Bibcode
Moskovitz, Nicholas; Oszkiewicz, Dagmara; Skiff, Brian; Kankiewicz, Pawel; Licandro, J.; Galiazzo, Mattia; Zeilinger, Werner
Referencia bibliográfica
American Astronomical Society, DPS meeting #48, id.#327.05
Fecha de publicación:
10
2016
Número de citas
0
Número de citas referidas
0
Descripción
Most Howardite-Eucrite-Diogenite (HED) meteorites (analogues to V-type
asteroids) are thought to originate from asteroid (4) Vesta. However
some HEDs show distinct oxygen isotope ratios and therefore are thought
to originate from other asteroids. In this study we try to identify
asteroids that may represent parent bodies of those mismatching HEDs. In
particular the origin of the anomalous Bunburra Rockhole meteorite was
traced back to the inner main asteroid belt, showing that there might be
asteroids that are not genetically linked to the asteroid (4) Vesta (the
main source of V-type asteroids and HED meteorites) in the inner main
belt. In this work we identify V-type asteroids outside the dynamical
Vesta family whose rotational properties (retrograde vs prograde
rotation) suggest the direction of Yarkovsky drift that sets them apart
from typical Vestoids and Vesta fugitives. Specificly Nesvorny et al.
2008 simulated escapes paths from the Vesta family and showed that
typical Vesta fugitives in the inner main asteroid belt at semi-major
axis a < 2.3 AU have to have retrograde rotations and physical and
thermal parameters that maximize the Yarkovsky force in order to evolve
to scattered orbits within 1-2 Gys (age of the Vesta collisional
family). Therefore large asteroids outside the Vesta family and with a
< 2.3 AU and having thermal and rotational properties minimizing the
Yarkovsky drift or showing Yarkovsky drift direction towards (4) Vesta
are the best candidates for non-Vestoidal V-type asteroids and therefore
parent bodies of anomalous HED. In this study we have performed accurate
photometric observations and determined sense of rotation for several
asteroids testing their links to Vesta and anomalous HED. We have found
several potential non-Vestoid candidates. Those objects have to be
studied in more detail to fully confirm their link to anomalous HEDs.