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- Tsuko Nakamura
- 1University of the Air, 2-11 Wakaba, Mihama-ku, Chiba 261-8586 tsukonk@yahoo.co.jp
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- Fumi Yoshida
- 2National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 fumi.yoshida@nao.ac.jp
抄録
<jats:p>We constructed a new surface number density distribution model for Jovian Trojans around the L4 or L5 libration point of Jupiter. This is an empirical asymmetric model of the Maxwellian-Gaussian type, derived from numerical integrations of orbital motions for actual Trojan asteroids around the L4 point. With this model, in combination with the observed surface number densities obtained by Yoshida and Nakamura (2005, AJ, 130, 2900; 2008, PASJ, 60, 297), we estimate that the total populations of L4 and L5 Trojans with diameters $(D)>$ 2 km are (6.3$\pm$1.0) $\times$ 10$^{4}$ and (3.4$\pm$0.5) $\times$ 10$^{4}$, respectively. These results indicate that the L4 total populations ($D>$ 2 km) calculated previously by Jewitt, Trujillo, and Luu (2000, AJ, 120, 1140) and by Yoshida and Nakamura (2005, ibid.) using the former’s isotropic Gaussian model are overestimated by a factor of 3–4.</jats:p>
収録刊行物
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- Publications of the Astronomical Society of Japan
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Publications of the Astronomical Society of Japan 60 (2), 293-296, 2008-04-25
Oxford University Press (OUP)