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19 April 2024 |
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Shape and spin determination of Barbarian asteroids | | M. Devogèle
; P. Tanga
; P. Bendjoya
; J.P. Rivet
; J. Surdej
; J. Hanus
; L. Abe
; P. Antonini
; R.A. Artola
; M. Audejean
; R. Behrend
; F. Berski
; J.G. Bosch
; M. Bronikowska
; A. Carbognani
; F. Char
; M.-J. Kim
; Y.-J. Choi
; C.A. Colazo
; J. Coloma
; D. Coward
; R. Durkee
; O. Erece
; E. Forne
; P. Hickson
; R. Hirsch
; J. Horbowicz
; K. Kamiński
; P. Kankiewicz
; M. Kaplan
; T. Kwiatkowski
; I. Konstanciak
; A. Kruszewki
; V. Kudak
; F. Manzini
; H.-K. Moon
; A. Marciniak
; M. Murawiecka
; J. Nadolny
; W. Ogłoza
; J.L Ortiz
; D. Oszkiewicz
; H. Pallares
; N. Peixinho
; R. Poncy
; F. Reyes
; J.A. de los Reyes
; T. Santana-Ros
; K. Sobkowiak
; S. Pastor
; F. Pilcher
; M.C. Quiñones
; P. Trela
; D. Vernet
; | | Date: |
24 Jul 2017 | | Abstract: | Context. The so-called Barbarian asteroids share peculiar, but common
polarimetric properties, probably related to both their shape and composition.
They are named after (234) Barbara, the first on which such properties were
identified. As has been suggested, large scale topographic features could play
a role in the polarimetric response, if the shapes of Barbarians are
particularly irregular and present a variety of scattering/incidence angles.
This idea is supported by the shape of (234) Barbara, that appears to be deeply
excavated by wide concave areas revealed by photometry and stellar
occultations. Aims. With these motivations, we started an observation campaign
to characterise the shape and rotation properties of Small Main- Belt Asteroid
Spectroscopic Survey (SMASS) type L and Ld asteroids. As many of them show long
rotation periods, we activated a worldwide network of observers to obtain a
dense temporal coverage. Methods. We used light-curve inversion technique in
order to determine the sidereal rotation periods of 15 asteroids and the con-
vergence to a stable shape and pole coordinates for 8 of them. By using
available data from occultations, we are able to scale some shapes to an
absolute size. We also study the rotation periods of our sample looking for
confirmation of the suspected abundance of asteroids with long rotation
periods. Results. Our results show that the shape models of our sample do not
seem to have peculiar properties with respect to asteroids with similar size,
while an excess of slow rotators is most probably confirmed. | | Source: | arXiv, 1707.7503 | | Services: | Forum | Review | PDF | Favorites | |
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