| Texto completo | |
| Autor(es): |
Perna, D.
[1]
;
Alvarez-Candal, A.
[2]
;
Fornasier, S.
[1, 3]
;
Kanuchova, Z.
[1, 4]
;
Giuliatti Winter, S. M.
[5]
;
Vieira Neto, E.
[5]
;
Winter, O. C.
[5]
Número total de Autores: 7
|
| Afiliação do(s) autor(es): | [1] Univ Paris Diderot, Univ Paris 06, CNRS, LESIA Observ Paris, F-92195 Meudon - France
[2] Observ Nacl, BR-20921400 Rio De Janeiro - Brazil
[3] Univ Paris 07, F-75013 Paris - France
[4] Slovak Acad Sci, Astron Inst, Tatranska Lomnica 05960 - Slovakia
[5] Univ Estadual Paulista, Grp Dinam Orbital & Planetol, BR-12516410 Sp Guaratingueta - Brazil
Número total de Afiliações: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Astronomy & Astrophysics; v. 568, AUG 2014. |
| Citações Web of Science: | 8 |
| Resumo | |
Context. The Brazilian Aster project plans a space mission to rendezvous and characterize (153591) 2001 SN263, one of the only two known triple near-Earth asteroids (NEAs). Improving the knowledge of its physical properties is necessary to optimize the mission planning and science return. Aims. We study the surface composition and physical nature of 2001 SN263 by analyzing and comparing its reflectance spectra with laboratory spectra of minerals and meteorites. Methods. We performed spectroscopic observations of 2001 SN263 using the UV-to-NIR X-Shooter spectrograph at the ESO Very Large Telescope (VLT). Complementary photometric observations of the target were acquired with the FORS2 instrument. Results. We find B-type, featureless convex spectra (Themis-or Polana-like). 2001 SN263 presents the bluest visible spectrum ever observed for small bodies in the solar system, even bluer than NEAs Phaethon and Bennu. The spectra suggest that the surface composition is organic-and magnetite-rich, similar to that of heated CI carbonaceous chondrites. Phyllosilicates may be abundant as well. We find hints of a coarse-grained surface and composition variety within the triple system. Conclusions. Both the large grain size and surface variability might be connected to the formation of the triple system. The Aster mission will have the intriguing possibility of checking current models of asteroid binary formation. (AU) | |
| Processo FAPESP: | 11/08171-3 - Dinâmica orbital de pequenos corpos |
| Beneficiário: | Othon Cabo Winter |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |