The near-Earth asteroid 3200 Phaethon (1983 TB) is an attractive object not only from a scientific viewpoint but also because of JAXA's DESTINY+ target. The rotational lightcurve and spin properties were investigated based on the data obtained in the ground-based observation campaign of Phaethon. We aim to refine the lightcurves and shape model of Phaethon using all available lightcurve datasets obtained via optical observation, as well as our time-series observation data from the 2017 apparition. Using eight 1-2-m telescopes and an optical imager, we acquired the optical lightcurves and derived the spin parameters of Phaethon. We applied the lightcurve inversion method and SAGE algorithm to deduce the convex and non-convex shape model and pole orientations. We analysed the optical lightcurve of Phaethon and derived a synodic and a sidereal rotational period of 3.6039 h, with an axis ratio of a/b = 1.07. The ecliptic longitude (lambda) and latitude (beta) of the pole orientation were determined as (308, -52) and (322, -40) via two independent methods. A non-convex model from the SAGE method, which exhibits a concavity feature, is also presented.
@article{arxiv.1809.05900,
title = {Optical observations of NEA 3200 Phaethon (1983 TB) during the 2017 apparition},
author = {Myung-Jin Kim and Hee-Jae Lee and Sang-Min Lee and Dong-Heun Kim and Fumi Yoshida and Przemyslaw Bartczak and Grzegorz Dudzinski and Jintae Park and Young-Jun Choi and Hong-Kyu Moon and Hong-Suh Yim and Jin Choi and Eun-Jung Choi and Joh-Na Yoon and Alexander Serebryanskiy and Maxim Krugov and Inna Reva and Kamoliddin E. Ergashev and Otabek Burkhonov and Shuhrat A. Ehgamberdiev and Yunus Turayev and Zhong-Yi Lin and Tomoko Arai and Katsuhito Ohtsuka and Takashi Ito and Seitaro Urakawa and Masateru Ishiguro},
journal= {arXiv preprint arXiv:1809.05900},
year = {2018}
}
Comments
14 pages, 4 figures, 1 figure in Appendix A. Accepted for publication in Astronomy & Astrophysics (A&A)