1. A new non-convex model of the binary asteroid 90 Antiope obtained with the SAGE modelling technique
- Author
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P. Wietrzycka, W. Dimitrow, Grzegorz Dudziński, Magdalena Polińska, Frédéric Vachier, R. Hirsch, M. Murawiecka, Agnieszka Kryszczyńska, P. Bartczak, F. Colas, A. Marciniak, G. Apostolovska, Jakub Nadolny, Toni Santana-Ros, and Joe Pollock
- Subjects
Earth and Planetary Astrophysics (astro-ph.EP) ,Physics ,010504 meteorology & atmospheric sciences ,Scale (ratio) ,FOS: Physical sciences ,Binary number ,Astronomy and Astrophysics ,Astrophysics ,Density estimation ,Computational Physics (physics.comp-ph) ,Lambda ,Orbital period ,01 natural sciences ,Occultation ,Combinatorics ,Photometry (optics) ,Space and Planetary Science ,Asteroid ,0103 physical sciences ,Astrophysics::Earth and Planetary Astrophysics ,Physics - Computational Physics ,010303 astronomy & astrophysics ,Astrophysics::Galaxy Astrophysics ,Astrophysics - Earth and Planetary Astrophysics ,0105 earth and related environmental sciences - Abstract
We present a new non-convex model of the 90 Antiope binary asteroid, derived with a modified version of the SAGE (Shaping Asteroids with Genetic Evolution) method using disk-integrated photometry only. A new variant of the SAGE algorithm capable of deriving models of binary systems is described. The model of 90 Antiope confirms the system's pole solution ($\lambda=199^{\circ}$, $\beta=38^{\circ}$, $\sigma=\pm5^{\circ}$) and the orbital period ($16.505046 \pm 0.000005$ h). A comparison between the stellar occultation chords obtained during the 2011 occultation and the projected shape solution has been used to scale the model. The resulting scaled model allowed us to obtain the equivalent radii ($R_{1}=40.4\pm0.9$ km and $R_{2}=40.2\pm0.9$ km) and the distance between the two system components ($176\pm4$ km), leading to a total system mass of ($9.14\pm0.62$)$\cdot10^{17}$ kg. The non-convex shape description of the components permitted a refined calculation of the components' volumes, leading to a density estimation of $1.67\pm0.23$ g cm$^{-3}$. The intermediate-scale features of the model may also offer new clues on the components' origin and evolution.
- Published
- 2014