Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008pasj...60..293n&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.60, No.2, pp.293--296
Astronomy and Astrophysics
Astronomy
4
Jovian Trojans, Minor Planet, Asteroids, Solar System : General, Surface Density
Scientific paper
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)>2km are (6.3±1.0)×104 and (3.4±0.5) ×104, respectively. These results indicate that the L4 total populations (D> 2km) 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.
Nakamura Tsuko
Yoshida Fumi
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