446 Sycamore Ave., Eaton, CO 80615, USAĬontext. Institute of Astronomy, Charles University, Prague, V Holešovičkách 2, 18000 Prague 8, Czech RepublicĮ-mail: Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, France
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