We present a new non-convex model of the binary asteroid (809) Lundia. A SAGE (Shaping Asteroids with Genetic Evolution) method using disc-integrated photometry only was used for deriving physical parameters of this binary system. The model of (809) Lundia improves former system's pole solution and gives the ecliptic coordinates of the orbit pole - λ=122∘, β=22∘, σ=±5∘ - and the orbital period of 15.41574±0.00001 h. For scaling our results we used effective diameter of Deff=9.6±1.1 km obtained from Spitzer observations. The non-convex shape description of the components permitted a refined calculation of the components' volumes, leading to a density estimation of 2.5±0.2 g/cm3 and macroporosity of 13-23\%. The intermediate-scale features of the model may also offer new clues on the components' origin and evolution.
@article{arxiv.1905.08336,
title = {A new non-convex model of the binary asteroid (809) Lundia obtained with the SAGE modelling technique},
author = {P. Bartczak and A. Kryszczyńska and G. Dudziński and M. Polińska and F. Colas and F. Vachier and A. Marciniak and J. Pollock and G. Apostolovska and T. Santana-Ros and R. Hirsch and W. Dimitrow and M. Murawiecka and P. Wietrzycka and J. Nadolny},
journal= {arXiv preprint arXiv:1905.08336},
year = {2019}
}