The dynamical environment of asteroid 21 Lutetia according to different internal models

Autor(es)

Aljbaae, S. ; Chanut, T. G. G. ; Carruba, V. ; Souchay, J. ; Prado, A. F. B. A. ; Amarante, A.

• Tipo de documento: Artigo Científico
• Fonte: Monthly Notices of the Royal Astronomical Society; v. 464, n. 3, p. 3552-3560, JAN 2017.
• Citações Web of Science: 13

Resumo

One of the most accurate models currently used to represent the gravity field of irregular bodies is the polyhedral approach. In this model, the mass of the body is assumed to be homogeneous, which may not be true for a real object. The main goal of the this paper is to study the dynamical effects induced by three different internal structures (uniform, three- and four-layered) of asteroid (21) Lutetia, an object that recent results from space probe suggest being at least partially differentiated. The Mascon gravity approach used in the this work consists of dividing each tetrahedron into eight parts to calculate the gravitational field around the asteroid. The zero-velocity curves show that the greatest displacement of the equilibrium points occurs in the position of the E4 point for the four-layered structure and the smallest one occurs in the position of the E3 point for the three-layered structure. Moreover, stability against impact shows that the planar limit gets slightly closer to the body with the four-layered structure. We then investigated the stability of orbital motion in the equatorial plane of (21) Lutetia and propose numerical stability criteria to map the region of stable motions. Layered structures could stabilize orbits that were unstable in the homogeneous model. (AU)

• Processo FAPESP: 14/06762-2 - Famílias de asteroides em ressonâncias seculares
• Beneficiário: Valerio Carruba
• Linha de fomento: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/15357-1 - Efeito a longo prazo das massas (e sua incertidão) dos asteroides massivos sobre a evolução orbital de planetas terrestres e corpos menores
• Beneficiário: Safwan Aljbaae
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 16/04476-8 - Limitações sobre os campos de velocidades de ejeção terminais das famílias de asteroides
• Beneficiário: Valerio Carruba
• Linha de fomento: Auxílio à Pesquisa - Regular