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Spectral diversity and photometric behavior of main-belt and near-Earth vestoids and (4) Vesta: A study in preparation for the Dawn encounter

2014; Elsevier BV; Volume: 235; Linguagem: Inglês

10.1016/j.icarus.2013.11.011

1090-2643

Michael Hicks, B. J. Buratti, K. J. Lawrence, John K. Hillier, Jian‐Yang Li, V. Reddy, Stefan Schröder, A. Nathues, M. Hoffmann, L. Le Corre, R. Duffárd, Haibin Zhao, C. A. Raymond, C. T. Russell, T. Roatsch, R. Jaumann, H. Rhoades, D. Mayes, T. Barajas, Thien-Tin Truong, James Foster, A. McAuley,

Stellar, planetary, and galactic studies

In anticipation of the Dawn Mission to 4 Vesta, we conducted a ground-based campaign of Bessel BVRI filter photometry of five V-type near-Earth asteroids over a wide range of solar phase angles.We also obtained medium-resolution optical spectroscopy (0.38 lm < k < 0.92 lm; R $ 500) of sixteen near-Earth and mainbelt V-type asteroids in order to investigate their spectral diversity and to draw connections between spacecraft data of Vesta and V-type asteroids.Our disk-integrated photometry extended the excursion in solar phase angle beyond the maximum of 24°available from Earth for Vesta to 87°, which is more typical of the geometry during the Dawn approach and mapping phases.The majority of our broad-band observations were obtained at the JPL 0.6-m Table Mountain Observatory but multiple nights were also contributed by the Calar Alto 1.2-m and 2.2-m telescopes, as well as by the Purple Mountain 1-m Schmidt.Our results include a determination of rotation periods for 4 asteroids, identification of a binary candidate and four new V-type asteroids, including a confirmation of two main-belt V-type asteroids beyond the Jupiter 1:3 resonance (Cruikshank, D.